Dissertations / Theses: 'Precision Calculation'

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Xu, Qingjun. "Precision calculation for supersymmetric particle decays." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=98041332X.

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Iskrenova-Tchoukova, Eugeniya. "All-order approach to high-precision atomic calculation." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 144 p, 2008. http://proquest.umi.com/pqdweb?did=1601519371&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Throwe, William (William Thomas). "High precision calculation of generic extreme mass ratio inspirals." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61270.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 63-64).
Orbits around black holes evolve due to gravitational-wave emission, losing energy and angular momentum, and driving the orbiting body to slowly spiral into the black hole. Recent theoretical advances now make it possible to model the impact of this wave emission on generic (eccentric and inclined) black hole orbits, allowing us to push beyond the handful of constrained (circular or equatorial) cases that previous work considered. This thesis presents the first systematic study of how generic black hole orbits evolve due to gravitational-wave emission. In addition to extending the class of orbits which can be analyzed, we also introduce a new formalism for solving for the wave equation which describes radiative backreaction. This approach is based on a spectral decomposition of the radiation field originally introduced by Mano, Suzuki, and Takasugi (MST), and was then adapted for numerical analysis by Fujita and Tagoshi (FT). We find that the MST-FT formalism allows us to compute various quantities significantly more accurately than previous work, even in strong field regimes. We use this code to explore the location in orbital parameter space of the surface at which the evolution of orbital eccentricity changes sign from negative (orbits circularize) to positive (orbits become more eccentric).
by William Throwe.
S.B.

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Yuen, Ming Fatt. "Dilution of Precision (DOP) calculation for mission planning purposes." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/March/09Mar%5FYuen.pdf.

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Thesis (M.S. in Mechanical Engineering and M. S. in Applied Physics)--Naval Postgraduate School, March 2009.
Thesis Advisor(s): Driels, Morris R. ; Harkins, Richard M. "March 2009." Description based on title screen as viewed on April 24, 2009. Author(s) subject terms: GPS, DOP, JMEM, Delivery Accuracy. Includes bibliographical references (p. 200-201). Also available in print.

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Kurth, Thorsten [Verfasser]. "Precision Physics from the Lattice Calculation of the Hadron Spectrum, Quark Masses and Kaon Bag Parameter / Thorsten Kurth." Wuppertal : Universitätsbibliothek Wuppertal, 2011. http://d-nb.info/1018298673/34.

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Braathen, Johannes. "Automating Higgs precision calculations." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS073/document.

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L’étude des propriétés du boson de Higgs représente une excellente opportunité pour la recherche de Nouvelle Physique. En particulier, sa masse est mesurée avec une précision impressionnante, de l’ordre de 0.1%, tandis qu’elle est aussi prédite par certains modèles au-delà du Modèle Standard, notamment les modèles supersymétriques. Le but de cette thèse est de faire avancer le calcul des corrections radiatives aux masses des scalaires dans les modèles au-delà du Modèle Standard, ainsi que l’automatisation de ces calculs, afin d’établir ou d’améliorer les limites sur les couplages entre la Nouvelle Physique et le boson de Higgs. Nous calculons d’abord les corrections dominantes à deux boucles, de la forme O(alpha_s alpha_t), aux masses des scalaires neutres dans les modèles supersymétriques à jauginos de Dirac. Ensuite, nous montrons comment surmonter la Catastrophe des Bosons de Goldstone, un cas de divergences infrarouges dues aux bosons de Goldstones de masses nulles qui affecte les calculs de potentiels effectifs, d’équations « tadpoles » et d’énergies propres, en adoptant un schéma de renormalisation « on-shell » pour les masses des bosons de Goldstone. Nous illustrons la mise en œuvre numérique de notre solution dans le programme SARAH, et finalement, nous considérons le comportement aux hautes énergies de modèles non-supersymétriques avec des secteurs scalaires étendus
The Standard Model-like Higgs boson provides an excellent setting for the indirect search of New Physics, through the study of its properties. In particular its mass is now measured with an astonishing precision, of the order of 0.1%, while being predicted in some models of Beyond the Standard Model (BSM) Physics, such as supersymmetric (SUSY) models. The main purpose of this thesis is to push further the calculation of radiative corrections to Higgs boson masses in BSM models, as well as the automation of these calculations, in order to set or improve constraints on New Physics coupling to the Higgs boson. A first chapter is devoted to the computation of the leading two-loop O (alpha_s alpha_t) corrections to neutral scalar masses in SUSY models with Dirac gauginos. Then, we show to address the Goldstone Boson Catastrophe -- a case of infra-red divergences due to massless Goldstone bosons that plague the calculation of effective potentials, tadpole equations, and self-energies -- in the context of general renormalisable field theories, by adopting an on-shell renormalisation scheme for the Goldstone masses. Afterwards, we illustrate the numerical implementation of our solution to the Goldstone Boson Catastrophe in the public tool SARAH. Finally, in a last chapter, we consider the high-scale behaviour of non-supersymmetric models with extended Higgs sectors

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Coissard, Vincent. "Étude d'un cœur de processeur pour l'arithmétique exacte." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0089.

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L'arithmetique virgule flottante utilisee en machine pour le calcul scientifique introduit des erreurs dans le resultat des operations. Le calcul sur ordinateur porte en effet sur des operandes qui possedent un nombre limite de chiffres significatifs, lesquels ne representent qu'une approximation de la valeur exacte. Au fur et a mesure du deroulement des programmes, on assiste a une degradation progressive de la precision des nombres manipules. Ces accumulations d'erreurs peuvent conduire a des resultats invalides sans que l'utilisateur en soit averti. Parmi les solutions developpees pour maitriser les erreurs du calcul en machine, seule l'utilisation d'une arithmetique exacte conduit a un resultat dont on est sur qu'il est correct. Malheureusement cette solution est obtenue par logiciel au prix d'un temps de calcul extremement long. Une des principales raisons de la lenteur de ce type de logiciel provient du fait qu'ils s'executent sur des processeurs qui ne disposent pas d'une arithmetique adaptee au calcul exact. Il faut donc faire une emulation de chaque operation elementaire de l'arithmetique exacte en faisant appel a des routines logicielles utilisant les instructions disponibles sur le processeur. Cette emulation entraine alors une degradation des performances de l'arithmetique, et donc des logiciels, utilises pour le calcul exact. On propose de developper un coprocesseur qui realisera au niveau materiel toutes les operations elementaires de l'arithmetique exacte. L'architecture du circuit sera optimisee pour repondre aux specificites de cette arithmetique et plus particulierement pour calculer sur des nombres de grande taille. Afin d'augmenter encore les performances des logiciels, on integrera en materiel certaines fonctions usuelles du calcul exact

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Proudom, Josselin. "Supersymmetric phenomenology : polarized collisions and precision calculations." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY079/document.

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Les théories supersymétriques, telles que le Modèle Standard Supersymétrique Minimal, constituent des extensions très populaires du Modèle Standard de physique des particules, et sont activement recherchées au Large Hadron Collider (LHC). Dans cette thèse, nous nous concentrons sur deux aspects de la phénoménologie des théories supersymétriques aux collisionneurs hadroniques de haute-énergie, à savoir les collisions polarisées, et les calculs de précision. Dans un premier temps, nous réalisons une étude au Leading Order (LO), dans laquelle nous montrons comment la présence de faisceaux polarisés (longitudinalement) pourrait nous aider à différencier des modèles de Nouvelle Physique présentant la même signature à l'état final. A titre d'exemple, nous considérons le cas d'une classe particulière de scénarios, menant à la production de monotops, qui correspondent à la production d'un quark top en association avec de l'énergie transverse manquante. Nous présentons nos résultats pour un LHC polarisé à 14 TeV, et pour le récemment proposé Futur Collisionneur Circulaire (FCC), supposé opérer à 100 TeV. Par la suite, nous nous concentrons sur la réalisation de prédictions de précisions pour la production de paires de particules supersymétriques colorées au next-to-leading order (NLO) en QCD supersymétrique, avec ou sans violation non-minimale de saveur, et avec ou sans Parton Shower (PS). Plus particulièrement, nous fournissons les premiers résultats (préliminaires) pour la production de squark-antisquark au NLO en SUSY-QCD avec violation non-minimale de saveur, dans le cas d'un calcul à ordre perturbatif fixe, et considérons dans le contexte de modèles simplifiés la production par paires de particules colorées de type scalaire et Majorana au NLO avec PS
Supersymmetric theories, such as the Minimal Supersymmetric Standard Model (MSSM), constitute very popular extensions of the Standard Model of particle physics that are extensively searched for at the Large Hadron Collider (LHC). In this thesis, we focus on two specific aspects of the phenomenology of supersymmetric theories at high-energy hadron colliders, namely polarized collisions and precision calculations. First, we perform a Leading Order (LO) study, in which we show how the availability of (longitudinally) polarized proton beams could us help us to disentangle various Beyond the Standard Model (BSM) scenarios exhibiting the same final-state signature. For the sake of illustration, we focus on the case of one particular class of scenarios leading to monotop production, which corresponds to the production of a top quark in association with missing transverse energy. We present our results for a polarized LHC at 14 TeV, and for the recently proposed Future Circular Collider (FCC), supposed to operate at 100 TeV. Then, we concentrate on precise predictions for the pair production of coloured supersymmetric particles at next-to-leading order (NLO) in supersymmetric QCD, with or without Non-Minimal Flavour Violations (NMFV), and with or without matching those predictions with Parton Showers (PS). More specifically, we provide the first preliminary results for squark-antisquark pair production at NLO in SUSY-QCD with NMFV, in the case of a fixed order calculation, and consider in the context of simplified models the pair production of coloured scalar and coloured Majorana particles at NLO matched with PS

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Feige, Ilya Eric Alexander. "Factorization and Precision Calculations in Particle Physics." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467340.

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We state and prove to all orders in perturbation theory a factorization theorem in Quantum Chromodynamics that concisely describes the separation of the physics associated with jet formation from that associated with the hard-scattering in high-energy particle collisions. We show how the factorization theorem, which provides an equality between amplitudes in gauge theories, can be readily applied to precision calculations of cross-sections. In the resulting factorized cross sections, the components relevant to jet production are universal and perturbatively calculable. Their renormalization group evolution can be used to sum large logarithms of scale ratios to all orders in perturbation theory, thus enabling quantitive predictions in the regime of disparate scales relevant to many important collider-physics observables. As an application, we calculate the observable 2-subjettiness at next-to-next-to-next-to-leading-logarithmic order for the decay of boosted heavy color-singlet particles such as Electroweak bosons. Our calculation is the first analytic calculation of a jet substructure observable.
Physics

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Deutschmann, Nicolas. "Precision calculations in effective theories for Higgs production." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1142/document.

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Après une introduction générale, ce manuscrit contient deux chapitres préliminaires, l'un décrivant le contexte physique et l'autre les techniques mathématiques utilisées lors de cette thèse.Nous présentons ensuite les travaux développés au cours de cette thèse. Nous commençons par l'extraction de la correction du couplage de Yukawa du quark bottom dans la théorie effective du boson de Higgs par un calcul de correspondance à deux boucles entre cette théorie effective et le modèle standard. Cette correction était la pièce manquante pour l'amélioration de la prédiction de la section efficace de production du boson de Higgs en association avec deux quarks bottom.Les deux chapitres suivants couvrent différents aspects du calcul de la correction au deuxième ordre de la section efficace de production d'un boson de Higgs par fusion de gluon dans la théorie effective du modèle standard. Nous présentons d'abord le calcul des corrections virtuelles de ce processus et exploitons la structure établie des divergences ultraviolettes à une boucle et des divergences infrarouges pour extraire un contre terme à deux boucles qui nous a permis de renormaliser l'amplitude, que nous avons ensuite prolongé analytiquement aux régions physiques.Nous combinons alors ce résultat avec le calcul automatique des corrections par émission réelles par le logiciel Madgraph5_aMC@NLO, qui a permis l'intégration de la section efficace. Nous présentons les résultats pour la section efficace totale et deux distributions de variables cinématiques et commentons l'impact des corrections radiatives sur ces prédictions
After a general introduction, this manuscript presents two preliminary chapters, describing first the physics context and the mathematical techniques used in this thesis.We then present the work performed in this thesis. We start with extraction of the power-suppressed of the Yukawa coupling of the bottom quark in the Higgs Effective Field Theory (HEFT) by a two-loop matching calculation between the Standard Model and the HEFT. This correction was the missing piece to improve the prediction of the production cross section of a Higgs boson in association to a pair of bottom quarks.The two next chapters present different aspects of the NLO corrections to Higgs boson production through gluon fusion in the standard model effective field theory. We first present the evaluation of the virtual corrections to this process and use the known one-loop ultraviolet and infrared divergence structure to extract a two-loop counterterm that allowed us to renormalize the amplitude, which we then analytically continued to the physical regions.We then combine this result with the automatic calculation of the real emission corrections in the program Madgraph5_aMC@NLO. The results are presented for the total cross section and differential distributions and comment on the effect of radiative corrections on these predictions

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Zhou, Jia. "Precision Calculations for Electroweak Physics at Hadron Colliders." Thesis, State University of New York at Buffalo, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10163882.

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Electroweak (EW) corrections can be enhanced at high energies due to the soft or collinear radiation of virtual and real W and Z bosons that result in Sudakov-like corrections of the form α_W^llogⁿ(Q²/M_V²), where α_W = α/(4πsin²&thetas;_W) and n ≤ 2l – 1. Here M_V denotes the W or Z boson mass, &thetas;_w the weak mixing angle and Q² a typical energy scale of the hard process under consideration. The inclusion of EW corrections in predictions for the CERN Large Hadron Collider (LHC) is therefore especially important when searching for signals of possible new physics in distributions probing the kinematic regime Q² » M_V². Next-to-leading order (NLO) EW corrections should also be taken into account when their size (O(α)) is comparable to that of QCD corrections at next-to-next-to-leading order (NNLO) (O(α_s²)). To this end we have calculated and implemented in the parton-level Monte-Carlo program MCFM the NLO weak corrections to three key processes at the LHC: the Neutral-Current Drell-Yan process, top-quark pair production and di-jet production. This enables a study of their effects on LHC observables combined with the already available QCD corrections at NLO and NNLO. We provide both the full NLO weak corrections and their Sudakov approximation, since the latter is often used for a fast evaluation of weak effects at high energies and can be extended to higher orders. With both the exact and approximate results at hand, the validity of the Sudakov approximation can be readily quantified. In the case of top-quark pair production at the LHC we also calculated the NLO QED corrections.

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Раус, Сергій Сергійович. "Дослідження механізму затиску верстата для обробки кілець кулькових підшипників." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30977.

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Магістерська дисертація на тему: ”Дослідження механізму затиску верстата для обробки кулькових підшипників” Дисертація складається з вступу, 3 розділів, висновків, списку літератури. Текст записки складається з 77 сторінок, яка включає в себе 52 рисунків та 14 таблиць. Розроблений самоцентруючий розтискний патрон для обробки кілець підшипника з базуванням по внутрішній сферичній поверхні на двошпиндельном верстаті з ЧПК. Розроблен захват для зміни заготовки між шпинделями, який підвищує продуктивність обробки при багатосерійному виробництві. Був здійснений аналіз напружень в найбільш відповідальних деталях затискного патрона.
Master's thesis on the topic: "Study of the clamping mechanism of the machine for processing ball bearings” The thesis consists of an introduction, 3 sections, conclusions, references. The text of the note consists of 77 pages, which includes 52 figures and 14 tables. A self-centering expansion Chuck has been developed for processing bearing rings based on the inner spherical surface on a duplex CNC machine. Designed capture for changing the workpiece between the spindles, which increases the processing performance in large-scale production. Stress analysis was carried out in the most critical parts of the clamping Chuck.
Магистерская диссертация на тему: ”Исследование механизма зажима станка для обработки шариковых подшипников” Диссертация состоит из вступления, 3 разделов, выводов, списка литературы. Текст записки состоит из 77 страниц, которая включает в себя 52 рисунков и 14 таблиц. Разработан самоцентрирующий разжимной патрон для обработки колец подшипника с базированием по внутренней сферической поверхности на двухшпиндельном станке с ЧПУ. Разработан захват для смены заготовки между шпинделями, который повышает производительность обработки при крупносерийном производстве. Был осуществлен анализ напряжений в наиболее ответственных деталях зажимного патрона.

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Slavich, P. "Precision calculations in supersymmetric extensions of the Standard Model." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00824019.

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Reuschle, Christian Andreas [Verfasser]. "Numerical precision calculations for LHC physics / Christian Andreas Reuschle." Mainz : Universitätsbibliothek Mainz, 2013. http://d-nb.info/1032971843/34.

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Nickel, Kilian [Verfasser]. "Precision Calculations in Supersymmetric Models using Phenomenological Tools / Kilian Nickel." Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/1124540156/34.

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Wlotzka, Alexander [Verfasser], and M. [Akademischer Betreuer] Mühlleitner. "Precision Calculations in New Physics Models / Alexander Wlotzka ; Betreuer: M. Mühlleitner." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1133171842/34.

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Karlberg, Alexander. "At the frontier of precision QCD in the LHC era." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:73cc8cf7-da8b-4845-b015-be0313ae0493.

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This thesis discusses recent advances in precision calculations of quantum chromodynamics and their application to the Large Hadron Collider (LHC) physics program and beyond. The first half of the thesis is dedicated to the study of vector boson fusion Higgs (VBF) production; fully differential at the next-to-next-to-leading order level (NNLO), and inclusively at next-to-next-to-next-to-leading order (N³LO). Both calculations are performed in the structure function approximation, where the VBF process is treated as a double deep inelastic scattering. For the differential calculation a new subtraction method, "projection-to-Born", is introduced and applied. We study VBF production in a number of scenarios relevant for the LHC and for Future Circular Colliders (FCC). We find NNLO corrections after typical cuts of 5-6% while differential distributions show corrections of up to 10-12% for some standard observables. For the inclusive calculation we find N³LO corrections at the order of 1-2‰. The second half of the thesis presents recent results on the matching of fixed order calculations with parton showers. We first present the POsitive Weight Hardest Emission Generator (POWHEG) method for matching next-to-leading order (NLO) calculations with parton showers. We then proceed to apply it to the case of vector boson fusion ZZjj production and discuss the results for scenarios relevant for the LHC and a possible FCC. In order to present the matching of a NNLO calculation with a parton shower, we next discuss the Multi-Scale Improved NLO (MiNLO) procedure. By applying a reweighting procedure to MiNLO improved Drell-Yan production, we obtain a generator which is NNLO accurate when integrated over all radiation while providing a fully exclusive description of the final state phase space. We compare the calculation to dedicated next-to-next-to-leading logarithm resummations and find very good agreement. The generator is also found to be in good agreement with 7 and 8 TeV LHC data.

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Fickinger, Michael. "Applications of Effective Field Theories for Precision Calculations at e⁺e⁻ Colliders." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/241973.

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Effective field theories can be used to describe measurements at e⁺e⁻ colliders over a wide kinematic range while allowing reliable error predictions and systematic extensions. We show this in two physical situations. First, we give a factorization formula for the e⁺e⁻ thrust distribution dσ/dτ with thrust T and τ = 1 − T based on soft collinear effective theory. The result is applicable for all τ, i.e. in the peak, tail, and far-tail regions. We present a global analysis of all available thrust distribution data measured at center-of-mass energies Q = 35 to 207 GeV in the tail region, where a two parameter fit to the strong coupling constant α(s)(m(Z)) and the leading power correction parameter Ω₁ suffices. We find α(s)(m(Z)) = 0.1135 ± (0.0002)expt ± (0.0005)hadr ± (0.0009)pert, with x²/dof = 0.91, where the displayed 1-sigma errors are the total experimental error, the hadronization uncertainty, and the perturbative theory uncertainty, respectively. In addition, we consider cumulants of the thrust distribution using predictions of the full spectrum for thrust. From a global fit to the first thrust moment we extract α(s)(m(Z)) and Ω₁. We obtain α(s)(m(Z)) = 0.1140 ± (0.0004)exp ± (0.0013)hadr ± (0.0007)pert which is compatible with the value from our tail region fit. The n-th thrust cumulants for n ≥ 2 are completely insensitive to Ω₁, and therefore a good instrument for extracting information on higher order power corrections, Ω'(n)/Qⁿ, from moment data. We find (˜Ω₂)^1/2 = 0.74 ± (0.11)exp ± (0.09)pert GeV. Second, we study the differential cross section dσ/dx of e⁺e⁻-collisions producing a heavy hadron with energy fraction x of the beam energy in the center-of-mass frame. Using a sequence of effective field theories we give a definition of the heavy quark fragmentation function in the endpoint region x → 1. From the perspective of our effective field theory approach we revisit the heavy quark fragmentation function away from the endpoint and outline how to develop a description of the heavy quark fragmentation function valid for all x. Our analysis is focused on Z-boson decays producing one B-meson. Finally, we will give a short outlook of how we want to apply our approach to determine the leading nonperturbative power corrections of the b-quark fragmentation function from LEP experiments.

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Hoferichter, Martin [Verfasser]. "Precision calculations for the low-energy dynamics of pions and nucleons / Martin Hoferichter." Bonn : Universitäts- und Landesbibliothek Bonn, 2012. http://d-nb.info/1044081163/34.

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Pellen, Mathieu [Verfasser], Michael [Akademischer Betreuer] Krämer, and Margarete [Akademischer Betreuer] Muhlleitner. "Precision calculations for physics beyond the standard model / Mathieu Pellen ; Michael Krämer, Margarete Muhlleitner." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1129261646/34.

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Kesenheimer, Matthias [Verfasser], and Barbara [Akademischer Betreuer] Jäger. "Precision Calculations for Weakino-Pair Production at Hadron Colliders / Matthias Kesenheimer ; Betreuer: Barbara Jäger." Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/1168729467/34.

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Kallweit, Stefan. "Precision calculations for Gauge-Boson pair production with a hadronic jet at Hadron colliders." Diss., kostenfrei, 2008. http://edoc.ub.uni-muenchen.de/9362/.

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Lim, Matthew Alexander. "Quantum chromodynamics and the precision phenomenology of heavy quarks." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/285109.

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In this thesis we consider the phenomenology of the theory of strong interactions, Quantum Chromodynamics (QCD), with particular reference to the ongoing experimental program at the Large Hadron Collider in CERN. The current progress in precision measurement of Standard Model processes at the LHC experiments must be matched with corresponding precision in theoretical predictions, and to this end we present calculations at next-to-next-to-leading order in perturbation theory of observable quantities involving quarks and gluons, the strongly interacting particles of the SM. Such calculations form the most important class of corrections to observables and are vital if we are to untangle signals of New Physics from LHC data. We consider in particular the amplitudes for five parton interactions at 1- and 2-loop order and present full (in the 1-loop case) and partial (in the 2-loop case) analytic results in terms of rational functions of kinematic invariants multiplying a basis of master integrals. We address the problem of the solution of a system of integration-by-parts identities for Feynman integrals and demonstrate how some current difficulties may be overcome. We consider also the properties of the top quark, and present the NNLO, real-virtual contributions to the calculation of its decay rate. The results are presented as helicity amplitudes so that the full behaviour of the top spin is retained. These amplitudes constitute a necessary ingredient in the complete calculation of top quark pair production and decay at NNLO which will be an important theoretical input to many experimental analyses. Turning to a more phenomenological study, we consider the extraction of two important SM parameters, the top mass and the strong coupling constant, from measurements of top pair production at the ATLAS and CMS experiments. We compare with NNLO theory predictions and use a least-squares method to extract the values of the parameters simultaneously. We find best fit values of the parameters which are compatible with previous extractions performed using top data with the current world averages published by the Particle Data Group. We consider the issue of PDF choice and the circumstances in which a heavy quark can be considered a constituent of the proton. In particular, we look at the production of a Higgs boson in association with bottom quarks in four and five flavour schemes, in which the b may or may not be included in the initial state. We show that theoretical predictions in both schemes are well-motivated and appropriate in different scenarios, and moreover that results in the schemes are consistent provided a judicious choice of the renormalisation and factorisation scales is made. We suggest a typical scale choice motivated by considerations of consistency and find it to be somewhat lower than the typical hard scale of the process.

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Volotka, Andrey V. "High-precision QED calculations of the hyperfine structure in hydrogen and transition rates in multicharged ions." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1164063385430-72550.

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Studies of the hyperfine splitting in hydrogen are strongly motivated by the level of accuracy achieved in recent atomic physics experiments, which yield finally model-independent informations about nuclear structure parameters with utmost precision. Considering the current status of the determination of corrections to the hyperfine splitting of the ground state in hydrogen, this thesis provides further improved calculations by taking into account the most recent value for the proton charge radius. Comparing theoretical and experimental data of the hyperfine splitting in hydrogen the proton-size contribution is extracted and a relativistic formula for this contribution is derived in terms of moments of the nuclear charge and magnetization distributions. An iterative scheme for the determination of the Zemach and magnetic radii of the proton is proposed. As a result, the Zemach and magnetic radii are determined and the values are compared with the corresponding ones deduced from data obtained in electron-proton scattering experiments. The extraction of the Zemach radius from a rescaled difference between the hyperfine splitting in hydrogen and in muonium is considered as well. Investigations of forbidden radiative transitions in few-electron ions within ab initio QED provide a most sensitive tool for probing the influence of relativistic electron-correlation and QED corrections to the transition rates. Accordingly, a major part of this thesis is devoted to detailed studies of radiative and interelectronic-interaction effects to the transition probabilities. The renormalized expressions for the corresponding corrections in one- and two-electron ions as well as for ions with one electron over closed shells are derived employing the two-time Green's function method. Numerical results for the correlation corrections to magnetic transition rates in He-like ions are presented. For the first time also the frequency-dependent contribution is calculated, which has to be accounted for preserving gauge invariance. One-loop QED corrections to the magnetic-dipole transition amplitude between the fine-structure levels 2p_{3/2} and 2p_{1/2} are calculated to all orders in \alpha Z. Taking into account consistently relativistic, interelectronic-interaction, and QED corrections to the magnetic-dipole transition amplitude allows for predictions of the lifetimes of the states (1s^2 2s^2 2p)^2P_{3/2} in B-like ions and (1s^2 2s 2p)^3P_2 in Be-like ions with utmost precision. The results of corresponding calculations are compared with experimental data obtained in recent measurements at the Heidelberg EBIT. Finally, for He-like ions with nonzero-spin nuclei the effect of hyperfine quenching on the lifetimes of the 2^3P_{0,2} states is investigated and again compared available experimental data.

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Bredenstein, Axel. "Precision calculations for gamma gamma -> 4 fermions and H -> WW/ZZ -> 4 fermions." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-52794.

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Neumann, Tobias [Verfasser]. "Perturbative calculations for Standard Model precision physics: Higgs production and Yang-Mills gradient flow / Tobias Neumann." Wuppertal : Universitätsbibliothek Wuppertal, 2015. http://d-nb.info/1078321795/34.

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Capozi, Matteo [Verfasser], and Gerhard [Akademischer Betreuer] Buchalla. "Precision calculations in the Higgs sector within and beyond the Standard Model / Matteo Capozi ; Betreuer: Gerhard Buchalla." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1222436612/34.

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Pardo, Vega Javier. "Higgs mass and QCD axion properties at high precision." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4902.

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This thesis is dedicated to study the physical properties at high precision of two scalars of well-motivated beyond the standard model theories: the Higgs boson in the Minimal Supersymmetric Standard Model (MSSM) and the axion of the Peccei-Quinn mechanism. The discussion is divided in two parts. We make use of the advantages of the effective field theory framework. In the first part, we consider the state-of-the-art of the effective field theory computation of the MSSM Higgs mass, improving the existing ones by including extra threshold corrections. We perform a detailed estimate of the theoretical uncertainty. We study the large tangent beta region and we put emphasis on the allowed parameter space reproducing the experimental value of the Higgs mass. We present SusyHD, a fast computer code that computes the Higgs mass and its uncertainty for any supersymmetry (SUSY) scale, from the TeV to the Planck scale, even in Split SUSY, both in the DRbar and in the on-shell (OS) schemes. Finally, we apply our results to derive bounds on some well motivated SUSY models, in particular we show how the value of the Higgs mass allows to determine the complete spectrum in minimal gauge mediation. In the second part, we discuss how to extract several properties of the axion of Quantum Chromodynamics (QCD) with great accuracy using only first principle QCD computations. We obtained the axion potential, the mass and the coupling to photons by combining next to leading order (NLO) calculations in chiral perturbation theory (ChPT) with recent Lattice QCD results. Axion-nucleon interactions are also derived reliably. The method we have followed allows to further improve the precision as uncertainties on the light quark masses and the effective field theory couplings are reduced. We have also studied the finite temperature dependence of the axion potential and its mass, in connection with its role in determining the axion relic abundance.

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Klappert, Jonas [Verfasser], Robert V. [Akademischer Betreuer] Harlander, and Michael [Akademischer Betreuer] Krämer. "Precision calculations for Higgs physics in the standard model and beyond / Jonas Klappert ; Robert V. Harlander, Michael Krämer." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1217257098/34.

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Bilal, Moazzam [Verfasser], Stephan [Gutachter] Fritzsche, Andrey [Gutachter] Surzhykov, and Zoltán [Gutachter] Harman. "High precision many-electron calculations for multiply-charged ions / Moazzam Bilal ; Gutachter: Stephan Fritzsche, Andrey Surzhykov, Zoltán Harman." Jena : Friedrich-Schiller-Universität Jena, 2019. http://d-nb.info/1207155969/34.

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Klappert, Jonas Verfasser], Robert V. [Akademischer Betreuer] [Harlander, and Michael [Akademischer Betreuer] Krämer. "Precision calculations for Higgs physics in the standard model and beyond / Jonas Klappert ; Robert V. Harlander, Michael Krämer." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1217257098/34.

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Herren, Florian [Verfasser], and M. [Akademischer Betreuer] Steinhauser. "Precision Calculations for Higgs Boson Physics at the LHC - Four-Loop Corrections to Gluon-Fusion Processes and Higgs Boson Pair-Production at NNLO / Florian Herren ; Betreuer: M. Steinhauser." Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1221186914/34.

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Jamal, Fernando Galvanin. "Avaliação da precisão da declividade da técnica de perfuração direcional horizontal para instalações de redes de esgoto." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-10102008-091541/.

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O presente trabalho está focado no método de perfuração direcional horizontal (HDD) para instalação de redes de esgoto gravitacional. Descrevem-se os resultados de diferentes técnicas com o objetivo de se atingir a exigência de declividade. Para tanto foram executados 4 furos experimentais simulando trechos daquelas redes, com extensão de 30 m e tubulação de PEAD com diâmetro externo de 125 mm. Estas instalações foram executadas na cidade de São Carlos, Brasil, em um solo classificado granulometricamente como uma areia argilosa. Para cada uma das 4 instalações, adotou-se um processo construtivo diferenciado. Esta diferenciação se deu a partir do diâmetro do alargador adotado, do número de passadas do mesmo e da execução de furos verticais para alívio de pressão no espaço anelar assim como medidas diretas de profundidade do furo piloto. Após a instalação dos dutos foram realizadas medidas altimétricas no interior dos mesmos possibilitando avaliar quantitativamente os resultados obtidos. Estes resultados indicam que ainda é necessário refinar a técnica de perfuração direcional para a execução das redes de esgoto. Entretanto é possível observar que as variações empregadas na execução de cada um dos furos conduzem a um caminho de melhoria nos resultados obtidos. Esta melhoria pode ser observada nos furos onde o alargador adotado apresentava menor diâmetro conduzindo a menores desvios na posição final do duto. Salientam-se também os benéficos resultados da execução dos furos verticais que conduziram a menores pressões no espaço anelar assim como possibilitaram medidas altimétricas diretas da posição do furo piloto. Desta forma, é provável que com um maior número de experimentos e incrementos tecnológicos se atinja o objetivo final, ou seja, executar redes de esgoto gravitacional com declividade constante e baixa. Em paralelo nas instalações executadas foram realizados testes para avaliação da precisão e acurácia do sistema de navegação responsável pelo fornecimento de informações de posição e temperatura da ferramenta de corte durante a execução do furo piloto. Este trabalho contempla ainda, a elaboração de uma nova solução para as instalações de esgoto executadas através do HDD. Esta solução propõe a aplicação de um esforço de tração a um elemento externo, uma geogrelha que envolve a tubulação, visando posicionar a mesma em declividade constante. Face a seu caráter inovador foram desenvolvidos equipamentos e procedimentos de ensaio de laboratório, para avaliar a aplicabilidade da solução na prática
The present work is focused on the horizontal directional drilling (HDD) method to install gravity sewers. The results of different techniques are described intending to meet the demands of gradient. Therefore, 4 experimental pilot bores were drilled simulating a section of those structures extending 30 m with HDPE pipelines of 125 mm external diameter. Those installations were engineered in the city of São Carlos, Brazil, in a clayey sand. For each of the 4 installations a distinct constructive process was adopted. Such characteristic was on account of the diameter of the selected reamer, the number of reamer steps and the vertical drills performed to relieve the pressure in the annular space, as well as the direct depth measurements of the pilot hole. After installing the pipes, altimetric measurements were performed inside them, hence enabling to quantitatively assess the obtained results. These results indicate the need to further refine the directional drilling technique for sanitary sewers. Yet it can be seen that the employed variations for each of the holes lead to an improved course of action with the observed results. Such improvement is perceived in the holes where the selected reamer had a smaller diameter, hence allowing for less displacement in the pipes final position. Also emphasized are the resulting benefits of the vertical drills that lead to less pressure in the annular space, as well as enabling altimetric measurements of the pilot hole position. Thus, it is presumed that with further experiments and technological developments the final objective is reached, meaning, putting into effect constant and low level gradient sewer networks. Tests for precision and accuracy assessment of the tracking system were also performed in each tube installed. The tracking system is responsible for providing information related to position and temperature of the drill head during the drilling operation. The steps for the development of a new HDD solution for sewer installation are presented. The idea is based on the application of a tensile force to an element external to the product, aiming at attaining a constant gradient. Equipments and procedures developed for this new technique are described.

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Bizouard, Vincent. "Calculs de précision dans un modèle supersymétrique non minimal." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY075/document.

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Malgré les nombreux succès du Modèle Standard de la physique des particules, plusieurs éléments montrent qu'il ne s'agit que d'une théorie effective à basse énergie. En effet, la masse des neutrinos et la matière noire ne sont pas expliqués dans ce modèle, qui ne prend pas en compte non plus la gravitation dont la version quantique n'a toujours pas été établie. De plus, les divergences quadratiques des corrections à la masse du boson de Higgs dans ce modèle pose un problème de naturalité. Tous ces problèmes indiquent la nécessité de trouver une nouvelle physique, qui doit être décrite par une extension du Modèle Standard. Une des possibilités est d'ajouter une nouvelle symétrie de l'espace-temps, la Supersymétrie, reliant les bosons et le fermions. Dans son extension miminale, la Supersymétrie permet déjà de résoudre le problème de la matière noire en proposant un candidat naturel, le neutralino, et de supprimer les dangereuses corrections quadratiques à la masse du boson de Higgs.Dans cette thèse, les travaux se sont concentrés sur une extension supersymétrique non minimale du Modèle Standard, le NMSSM. Afin de confronter la théorie aux expériences, il est nécessaire de calculer précisément les différentes observables. Ces calculs étant complexes, il est naturel de les automatiser, ce qui a été réalisé à l'aide du code SloopS. Avec ce code, nous avons pu dans un premier temps nous intéresser à la désintégration du boson de Higgs en un photon et un boson Z. Ce mode de désintégration a la particularité d'être généré directement à une boucle, ce qui le rend sensible à la présence de nouvelles particules. Il a commencé à être mesuré lors du Run 1 du LHC et les données vont continuer à s'accumuler avec le Run actuel (Run 2). La possibilité d'une déviation du signal mesuré avec celui prédit par le modèle Standard, requiert donc une analyse théorique préliminaire, que nous avons effectué dans le cadre du NMSSM. Nous nous sommes ensuite intéressé aux corrections radiatives pour des processus plus généraux.Il a d'abord fallu réaliser et implémenter la renormalisation dans SloopS afin de réguler les divergences apparaissant dans ces calculs à une boucle. Puis nous avons pu utiliser le modèle renormalisé pour calculer les corrections radiatives aux masses et largeurs de désintégration des différentes particules supersymétriques et des bosons de Higgs, en comparant les résultats obtenus dans différents schémas de renormalisation
Although the Standard Model has been very successful so far, it presents several limitations showing that it is only an effective low energy theory. For example, the neutrino masses or dark matter are not predicted in this model. Gravity is also not taken into account and we expect that it plays a quantum role at energies around the Planck mass. Moreover, radiative corrections to the Higgs boson mass suffer from quadratic divergences. All these problems underline the fact that new physics should appear, and this has to be described by an extension of the Standard Model. One well-motivated possibility is to add a new space-time symetry, called Supersymmetry, which link bosons and fermions. In its minimal extension, Supersymmetry can already solve the dark matter paradox with a natural candidate, the neutralino, and provide a cancellation of the dangerous quadratic corrections to the Higgs boson mass.In this thesis, we focussed on the Next-to-Minimal SuperSymmetric extension of the Standard Model, the NMSSM. To compare theoretical predictions with experiments, physical observables must be computed precisely. Since these calculations are long and complex, automatisation is desirable. This was done by developping SloopS, a program to compute one-loop decay width and cross-section at one-loop order in Supersymmetry. With this code, we first analysed the decay of the Higgs boson in a photon and a Z boson. This decay mode is induced at the quantum level and thus is an interesting probe of new physics. Its measurement has been started during Run 1 of the LHC and is continued now in Run 2. The possibility of deviation between the measured signal strength and the one predicted by the Standard Model motivates a careful theoretical analysis in beyond Standard Models which we realised within the NMSSM. Our goal was to compute radiative corrections for any process in this model. To cancel the ultraviolet divergences appearing in higher order computations, we had to carry out and implement the renormalisation of the NMSSM in SloopS. Finally, it was possible to use the renormalised model to compute radiatives corrections to masses and decay widths of Higgs bosons and supersymmetric particles in the NMSSM and to compare the results between different renormalisation schemes

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ABDALLAH, HAISCAM. "Construction d'un logiciel de calcul des elements transitoires de chaines de markov a temps continu." Rennes 1, 1989. http://www.theses.fr/1989REN10055.

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Developpement d'une methode et construction d'un logiciel permettant l'evaluation quantitative des mesures de la surete de fonctionnement des systemes informatiques. La methode proposee realise un calcul precis et rapide des elements transitoires. Des bornes relatives aux differentes erreurs sont mises en evidence. Plus precisement, elles concernent le probleme de precision relatif a la troncature et celui des erreurs d'arrondi. Des valeurs critiques, a partir desquelles les resultats avec un chiffre decimal significatif ne sont plus garantis, sont definies. Cette definition a permis le calcul de l'ensemble de la reponse transitoire par une seule execution du logiciel elabore

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36

Xu, Qingjun [Verfasser]. "Precision calculation for supersymmetric particle decays / Qingjun Xu." 2006. http://d-nb.info/98041332X/34.

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Fidanyan, K. S., and V. V. Stegailov. "Calculation of the vacancy diffusion rate: beyond the NEB precision." 2017. https://ul.qucosa.de/id/qucosa%3A31660.

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Yin, Hantao. "Precision Lattice Calculation of Kaon Decays with Möbius Domain Wall Fermions." Thesis, 2013. https://doi.org/10.7916/D8RR25F3.

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We report our recent development in algorithms and progress in measurements in lattice QCD. The algorithmic development includes the forecasted force gradient integrator, and further theoretical development and implementation of the Möbius domain wall fermions. These new technologies make it practical to simulate large 48^3*96 and 64^3*128 lattice ensembles with (5.5fm)^3 boxes and 140MeV pion. The calculation was performed using the Möbius domain wall fermions and the Iwasaki gauge action. Simulated directly at physical quark masses, these ensembles are of great value for our ongoing and future lattice measurement projects.With the help of measurement techniques such as the eigCG algorithm and the all mode averaging method, we perform a direct, precise lattice calculation of the semileptonic kaon decay K→πlν using these newly generated high quality lattice ensembles. Our main result is the form factor f^+_{Kπ}(q^2) evaluated directly at zero momentum transfer q^2=0. Free of various systematic errors, this new result can be used to determine the CKM matrix element Vus to a very high precision when combined with experimental input. The calculation also provides results for various low energy strong interaction constants such as the pseudoscalar decay constants f_K and f_π, and the neutral kaon mixing matrix element B_K. These calculations are naturally performed by reusing the propagators calculated for the kaon semileptonic decay mentioned above. So they come with no or very low additional cost. The results allow us to also determine these important low energy constants on the lattice to unprecedented accuracy.

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Banik, Sumit. "On Hypergeometric solutions of Feynman integrals using Mellin-Barnes Integrals with Applications." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5948.

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Experimental measurements of physical observables in particle colliders rely on high-precision theoretical calculations to validate the predictions of any theoretical model and detect signals of new physics. These theoretical calculations, in the perturbative framework of quantum field theory, require the computation of complicated integrals, commonly known as Feynman integrals. Therefore, the evaluation of Feynman integrals is the backbone of theoretical precision calculations. However, this is a highly non-trivial task as we go to higher order in the perturbative series expansion, where the number of scales and loops of the associated Feynman diagrams become large, and the number of Feynman diagrams grows factorially. Nevertheless, such computations are necessary to match the extraordinary precision level of modern and future colliders, and thus the study of Feynman integrals has become a very active field of research in recent years. In this thesis, we focus on studying the mathematical aspects of Feynman integrals and devise techniques to compute them. This field of research is at the cutting edge of theoretical physics, mathematics and computer programming, with new efficient tools proposed every year. Some of the well-known techniques to compute Feynman integrals include the method of differential equations, Mellin-Barnes (MB) representation, hypergeometric functions, Gelfand-Kapranov-Zelevinsky (GKZ) system of equations etc. Our primary focus in this thesis is the study of the Mellin-Barnes (MB) representation approach to solving Feynman integrals in terms of hypergeometric functions. In one of the projects reported in this thesis, we present the first systematic computational technique to solve N-fold MB integrals commonly appearing in the context of Feynman integrals. This technique is based on a surprising geometrical connection between MB integrals and the theory of conic hulls, and therefore we call this the conic hull method. This method yields the final solution in terms of hypergeometric series, which are useful for further analytic study as well as numerical computation. Along with this project, we also present a computer implementation of the conic hull method in the form of the package MBConicHulls.wl based on Mathematica. In another project in this thesis, we apply the conic hull method to solve the previously unsolved dual-conformal hexagon and double box Feynman integrals. These integrals remained unsolved as they involve solving a nine-fold MB integral. However, the conic hull method is successful in solving both the above integrals as it is applicable to N-fold MB integrals. The solutions we obtain for the hexagon and double box are cross-checked numerically against direct integration of Feynman parametrization and analytically using the differential equation satisfied by the double box and hexagon integrals. In another project, we show yet another application of the conic hull method by computing one-loop N-point massive conformal Feynman integrals. Here, we prove two conjectures, first proposed from the Yangian bootstrap approach, stating that any one-loop N-point massive conformal Feynman integral can be written as a single multi-fold hypergeometric series. To prove this, we show that there is always a conic hull, associated with the MB integral of the Feynman integrals, which does not intersect with any other conic hulls, and therefore yields a series solution with a single hypergeometric series. Finally, in the last project of this thesis, we use the conic hull method to illustrate the limitations of the method of brackets. The latter is a computational technique based on the Ramanujan Master Theorem, and was devised originally to evaluate Feynman integrals but is also useful to evaluate certain definite integrals. However, the method is plagued with divergences whose origin is not from the ultraviolet divergence of the Feynman integral, but from the breakdown of one of the rules of the method of brackets. Studying this method in parallel with the conic hull method helps us show some of the fundamental issues of the method of brackets and point out the domain of validity of the method.
Ministry of Human Resource Development (MHRD), Government of India

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Zhang, Jianhui [Verfasser]. "Precision calculations for the decay of Higgs bosons in the MSSM / Jianhui Zhang." 2009. http://d-nb.info/993391265/34.

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Turczyk, Sascha S. [Verfasser]. "Testing the standard model with precision calculations of semileptonic B-decays / vorgelegt von Sascha S. Turczyk." 2010. http://d-nb.info/1013087356/34.

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Bredenstein, Axel [Verfasser]. "Precision calculations for γγ [gamma-gamma] → 4-fermions and H → WW/ZZ → 4-fermions / vorgelegt von Axel Bredenstein." 2006. http://d-nb.info/979932475/34.

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Kallweit, S. [Verfasser]. "Precision calculations for gauge-boson pair production with a hadronic jet at hadron colliders / vorgelegt von Stefan Kallweit." 2008. http://d-nb.info/991829859/34.

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Volotka, Andrey V. [Verfasser]. "High-precision QED calculations of the hyperfine structure in hydrogen and transition rates in multicharged ions / vorgelegt von Andrey V. Volotka." 2006. http://d-nb.info/982398115/34.

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Pont, Federico Manuel. "Sistemas de pocos cuerpos en un entorno del umbral del continuo :." Doctoral thesis, 2010. http://hdl.handle.net/11086/139.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2010.
En esta tesis se presenta un estudio de varios sistemas cuánticos cuyo común denominador es que poseen uno o más estados ligados cerca del umbral de energía del continuo. En este aspecto se analizaron los diagramas de estabilidad de varios sistemas de dos y tres partículas ligadas por diferentes potenciales centrales, tanto externos como de interacción entre partículas, determinando las zonas en que los sistemas son capaces de ligar tres, dos, una, o ninguna partícula. Se demuestra mediante cálculos variacionales de alta precisión que algunos sistemas de partículas cargadas inmersas en plasmas, en la aproximación de Debye-Hueckel, presentan Efecto Efimov y enlace Borromeano ( capaces de ligar tres partículas pero no dos). Se analizaron también sistemas con estados ligados cuya energía cruza el umbral del continuo al variar los parámetros del Hamiltoniano.
Federico Manuel Pont.

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Dissertations / Theses on the topic 'Precision Calculation'

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