Дисертації з теми "HisGs"
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Hamada, Yuta. "Higgs potential and naturalness after the Higgs discovery." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215312.
Повний текст джерелаGu, Jiayin, Honglei Li, Zhen Liu, Shufang Su, and Wei Su. "Learning from Higgs physics at future Higgs factories." SPRINGER, 2017. http://hdl.handle.net/10150/626569.
Повний текст джерелаSchildt, Erik. "Higgs inflation." Thesis, Uppsala universitet, Teoretisk fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355063.
Повний текст джерелаI detta projekt undersöker vi en modell av kosmisk inflation där Higgsfältet med en ickeminimal koppling till tyngdkraften är mekanismen bakom inflation. Vi utför en klassisk analys och beräknar modellens föresägelser för ett antal kosmologiska parametrar som jämförs med Planck experimentet. Vi uppskattar värdet på den ickeminimala kopplingen $\xi$ och finner att $\xi \sim 10^4$. De grundläggande aspekterna bakom kvantanalysen samt vad effekten av den ickeminimala kopplingen har på beskrivningen i termer av en effektiv fältteori diskuteras. Vi finner att en klassisk analys ger förutsägelser som passar väl med Planckexperimentet men att den ickeminimala kopplingen leder till unitaritetsproblem för denna modell av inflation. Kvanteffekter kan dock ha en avsevärd effekt på resultat och en utförlig analys som tar dem till hänsyn krävs för att avgöra om Higgsinflation är en möjlig modell för inflation.
Kling, Felix, and Felix Kling. "Exotic Higgs Decays." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/620861.
Повний текст джерелаAkeroyd, Andrew Gerard. "Signals of non-minimal Higgs sectors at future colliders." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5288/.
Повний текст джерелаLowe, A. P. "Lattice gauge-Higgs theories." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378268.
Повний текст джерелаYou, Tiann-Tevong. "Characterising the Higgs Boson." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/characterising-the-higgs-boson(1ca43424-ea36-4bc6-be29-ac9e306249fe).html.
Повний текст джерелаBlaavand, Jakob Lindblad. "The Dirac-Higgs bundle." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:6e081810-f042-4b3e-9f7c-9eee3c930c35.
Повний текст джерелаBraathen, Johannes. "Automating Higgs precision calculations." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS073/document.
Повний текст джерелаThe 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
Kallarackal, Jim. "The Higgs boson resonance from a chiral Higgs-Yukawa model on the lattice." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16332.
Повний текст джерелаThe Higgs boson is a central part of the electroweak theory and is crucial to generate masses for fermions and the weak gauge bosons. The goal of this work is to set limits on the mass and the decay width of the Higgs boson. The basis to compute the physical quantities is the path integral which is here evaluated by means of Monte Carlo simulations thus allowing for fully non perturbative calculations. A polynomial hybrid Monte Carlo algo- rithm is used to incorporate dynamical fermions. The chiral symmetry of the electroweak model is incorporated by using the Neuberger overlap operator. Here, the standard model is considered in the limit of a Higgs-Yukawa sector which does not contain the weak gauge bosons and only a degenerate doublet of top- and bottom quarks are incorporated. Results from lattice perturbation theory up to one loop of the Higgs boson propagator are compared with those obtained from Monte Carlo simulations. At all values of the investigated couplings, the perturbative results agree very well with the Monte Carlo data. A main focus of this work is the investigation of the resonance parameters of the Higgs boson. The resonance width and the resonance mass are investigated at weak and at large quartic couplings. The Higgs boson does not appear as an asymptotic stable state but as a resonance. In all considered cases the Higgs boson resonance width lies below 10% of the resonance mass. The obtained resonance mass is compared with the mass obtained from the Higgs boson propagator. The results agree perfectly at all values of the quartic coupling considered. Finally, the effect of a heavy fourth generation of fermions on the upper and lower Higgs boson mass bound is studied. All numerical results presented in this work involve extensive finite volume analysis and an extrapolation to infinite volume is inevitable.
Hallberg, Jesper. "Study of charged Higgs bosons using multi-jet final states with the ATLAS experiment at the LHC." Thesis, Uppsala universitet, Högenergifysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227536.
Повний текст джерелаLe, Corre Solen. "Higgs boson phenomenology beyond the Standard Model." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1028.
Повний текст джерелаFollowing the discovery of the Higgs boson in June 2012 at the Large Hadron Collider, the particle collider located beneath the France-Switzerland border, interest in the study of the scalar sector in elementary particle physics significantly increased. In particular, as the Higgs boson plays a very special role in the Standard Model of particle physics, experimentalists study its properties with great care.The goal of the Standard Model is to describe the interactions between elementary particles. However the theory is not quite complete. Indeed, in addition to some purely theoretical problems, a number of experimental observations cannot be explained by the Standard Model. Theorists are therefore looking for a more comprehensive theory able to fully explain the observations.This thesis is based on the study of the scalar sector of two different extensions of the Standard Model of particle physics. I have worked on the Two-Higgs Doublet Model – this model is purely effective but can be included in more comprehensive theories – as well as on a model based on a combination of Technicolor and Composite Higgs theories in the framework of the SU (4) ? Sp(4) symmetry breaking pattern. I studied the latter via an effective approach but the full theory is able to get rid of some of the pitfalls of the Standard Model.These two models include a scalar sector that is richer than the one found in the Standard Model and contain at least one particle which can be assimilated to the Higgs boson discovered at the LHC.I performed a phenomenological study for these two models and tested them against both theoretical and experimental constraints. In particular I used the latest studies on the 125 GeV Higgs boson and on possible additional scalars performed by the ATLAS and CMS collaborations. The application of all these constraints drastically reduced the available parameter space of the two models. In particular it narrowed the possible mass range of the additional scalars, allowing to know more accurately where to search them experimentally in order to prove or rule out their possible existence.As of today the two theories I worked on are still not excluded by the latest experimentaldata
Lietti, S. M. (Sérgio Morais). "Lagrangeanas efetivas e acoplamentos anômalos do bóson de Higgs /." São Paulo, 1998. http://hdl.handle.net/11449/132812.
Повний текст джерелаBanca: Manuel Drees
Banca: Vicente Pleitez
Banca: Carlos Ourívio Escobar
Banca: Takeshi Kodama
Resumo: 0 Modelo Padrão é, hoje em dia, a melhor formulação teórica para a descrição das interações eletrofracas. 0 acordo entre resultados experimentais e previsões teóricas é expressivo para acoplamentos entre bósons vetoriais e férmions. Porém, possuímos poucas informações sobre o bóson de Higgs, remanescente do mecanismo de quebra de simetria eletrofraca responsável pela geração das massas dos férmions e dos bósons vetoriais. Neste trabalho procuramos explorar alternativas para os acoplamentos do bóson de Higgs aos demais bósons da teoria através do uso de lagrangeanas efetivas. Examinamos as consequências destas novas interações em diversas reações envolvendo a produção e decaimento do bóson de Higgs em colisões elétron-pósitron e hadrônicas. 0 estudo dessas reações nos permite impor vínculos sobre as constantes de acoplamento destas novas interações, os quais são comparados com os limites experimentais das constantes de acoplamento da parametrização convencional dos auto-acoplamentos entre os bósons vetoriais IVWZ e W'gama'.
Abstract: The Standard Model is the best theoretical framework which describes the elec- troweak interactions. The agreement between experimental data and theoretical predictions is spectacular for the fermion-vector boson couplings. However, we have few information concerning the electroweak symmetry breaking sector of the theory. In this Work we explore diíferent possibilities for the couplings among the Higgs boson and the vector bosons of the theory through the use of the effective lagrangian formalism. We examine the consequences of these new interactions in several re- actions involving the Higgs boson production and decay at electron-positron and hadronic collisions. We analyze these reactions in order to impose bounds on the coupling constants of these new interactions. These bounds are compared with the experimental limits on the usual parametrization of the anomalous WWZ and WW'gama'
Doutor
Saadi, Hassan. "Dilaton as the Higgs particle." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60177.
Повний текст джерелаScience, Faculty of
Mathematics, Department of
Graduate
Rayan, Steven. "Geometry of co-Higgs bundles." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543002.
Повний текст джерелаPatt, Brian Lawrence. "Higgs family symmetry and supersymmetry." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36397.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 77-79).
In this thesis we investigate building models of family symmetry that give the Higgs fields family structure. We construct several models, starting with 2 generation models then moving onto 3 generation models. These models are described sequentially in chapters 2 through 6. All of these models are supersymmetric and they did not previously exists in the literature. In these models, quark (and lepton) masses and mixings are determined the vacuum expectation values of the family sector. These vacuum expectation values (VEV) can have a hierarchal structure because they correspond to flat directions of a superpotential. At low energies these models contain just one light pair of Higgs fields. Experimentally, the most interesting feature of these models are couplings between the low energy Higgs and moduli of the family sector. These couplings should be observable at the Large Hadron Collider.
by Brian Lawrence Patt.
Ph.D.
Guardado, Karla (Karla M. ). "Preheating in new Higgs inflation." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100337.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 37-38).
Cosmological inflation describes the phenomenon in the early universe when spacetime underwent a rapid, exponential expansion right after the Big Bang. Inflation solves the so-called "horizon problem," "flatness problem," and "monopole problem" of standard Big Bang cosmology. Furthermore, New Inflation solves the "graceful exit problem" of the original theory. In inflation, the energy density of a patch of the early universe becomes dominated by the potential energy of a scalar field in a state of false vacuum. This particular form of energy leads to a negative pressure, creating a repulsive gravitational force, driving the region into a period of exponential expansion. Soon after the end of inflation, the field oscillates, leading to the creation of particles in a process called reheating. If reheating begins with parametric resonance, the process is called preheating. New Higgs Inflation presumes that the Higgs field is the scalar field in question, involving a characteristic non-minimal "derivative" coupling. The equation of motion for the field evolves like a damped harmonic oscillator, so we expect it to oscillate near the end of inflation. We study the dynamics of the Higgs field during and after inflation and find that preheating should be efficient in this model.
by Karla Guardado.
S.B.
Kwong, Kam-Yuen. "Quantum induction and Higgs mass." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289767.
Повний текст джерелаLindahl, Viveca. "Detection Prospects of Doubly Charged Higgs Bosons from the Higgs Triplet Model at the LHC." Thesis, Uppsala universitet, Högenergifysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155961.
Повний текст джерелаEstre, Nicolas Contardo Didier. "Caractérisation des détecteurs silicium, recherche de Vertex et étude du potentiel de découverte d'un boson de Higgs chargé léger dans l'expérience CMS." Villeurbanne : Université Claude Bernard, 2004. http://tel.ccsd.cnrs.fr/docs/00/04/82/96/PDF/tel-00009847.pdf.
Повний текст джерелаCharfeddine, Driss. "Etude du bruit de fond du canal H->ZZ->4l dans l'expérience ATLAS du LHC et recherche au-delà du modèle standard par le modèle à deux doublets de Higgs." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01000000.
Повний текст джерелаElias, Miró Joan. "Theoretical Implications of the Higgs Discovery." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/311621.
Повний текст джерелаThe discovery of the Higgs at the Large Hadron Collider has triggered a renewed inte- rest on understanding the physical mechanism behind electroweak symmetry breaking. The Higgs boson has opened a new window to probe possible new physics Beyond de Standard Model (BSM) through the measurements of its couplings and its mass value. The Higgs physics is the current energy frontier and it is therefore very important that we explore it thoroughly. In the rst part of the thesis we discuss the implications of the Higgs mass value Mh for the stability of the electroweak (EW) vacuum. We present the next-to-next-to-leading order analysis of the Standard Model Higgs potential. This analysis allows to reduce the theoretical uncertainty in the determination of the critical value of Mh for stability of the EW vacuum to 1 GeV. While the Higgs quartic coupling at the Planck scale is remarkably close to zero, absolute stability of the EW vacuum is excluded for the central experimental values of the Higgs and top quark masses. Next, we show that a heavy scalar singlet can induce a relatively large and positive tree-level threshold correction to the Higgs quartic coupling and stabilize the EW vacuum. We provide examples, such as the see-saw and the invisible axion, where the proposed mechanism is automatically implemented. In the second part we investigate how dimension-six operators, parametrizing heavy BSM physics, a ect the Higgs couplings. Under certain well-motivated assumptions, we nd that 8 CP-even plus 3 CP-odd Wilson coe cients parametrize the main impact in Higgs physics, as all other coe cients are constrained by non-Higgs SM measurements. We calculate the most relevant anomalous dimensions for these Wilson coe cients, which describe operator mixing from the heavy BSM scale down to the EW scale. This allows us to nd the leading-log corrections to the predictions for the Higgs couplings in speci c models, such as the MSSM or composite Higgs, which we nd to be signi cant in certain cases. Finally, in the third part we study the striking structure of the dimension-six anomalous dimension matrix. We present an argument, partly based on the use of supersymmetry as a spurious symmetry, that gives an explanation to the plethora of vanishing entries in the anomalous dimension matrix that are not forbidden by symmetries otherwise.
Lee, Jae Yong. "The little Higgs and some phenomenology /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9645.
Повний текст джерелаBonsdorff, Juhani. "A Fourier transform for Higgs bundles." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249510.
Повний текст джерелаQuevillon, Jérémie. "Higgs Physics Beyond the Standard Model." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01070196.
Повний текст джерелаWilliams, Peter Howard. "Hadronic Higgs production with forward jets." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/3131/.
Повний текст джерелаPasterski, Sabrina Gonzalez. "Measuring Higgs self-coupling at CMS." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83802.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (page 43).
This study evaluates the Compact Muon Solenoid (CMS) experiment's ability to characterize Higgs self-coupling through the ... channel. The effective cross-section for detecting ... events is computed by finding the fraction of simulated events that make it through selection cuts. These same cuts also are applied to simulated background samples. The result is then compared to a recent theoretical study on measuring Higgs self-coupling to check the applicability of its assumptions and the feasibility of its predictions. This study finds that the selection algorithms currently used for ... analyses at CMS produce a lower yield of signal events. Since the ... channel was predicted to be one of the most promising for characterizing the Higgs self-coupling constant, ... , the results of this study indicate that, unless the methods for reconstructing detected particles are improved, future data collected by CMS will not be sufficient to complete such an analysis.
by Sabrina Gonzalez Pasterski.
S.B.
Schaposnik, Laura P. "Spectral data for G-Higgs bundles." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7b483c4c-53e4-4449-88c2-7a75d98ac861.
Повний текст джерелаDias, Otávio Augusto Trivério [UNESP]. "Escalares de Higgs e decaimentos leptônicos." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/132575.
Повний текст джерелаSilva, Paulo José Ferreira Porfírio da. "Modelo de dois dubletos de higgs." Universidade Federal da Paraíba, 2013. http://tede.biblioteca.ufpb.br:8080/handle/tede/5756.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In this dissertation we did a complete review of the StandardModel(SM), emphasizing the weak interactions, this in order to treat an extension of theMP with addition of a doublet of scalar theory, known in the literature asModel with Two Higgs doublets (2HDM). We will treat this model from the point of view of both aspects: when two doublets develop the expected value of the vacuum(vev) and when only one develops doublets vev, utilize the potential of 2HDM does not violate CP. These two models are particularly important because they are quite simple and can solve some problems that are open in Physics, one of the most important is the dark matter (DM). Furthermore, we will use the formalism of oblique parameters, radiative corrections involving first order, to parameterize the effects of New Physics (NP). We will present the phenomenology to obtain 2HDMI and regions that are in agreement with the experimental data.
Nesta dissertação fizemos uma revisão completa doModelo Padrão (MP), dando ênfase as interações fracas, isto com o intuito de tratarmos de uma extensão do MP com adição de um dubleto de escalar a teoria, conhecida na literatura como Modelo com Dois Dubletos de Higgs(2HDM)1. Iremos tratar deste modelo sob o ponto de vista de dois aspectos: quando os dois dubletos desenvolvem valor esperado do vácuo(vev) e quando apenas um dos dubletos desenvolve vev, utilizamos o potencial do 2HDM que não viola CP. Particularmente, esses dois modelos são importantes porque eles são bastante simples e podemresolver alguns problemas que estão emaberto na Física, um dosmais importantes é amatéria escura(ME). Além disso, iremos utilizar o formalismo de parâmetros oblíquos, que envolve correções radiativas de primeira ordem, para parametrizar os efeitos da Nova Física(NF). Apresentaremos a fenomenologia para o 2HDMI e obteremos as regiões que estão de acordo com os dados experimentais.
Dias, Otávio Augusto Trivério. "Escalares de Higgs e decaimentos leptônicos /." São Paulo, 2004. http://hdl.handle.net/11449/132575.
Повний текст джерелаBanca: Mauro Donizeti Tonasse
Banca: Marcos Cardozo Rodriguez
Resumo: É estudado o decaimento do 'mü'- em dois diferentes modelos com simetrias de gauge 'SU(3) IND. c' X 'SU(3) IND. L' X 'U(1) IND. N'. Estes modelos coincidem com o modelo padrão a baixas energias, prevêem a existência de bósons de gauge bileptônicos e usualmente tem um setor escalar mais rico que o existente no modelo padrão. Fazendo uma redefinição da constante de Fermi, pode ser delimitada a massa do bóson de gauge dileptônico que aparece nos dois modelos e também é delimitada a massa de um escalar de Higgs
Abstract: We consider the 'mü'- leptonic decay in two different gauge models with 'SU(3) IND. c' X 'SU(3) IND. L' X 'U(1) IND. N' gauge symmetries. These models coincide with the standard model at low energies, predict the existence of bileptonic gauge bosons and its scalar sector is richer than the standard model one's. By redefining the Fermi constant, a limit for the bileptonic gauge boson may be set and, in case the new gauge boson is much heavier than the Higgs particle, a limit for the scalar may also be set
Mestre
Branco, Lucas Castello. "Higgs bundles, Lagrangians and mirror symmetry." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:612325bd-6a7f-4d74-a85c-426b73ff7a14.
Повний текст джерелаEl, Faham Hesham. "Phenomenological Studies on Composite Higgs Models." Thesis, Uppsala universitet, Högenergifysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-359903.
Повний текст джерелаÖhman, Henrik. "Analysis of early data from the ATLAS experiment towards H+ searches." Thesis, Uppsala universitet, Högenergifysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159414.
Повний текст джерелаSpearman, William R. "Measurement of the mass and natural width of the Higgs boson in the H to ZZ to 4l decay channel with the ATLAS detector." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13070058.
Повний текст джерелаPhysics
Schwoerer, Maud. "'Etudes des états finals diphoton dans l'expérience ATLAS au LHC : mesure de section efficace différentielle, découverte d'une nouvelle résonance dans la recherche du boson de Higgs et étude de ses propriétés'." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00978539.
Повний текст джерелаChoudhury, Somnath. "Search for Neutral Higgs Bosons decaying to τ Pairs at the CMS experiment". Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112206.
Повний текст джерелаThe thesis describes a study of the τ-pair final state in the semi-leptonic decay mode into muon and hadrons using proton-proton collisions data at a center-of-mass energy of 7 TeV using the CMS detector at the CERN Large Hadron Collider. The performance of τ-lepton reconstruction and identification algorithm is studied using a data sample of proton-proton collisions at √s = 7 TeV, corresponding to an integrated luminosity of 36 pb⁻¹. The τ leptons that decay into one charged hadron with or without the association of neutral hadrons is reconstructed using Particle-Flow object reconstruction technique with a novel τ identification algorithm called the Hadron Plus Strips (HPS) algorithm in the CMS tracker and electromagnetic calorimeter. The reconstruction efficiency of the algorithm is measured using τ leptons produced in Z-boson decays. The hadronically decaying τ lepton misidentification rate for jets produced in association with a W boson is also determined. The first measurement of inclusive Z→ττ production in pp collisions at the LHC is presented in muon+hadrons final state using a data sample of 36 pb⁻¹. The measured cross-section is in good agreement with the next-to-next-to-leading order (NNLO) QCD prediction. After establishing the Z boson in di-τ decay mode, an inclusive search for neutral minimal supersymmetric standard model (MSSM) Higgs bosons in pp collisions is performed at a center-of-mass energy of 7 TeV. The results are based on a data sample corresponding to an integrated luminosity of 36 pb⁻¹ and 4.6 fb⁻¹ recorded by the CMS experiment in the year 2010 and 2011 respectively. The search uses decays of the Higgs bosons to τ pairs. No excess is observed in the τ-pair invariant-mass spectrum. The resulting upper limits on the Higgs boson production cross-section times the branching fraction to τ pairs, as a function of the pseudoscalar Higgs boson mass, yield stringent bounds in the MSSM parameter space
Almeida, Miquéias Melo de. "Obtenção de um limite para a largura do bóson de Higgs no experimento CMS via H→ ZZ → (4e, 4, 2e2)." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8860.
Повний текст джерелаApresenta-se neste trabalho um estudo sobre a largura de decaimento total do bóson de Higgs através do canal H→ ZZ → (4e, 4, 2e2). Segundo o Modelo Padrão da Física de Partículas Elementares, um bóson de Higgs com massa de 126 GeV deve ter uma largura de decaimento total ΓH = 4.15 MeV, muito abaixo da resoluções dos experimentos instalados no LHC. Isto impede uma medida direta sobre os eventos da ressonância. Recentemente foi proposto limitar ΓH a partir da relação entre a taxa de eventos observados na região da ressonância e na região off-shell. Utilizando o pacote de análise desenvolvido pela colaboração CMS obteve-se um limite de ΓH < 31.46(12.82) MeV em 95(68.3)% CL combinando os dados coletados pelo LHC em colisões pp em √s = 7 TeV (5.1fb-1) e em √s = 8 TeV (19.7fb -1).
We present in this work a study about the Higgs boson total width using the channel H→ ZZ → (4e, 4, 2e2. According to the Standard Model of Elementary Particle Physics, the Higgs boson with mass around 126 GeV should have a total decay width of ΓH = 4.15 MeV, very below the resolution of the experiments installed at the LHC. This fact prevents a direct measurement on the events of the Higgs resonance. Recently it was proposed limit ΓH from the relationship between the rate of events observed in the resonance and the off-shell regions. Using the package of analysis developed by CMS collaboration was obtained a limit of ΓH < 31.46(12.82)MeV in 95(68.3)% CL combining the data collected by the LHC in pp collisions at √s = 7 TeV (5.1fb-1)and at √s = 8 TeV (19.7fb -1).
Mahboubi, Kambiz. "ATLAS level-1 jet trigger rates and study of the ATLAS discovery potential of the neutral MSSM Higgs bosons in b-jet decay channels." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961739746.
Повний текст джерелаOkpara, Anna Nwaada. "Search for charged Higgs bosons at centre of mass energies of 189-209 GeV at LEP." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963720678.
Повний текст джерелаBuszello, Claus Peter. "Bestimmung der Kopplungsstruktur des Higgs-Bosons mit dem Atlas-Detektor." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970692889.
Повний текст джерелаEfron, Jonathan Zvi. "Search for the Higgs Boson in the ZH → ℓ+ℓ-bb̄ Channel at CDF Run II". The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1189015468.
Повний текст джерелаParks, Brandon Scott. "Search for the Higgs Boson in the ZH to vvbb channel at CDF run II." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1215108702.
Повний текст джерелаMontull, Garcia Marc. "Higgs Phenomenology and The Hamiltonian Truncation Method." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/399334.
Повний текст джерелаThis thesis is based on the publications done as a PhD student at IFAE during the periods 2012-2013 and 2015. These include two separate topics, Higgs phenomenology at the LHC within the frameworks of Composite Higgs and Supersymmetry and the improvement of the Renormalized Hamiltonian Truncation Method (RHTM). The first part of this thesis was motivated by the Naturalness problem in the Standard Model (SM), which was triggered by the discovery in 2012 of a scalar particle with a mass of 125 GeV and signal strengths compatible with the SM Higgs. The aim of these projects was to asses the impact of the measured mass and signal strengths on two of the best motivated frameworks that tackle the Naturalness problem; Composite Higgs and Supersymmetric extensions of the SM. This part of the thesis is organised as follows. In Chapter 1 we give an overview to the SM its shortcomings and motivate the need to go beyond the Standard Model (BSM). Brief introductions to Spontaneous Symmetry Breaking (SSB) and the CCWZ are also included due to their importance in the understanding of the SM and their pivotal role in the study of BSM physics . In Chapter 2 we study the implications of the Higgs discovery for different Composite Higgs models. This is done by using the signal strengths given by the experiments right after the Higgs discovery in 2012, which allow to greatly constrain the parameter space of some of these models. Chapter 3 is focused on the study of the Higgs couplings in Composite Higgs models based on the SO(5)/SO(4) coset. We show that the Higgs couplings to gluons and photons are insensitive to light fermionic resonances assuming that they preserve CP. Also, we find that at leading order in the mixings, the Higgs couplings to tops and gluons, when normalized to the Standard Model (SM), are equal. In Chapter 4 we study the relation between the Higgs couplings and the Higgs mass in Supersymmetric models while finding that the measured 125 GeV Higgs and the signal strengths can be competitive with direct searches in excluding some parts of the parameter space in the Higgs sector. We focus on the MSSM with heavy stops, and possible extensions that alleviate the small hierarchy problem. The second part of this thesis was motivated by two papers by Rychkov et al. where they present a promising new method to solve strongly coupled systems. The method consist in improving the already known Hamiltonian Truncation Method used to numerically solve strongly coupled systems. The improvement comes from analytically integrating out the high energy modes which results in a considerable improvement to the numerical result, and allows to reduce computational power needed to solve any given system. Our work, presented in Ch. 5, improves the method by finding the general expressions needed in the procedure to integrating out the high energy modes, and solves some of the issues left open in their work.
Correia, Fagner Cintra [UNESP]. "Física de sabores e modelos multi-Higgs." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/108884.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O modelo331 mínimo consiste em uma extensão ao Modelo Padrão amparada em SU'(3) IND.L' ? U'(1) IND. X'. Os férmions se transformam como tripletos ou anti-tripletos de SU'(3) IND. L' com componentes envolvendo quarks exóticos e partículas conhecidas da fenomenologia atual. Nosso objetivo aqui é explorar qualidades adicionais e limitar novos parâmetros do 331 a partir de processos que violem sabor, como a mistura de mésons neutros
The minimal 331 model has been proposed as an extension of the Standard Model based on the gauge group SU'(3) IND. L' ?U'(1) IND.X'. In this model, the left-handed fermions transform as triplets (or anti-triplets) under the action ofSU'(3) IND. L', whose generations correspond to the known SM fermions and new heavy quarks. Our purpose here is to constrain the 331 parameters considering the limits of ?avour changing processes as meson mixing
FAPESP: 11/16636-6
Seymour, Michael H. "Predictions for Higgs and electroweak Boson production." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260459.
Повний текст джерелаGothen, Peter Beier. "The topology of Higgs bundle moduli spaces." Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308587.
Повний текст джерелаGrant, Jackie. "Sphalerons in two Higgs doublet electroweak models." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341066.
Повний текст джерелаCabi, Serkan. "Cosmology of hidden sector with Higgs portal." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/52778.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 67-75).
In this thesis, we are investigating cosmological implications of hidden sector models which involve scalar fields that do not interact with the Standard Model gauge interactions, but couple directly to the Higgs field. We particularly focus on their relic particle density as a candidate for dark matter. For the case of hidden sector without a gauge field we have improved the accuracy of the bounds on the coupling constant and give bounds on the Lagrangian parameters. Models with Abelian and non-Abelian gauge fields are also studied with relic density bounds, BBN and galactic dynamics constraints. Several discussions on phase transitions and alternative dark matter candidates are included.
by Serkan Cabi.
Ph.D.
Kling, Felix, Jose Miguel No, and Shufang Su. "Anatomy of exotic Higgs decays in 2HDM." SPRINGER, 2016. http://hdl.handle.net/10150/622345.
Повний текст джерела