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Dissertations / Theses on the topic 'Quark and lepton masses'

Author: Grafiati

Published: 14 March 2023

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1

Malinsky, Michal. "Quark and Lepton Masses and Mixing in Supersymmetric Grand Unified Theories." Doctoral thesis, SISSA, 2005. http://hdl.handle.net/20.500.11767/4198.

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The material is organized as follows: the first chapter is devoted to several remarks on the two basic supersymmetric GUTs - first the minimal SUSY SU(5) is considered and the main shortcomings are pointed-out in brief, and in the second part these issues are addressed concerning a general class of SO(lO) models. This provides a natural motivation to approach and describe shortly the minimal SUSY SO(lO) scheme in the second chapter. The third chapter is dedicated to a detailed study of the correlations among the quark and lepton masses and mixing within the framework with dominant tripl

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2

Ferrara, Valentina. "Extraction of the top quark mass from the total top quark pair production cross section in the single lepton channel." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16727.

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In dieser Arbeit wird eine Messung des totalen {\ttb} Produktions-Wirkungsquerschnitts im Einzellepton-Kanal vorgestellt. Der Wirkungsquerschnitt wird mittels einer Profile-Likelihood-Anpassung von Templates bestimmt, welche \"uber einen Lieklihood-Klassifikator unter Benutzung von vier kinematischen Variablen konstruiert werden. F\"ur ein Top-Quark der Masse $m_t=172.5$ GeV ergibt sich ein gemessener Wirkungsquerschnitt von $178.9 \pm 12$ pb, welcher innerhalb einer Standardabweichung mit den aktuellsten theoretischen Vorhersagen \"uberein stimmt. Um die Massenabh\"angigkeit des experimentell

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3

Capelli, Laurent. "Étude des dimuons de la région des masses intermédiaires produits dans les collisions d'ions lourds auprès du SPS du CERN." Lyon 1, 2001. http://www.theses.fr/2001LYO10041.

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Dans cette thèse, nous étudions la production des dimuons dans une région de masse entre les résonances et j/ (région des masses intermédiaires, imr) dans les collisions proton-noyau et noyau-noyau de haute énergie. L'expérience Na50, installée auprès de l'accélérateur SPS du CERN, détecte les paires de muons émises dans ces interactions au moyen d'un spectromètre spécifique. La mesure de la centralité des collisions repose sur trois détecteurs indépendants : un calorimètre électromagnétique, un détecteur de multiplicité et un calorimètre a zéro degré. Les résultats des analyses proton-noyau f

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4

Wang, Ping. "Studies of lepton and quark interactions." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53614.

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Part I Proposed Experimental Tests of the Right-handed Weak Current All possible experiments which test the SU(2)<sub>L</sub> x U(1)<sub>R</sub> x U(1)<sub>B-L</sub> model and SU(2)<sub>L</sub> x SU(2)<sub>R</sub> x U(1)<sub>B-L</sub> model using the LEP e⁺e⁻ collider and HERA e⁻p collider are calculated and the most sensitive experiments are examined. Part II Semi-Phenomenological Theory of (Qq̅) System The (QQ̅) and (Qq̅) mesons are calculated using a QCD motivated potential model. It is discovered that by including a long distance relativistic correction term derived by Grome, the

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5

Souchlas, Nicholas. "Quark Dynamics and Constituent Masses in Heavy Quark Systems." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1248013809.

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6

Kimchi, Itamar. "Quark masses : an environmental impact statement." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44761.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.<br>Includes bibliographical references (leaves 63-65).<br>We investigate how the requirement that organic chemistry be possible constrains the values of the quark masses. Specifically, we choose a slice through the parameter space of the Standard Model in which quark masses vary so that as many as three quarks play a role in the formation of nuclei, while keeping fixed the average mass of the two lightest baryons (in units of the electron mass) and the strength of the low-energy nuclear interaction. We classify unive

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7

Ogasahara, Atsushi. "Discrete flavor symmetry for lepton mixing and quark mixing." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/189340.

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8

Antusch, Stefan. "The running of neutrino masses, lepton mixings and CP phases." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969430248.

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9

Rimmer, Steven. "Neutrino masses and lepton flavour violating phenomena in the MSSM." Thesis, Durham University, 2007. http://etheses.dur.ac.uk/2521/.

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The most general supersymmetric model with minimal particle content and an additional discrete Ƶ(_3) symmetry, which allows lepton number violating terms, is considered. In this model, we calculate at the level of one-loop the resulting Majorana neutrino masses and the flavour violating radiative decays of charged leptons, ﺎ→ﺎ’γ. We first study the neutral scalar sector of the model, performing a calculable rotation of the scalar fields to a basis in which the sneutrino vacuum expectation values are zero. Lagrangian parameters are initialised without recourse to assumptions concerning trilinea

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10

Mes, Alexes K. "Light Quark Masses from QCD Finite Energy Sum Rules." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/30901.

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Due to quark-gluon confinement in QCD, the quark masses entering the QCD Lagrangian cannot be measured with the same techniques one would use to determine the mass of non-confined particles. They must be determined either numerically from Lattice QCD, or analytically using QCD sum rules. The latter makes use of the complex squared energy plane, and Cauchy’s theorem for the correlator of axial-vector divergences. This procedure relates a QCD expression containing the quark masses, with an hadronic expression in terms of known hadron masses, couplings, and lifetimes/widths. Thus, the quark masse

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11

Oliveira, Jorge Miguel Da Silva Borges. "Lepton flavour violation, Yukawa unification and neutrino masses in supersymmetric unified models." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340363.

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12

Wirén, Jens. "Higgs Lepton Flavour Violation and Radiative Neutrino Masses in the Zee Model." Thesis, KTH, Fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210307.

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13

Abazov, V. M., B. Abbott, B. S. Acharya, et al. "Measurement of top quark polarization in t ¯ t lepton + jets final states." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/622747.

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We present a measurement of top quark polarization in t (t) over bar pair production in p (p) over bar collisions at root s = 1.96 TeV using data corresponding to 9.7 fb(-1) of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. We consider final states containing a lepton and at least three jets. The polarization is measured through the distribution of lepton angles along three axes: the beam axis, the helicity axis, and the transverse axis normal to the t (t) over bar production plane. This is the first measurement of top quark polarization at the Tevatron

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14

Napoletano, Davide. "Treatment of quark masses in b-associated production at the LHC." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12409/.

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With the discovery of the Higgs boson at the Large Hadron Collider (LHC), and no signs of new physics to current date, precise theoretical predictions are of increasing importance. It is now essential to study in details the properties of the newly found boson, in particular its coupling to other particles and itself, as this unveils further the mechanism of symmetry breaking. In this thesis, we extend the currently used methods to deal with heavy quarks in hadron collision processes, the four-flavour and the five-flavour scheme, to con- sistently include mass effects as well as resummation of

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15

Rasmussen, Rasmus Westphal. "Implications of physics beyond the Standard Model in the quark and lepton sectors." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19174.

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Das Standardmodell (SM) der Teilchenphysik hat sich in der Praxis als vielseitige Theorie bewährt, dennoch deuten nichtverschwindende Neutrinomassen, dunkle Materie und Baryonenasymmetrie auf Physik jenseits des SM (BSM) hin. Um also ein mit den Beobachtungen konsistentes Modell zu entwickeln, ist eine umfassendere Theorie nötig. Experimentell kann entweder in Abweichungen von den Vorhersagen des SM nach neuer Physik gesucht werden. So kann jedes BSM-Szenario getestet werden. In dieser Arbeit werden BSM-Szenarien im Quark- sowie im Leptonen-Sektor und deren phänomenologische Konsequenzen a

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16

Kajfasz, Eric. "Quelques expériences gravitant autour du problème de génération de masses." Habilitation à diriger des recherches, Université de la Méditerranée - Aix-Marseille II, 2002. http://tel.archives-ouvertes.fr/tel-00002687.

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17

Gluckman, Gary Richard. "Determination of the charm- and beauty-quark masses from QCD sum rules." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/17051.

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Bibliography: pages 58-59.<br>Ratios of Laplace QCD sum rules are used in order to determine the on-shell charm- and beauty-quark masses. After confronting the experimental data in the charmonium and bottonium systems with theory, we obtain mc = 1.46 ± 0.07 GeV and mb = 4.70 ± 0.07 GeV. The error is due to the uncertainties in the values of Λ and the gluon condensate.

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18

Bielski, Rafal. "Top quark pair production measurements in the single lepton channel using the ATLAS detector." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/top-quark-pair-production-measurements-in-the-single-lepton-channel-using-the-atlas-detector(ff46d1b0-0102-47d5-a60c-3a9e4ae07c07).html.

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Three measurements of top-quark pair production cross sections in proton-proton collisions at sqrt(s) = 13 TeV using data collected by the ATLAS experiment are presented. The single-lepton final states are used, where one electron or muon, two b-jets and two other jets can be identified. The inclusive ttbar production cross section is measured to be sigma(ttbar) = 817 +/- 13 (stat.) +/- 103 (syst.) +/- 88 (lum.) pb, which is in good agreement with predictions and with other measurements. Absolute and relative differential cross sections of ttbar production are also measured, showing an overall

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19

Kämpfer, Burkhard, André Peshier, G. Soff, and O. P. Pavlenko. "An new effective model of the quark-gluon plasma with thermal parton masses." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32370.

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20

Kämpfer, Burkhard, André Peshier, G. Soff, and O. P. Pavlenko. "An new effective model of the quark-gluon plasma with thermal parton masses." Forschungszentrum Rossendorf, 1994. https://hzdr.qucosa.de/id/qucosa%3A22065.

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21

Hasan, Nesreen [Verfasser]. "A lattice QCD study of nucleon structure with physical quark masses / Nesreen Hasan." Wuppertal : Universitätsbibliothek Wuppertal, 2020. http://d-nb.info/1207005657/34.

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22

Jackson, David John. "Investigations into tau lepton and charm quark creation by electron-positron interactions at 91 GeV." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358151.

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23

De, Vasconcelos Corga Kevin. "Étude du couplage du boson de Higgs au quark top dans les canaux avec deux leptons de même signe avec l’expérience ATLAS au LHC." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0316.

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Le Grand Collisionneur de Hadrons (Large Hadron Collider, LHC), au CERN (European Organisation for Nuclear Research), permet de sonder la matière à l’échelle subatomique. Après deux ans d’arrêt pour raison de maintenance et mises à jour, le LHC a redémarré en juin 2015 avec une augmentation de luminosité et d’énergie dans le centre de masse de 8 à 13 TeV. La première partie de ce document traite de la mesure de l’eﬃcacité de reconstruction des électrons dans le détecteur ATLAS avec 27:7 fb−1 de données collectées en 2016. L’environnement hadronique des collisions voit les leptons être des marq

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24

Jeong, Yu Seon. "Quark and lepton mass effects and the observational constraints on the high energy neutrino cross sections." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1233.

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The cross sections of neutrino-nucleon scattering at high energies are evaluated with quark masses at next-to-leading order in strong interaction corrections. We compare the results with two kinds of schemes for treating the heavy quarks, the fixed flavor number scheme and the variable flavor number scheme for muon neutrino-nucleon interaction, and discuss which scheme is more relevant. The optimized parton distribution functions (PDF) for the flavor number schemes are also evaluated. The tau mass, much larger than the muon mass, suppresses the cross sections at low energies. We calculate the

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25

Green, Jeremy Russell. "Studies in hadron structure using lattice QCD with quark masses that almost reach the physical point." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84184.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 93-100).<br>Lattice QCD allows us to study the structure of hadrons from first-principles calculations of quantum chromodynamics. We present calculations that shed light on the behavior of quarks inside hadrons in both qualitative and quantitative ways. The first i

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26

Ferrara, Valentina [Verfasser], Ulrich Akademischer Betreuer] Husemann, Hermann [Akademischer Betreuer] [Kolanoski, and Wolfang [Akademischer Betreuer] Lohmann. "Extraction of the top quark mass from the total top quark pair production cross section in the single lepton channel / Valentina Ferrara. Gutachter: Ulrich Husemann ; Hermann Kolanoski ; Wolfang Lohmann." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://d-nb.info/1034123718/34.

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27

Linacre, Jacob Thomas. "A top quark mass measurement using a matrix element method." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:c716f985-1913-46fb-a11b-1ef973ba4e6f.

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A measurement of the mass of the top quark is presented, using top-antitop pair (t-tbar) candidate events for the lepton+jets decay channel. The measurement makes use of Tevatron proton-antiproton collision data at centre-of-mass energy 1.96 TeV, collected at the CDF detector. The top quark mass is measured by employing an unbinned maximum likelihood method where the event probability density functions are calculated using signal (t-tbar) and background (W+jets) matrix elements, as well as a set of parameterised jet-to-parton mapping functions. The likelihood function is maximised with respect

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28

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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29

Gottardo, Carlo Alberto [Verfasser]. "Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector / Carlo Alberto Gottardo." Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1198933267/34.

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30

Lefeld, Anthony J. "Search for Enhancements of Associated Top Quark Production in Multiple Lepton Final States in the Context of Effective Field Theories." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574427195392083.

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31

Tourneur, Stéphane. "Search for top pair production in the dilepton decay channel with tau lepton at the CDF experiment." Paris 6, 2006. http://www.theses.fr/2006PA066422.

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La recherche des désintégrations du quark top impliquant un lepton tau au détecteur CDF, dans les collisions p/pbar \à 1. 96 TeV du Tevatron, a deux finalités principales : observer l'un des derniers canaux t/tbar et rechercher d'éventuels excès par au modèle standard. Le signal est ténu et difficile à extraire dans un bruit de fond dominé par des événements Z->TauTau+ 2 jets, et W+3 jets où un jet est identifié par erreur comme un tau hadronique. L'une des avancées de ce travail est le développement d'une méthode d'estimation rigoureuse du fond dominant de W+jets dans un environnement à ha

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32

Schieferdecker, Philipp. "Measurement of the Top Quark Mass at D0 Run II with the Matrix Element Method in the Lepton+Jets Final State." Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-44217.

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33

Moch, Paul [Verfasser], Martin [Akademischer Betreuer] Beneke, and Andreas [Akademischer Betreuer] Weiler. "Loop-induced lepton and quark dipole transitions in Randall-Sundrum models / Paul Moch. Betreuer: Martin Beneke. Gutachter: Andreas Weiler ; Martin Beneke." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1081768010/34.

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34

Hepburn, Derek John. "Light hadron spectrum, quark masses and meson decay constants from lattice QCD with O(a)-improved dynamical Wilson fermions." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/15009.

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In this thesis I present results for the light hadron spectrum, light quark masses and meson decay constants from numerical simulations of lattice QCD. The simulations were performed on a 16<sup>3</sup> x 32 space-time lattice using the standard Wilson gauge field action and a fully <i>O</i>(<i>a</i>)-improved Sheikholeslami-Wohlert fermion action with <i>N<sub>j</sub> </i>= 2 degenerate flavours of dynamical fermions. A subset of these simulations were performed at fixed lattice spacing, as determined through the Sommer scale parameter, <i>r</i><sub>o</sub>, in order to investigate the effect

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35

Meinel, Stefan. "Lambda(c) -> Lambda l(+)nu(l) Form Factors and Decay Rates from Lattice QCD with Physical Quark Masses." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/623030.

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The first lattice QCD calculation of the form factors governing Lambda(c) -> Lambda l(+)nu(l) decays is reported. The calculation was performed with two different lattice spacings and includes one ensemble with a pion mass of 139(2) MeV. The resulting predictions for the Lambda(c) -> Lambda e(+)nu(e) and Lambda(c) -> Lambda mu(+)nu(mu) decay rates divided by vertical bar V-cs vertical bar(2) are 0.2007(71)(74) and 0.1945(69)(72) p(s-1), respectively, where the two uncertainties are statistical and systematic. Taking the Cabibbo-Kobayashi-Maskawa (CKM) matrix element vertical bar V-cs vertical

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36

Dinh, Nguyen Dinh. "Probing the Possible TeV Scale See-saw Origin of Neutrino Masses with Charged Lepton Flavour Violation Processes and Neutrino Mass Spectroscopy Using Atoms." Doctoral thesis, SISSA, 2013. http://hdl.handle.net/20.500.11767/4727.

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In the first part of this thesis, we perform a detailed analysis of lepton flavour violation (LFV) within minimal see-saw type extensions of the Standard Model (SM), which give a viable mechanism of neutrino mass generation and provide new particle content at the electroweak scale. We focus, mainly, on predictions and constraints set on each scenario from muon and tau decays ($\mu\to e \gamma$, $\mu\to 3e$, $\tau\to (\mu,e) \gamma$ and $\tau\to 3\mu$) and $\mu-e$ conversion in the nuclei. In particular, we show that in some regions of the parameters space of type I and type II see-saw mo

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37

Balli, Fabrice. "Calibration de l'échelle d'énergie des jets et mesure de la masse du quark top dans le canal semi-leptonique dans l'expérience ATLAS." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01059762.

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L'objectif principal de cette thèse est de fournir une mesure aussi précise que possible de la masse du quark top dans son canal de désintégration semi-leptonique. Cette mesure expérimentale est réalisée à l'aide du détecteur ATLAS, installé auprès du LHC, un collisionneur proton-proton. Les motivations principales à cette mesure de précision sont les contraintes qu'elle apporte aux modèles de physique. Par ailleurs, la masse du quark top est un paramètre permettant d'estimer l'état de stabilité du vide dans le cadre du Modèle Standard, à l'échelle de Planck. Les jets sont des objets dont l'ét

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Bender, Michael [Verfasser], and Otmar [Akademischer Betreuer] Biebel. "Measurement of the top quark mass using lepton transverse momenta with the ATLAS detector at √s = 8 TeV / Michael Bender ; Betreuer: Otmar Biebel." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2017. http://d-nb.info/112910527X/34.

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Rasmussen, Rasmus Westphal [Verfasser], Walter [Gutachter] Winter, Christophe [Gutachter] Grojean, and Werner [Gutachter] Rodejohann. "Implications of physics beyond the Standard Model in the quark and lepton sectors / Rasmus Westphal Rasmussen ; Gutachter: Walter Winter, Christophe Grojean, Werner Rodejohann." Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1185667652/34.

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Rasmussen, Rasmus W. [Verfasser], Walter [Gutachter] Winter, Christophe [Gutachter] Grojean, and Werner [Gutachter] Rodejohann. "Implications of physics beyond the Standard Model in the quark and lepton sectors / Rasmus Westphal Rasmussen ; Gutachter: Walter Winter, Christophe Grojean, Werner Rodejohann." Berlin : Humboldt-Universität zu Berlin, 2018. http://nbn-resolving.de/urn:nbn:de:kobv:11-110-18452/19925-5.

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41

Agaras, Merve Nazlim. "Searches for associated Higgs Boson production with top quark pair and Higgs pair production in multi lepton final states with the ATLAS detector." Thesis, Université Clermont Auvergne‎ (2017-2020), 2020. http://www.theses.fr/2020CLFAC023.

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Depuis la découverte du boson de Higgs à une masse d'environ 125 GeV par les deux collaborations ATLAS et CMS en juillet 2012, il est devenu crucial de mesurer ses propriétés, telles que ses couplages avec d'autres particules, et de rechercher tout écart par rapport aux prévisions du Modèle Standard (SM). Le couplage Yukawa du quark top est proche de l'unité et est le plus fort dans le secteur fermionique. Par conséquent, ce couplage joue un rôle crucial dans la théorie. La détermination de la production de boson de Higgs avec une paire de quarks top (ttH) offre un accès a l'ordre dominant pou

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Caldeira, Balkeståhl Li. "Measurement of the Dalitz Plot Distribution for η→π+π−π0 with KLOE". Doctoral thesis, Uppsala universitet, Kärnfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266871.

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The mechanism of the isospin violating η→π+π−π0 decay is studied in a high precision experiment using a Dalitz plot analysis. The process is sensitive to the difference between up and down quark masses. The measurement provides an important input for the determination of the light quark masses and for the theoretical description of the low energy strong interactions. The measurement was carried out between 2004 and 2005 using the KLOE detector at the DAΦNE e+e− collider located in Frascati, Italy. The data was collected at a center of mass energy corresponding to the φ-meson peak (1019.5 MeV)

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43

Mergelmeyer, Sebastian [Verfasser]. "Measurement of the Associated Production of a Single Top Quark and a W Boson in Single-Lepton Events with the ATLAS Detector / Sebastian Mergelmeyer." Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/110718455X/34.

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Gilles, Geoffrey. "Recherche de résonances W' → tb dans le canal lepton plus jets avec le détecteur ATLAS au LHC." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22576/document.

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Le travail de recherche réalisé au cours de cette thèse s’inscrit dans le contexte de l’expérience ATLAS, l’une des quatre grandes expériences auprès du collisionneur LHC. Il fut principalement dédié à la recherche de nouveaux bosons de jauge lourds chargés, appelé W' et prédits par de nombreuses extensions du Modèle Standard de la physique des particules. Ce manuscrit présente une recherche du boson W' se désintégrant en un quark top et un quark beau à travers une approche de couplage effectif, dans des états finals de désintégrations leptoniques du quark top. Cette recherche fut réalisée ave

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Adlarson, Patrik. "Studies of the Decay η→π+π-π0 with WASA-at-COSY". Doctoral thesis, Uppsala universitet, Kärnfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-181236.

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In 2008 a large statistics sample of approximately 1·107 η-decays has been collected with the WASA detector at COSY using the pd→3Heη reaction at the beam kinetic energy of 1 GeV. These data are being used to study the not so rare η decays involving charged pions, like η→π+π-π0. This decay proceeds mainly via a strong isospin violating contribution, where the decay width is proportional to the light quark mass difference squared, (md-mu)2. In addition this decay can be used to search for C-violating effects. The analysis is presented and the Dalitz plot parameters with statistical and systemat

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Sperlich, Dennis. "Search for the production of a single excited b quark in the Wt final state with a single lepton in pp collisions at sqrt s = 13 TeV with the ATLAS detector." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://edoc.hu-berlin.de/18452/24063.

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In dieser Dissertation wird eine Suche nach einem angeregten $b$ Quark, $b^*$, durchgeführt. Für diese $b^*$ wird eine anomale Kopplung an Bosonen aus dem Standard Modell vorhergesagt. Diese Kopplung führt zu der Produktion in hochenergetischen Proton-Proton Kollisionen. In der Suche zielen wir auf Ereignisse, bei denen eines der zwei $W$ Bosonen in ein Elektron oder Muon zerfällt und das andere in ein Hadronenpaar. Da es nur ein Neutrino in diesem Prozess gibt, kann das ganze Ereigniss kinematisch rekonstruiert werden. Damit ist es möglich, die Masse des $b^*$ als diskriminierende Variab

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Göttfert, Tobias. "Background suppression for a top quark mass measurement in the lepton+jets tt decay channel and alignment of the ATLAS silicon detectors with cosmic rays." kostenfrei, 2010. https://mediatum2.ub.tum.de/node?id=956486.

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Smith, Geoffrey N. "A Search For the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton + Jets Channel at CMS." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397747965.

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Vasquez, Carmona Juan Carlos. "Phenomenology of the right-handed lepton mixings at the LHC in LR symmetric theory and the Time-Reversal symmetry violation in the µ --> eϒ decay and µ --> e conversion process". Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4913.

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We study how the elements of the leptonic right-handed mixing matrix can be determined at the LHC in the minimal Left-Right symmetric extension of the standard model. We do it by explicitly relating them with physical quantities of the Keung-Senjanovi\'c process and the lepton number violating decays of the right doubly charged scalar. We also point out that the left and right doubly charged scalars can be distinguished at the LHC, without measuring the polarization of the final state leptons coming from their decays. Then we study time reversal symmetry violation in the $\mu\rightarrow

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Staśto, Anna. "QCD analysis of deep inelastic lepton-hadron scattering in the region of small values of the Bjorken parameter x." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4515/.

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We present the new framework based on BFKL and DGLAP evolution equations in which the leading in(Q(_2)) and in(l/x) terms are treated on equal footing. We introduce a pair of coupled integro-difFerential equations for the quark singlet and the unintegrated gluon distribution. The observable structure functions are calculated using high energy factorisation approach. We also include the sub-leading in (l/x) effects via consistency constraint. We argue that the use of this constraint leads to more stable solution to the Pomeron intercept than that based on the NLO calculation of the BFKL equatio

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