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Dissertations / Theses on the topic 'Particle Physics - Standard Model (SM)'

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Published: 7 September 2023

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1

Glover, Brian Audley. "Topics in particle physics beyond the Standard Model." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539623541.

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We present new models of particle physics beyond the Standard Model. These models include extensions to the ideas of extra dimensions, deconstruction, supersymmetry, and Higgsless electroweak symmetry breaking. Besides introducing new models and discussing their consequences, we also discuss how galaxy cluster surveys can be used to constrain new physics beyond the Standard Model.;We find that an ultraviolet completion of gauge theories in the Randall-Sundrum model can be found in a deconstructed theory. The warping of the extra dimension is reproduced in the low energy theory by considering a
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2

Setford, Jack. "Strongly coupled physics beyond the standard model." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/77429/.

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This thesis is concerned with strongly coupled extensions to the Standard Model. The majority of the thesis is dedicated to the study of Composite Higgs models, which are a proposed solution to the hierarchy problem of the electroweak scale. In these models the Higgs is a composite pseudo-Nambu Goldstone boson which forms a part of a new strongly interacting sector. There are many different variations on the basic Composite Higgs theme { the current status of some of these variations is assessed in light of results from the Large Hadron Collider. A new kind of Composite Higgs model is presente
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3

Colburn, Russell J. III. "Beyond the Standard Model: Dark Matter and Collider Physics." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1507215920939059.

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4

Shaheen, Matloob H. "Neutral currents beyond the standard model." Thesis, Durham University, 1988. http://etheses.dur.ac.uk/6334/.

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The electroweak standard model (Salam-Weinberg) is well-known to be a satisfactory and consistent theoretical description of all the experimental data we have obtained so far. In this thesis, we discuss possible phenomenology which goes beyond the standard model, with particular emphasis on the neutral current effects. First of all, the left-right symmetric extension of the standard model is discussed and we find limits on its parameters. We show that this model cannot explain certain newly reported and highly speculative events at the CERN collider [3], which in principle could be caused by t
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5

Stephan, Christoph. "Noncommutative geometry and the standard model of particle physics." Aix-Marseille 1, 2005. http://www.theses.fr/2005AIX11042.

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Alain Connes a découvert une approche algébrique à la géométrie en remplaçant la géométrie Riemannienne de spin ordinaire par des triplets spectraux. Un triplet spectral est un ensemble avec trois membres : une algèbre, un opérateur de Dirac et un espace de Hilbert. Toutes les informations géométriques de la variété sont codées dans les triplets spectraux. Une qualité nouvelle de cette reformulation est la possibilité d'inclure des espaces non commutatifs. Ils sont représentés par des algèbres non commutatives, alors que les espaces ordinaires sont codés par des algèbres commutatives. Il est m
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Conroy, Justin M. "Modifications of spacetime and particle physics beyond the standard model." W&M ScholarWorks, 2005. https://scholarworks.wm.edu/etd/1539623481.

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In this dissertation we consider spacetime modifications that result in new physics beyond the standard model. We investigate various collider implications of a particular Lorentz-conserving formulation of QED in which spacetime coordinates are noncommuting. We also consider collider implications of Universal Extra Dimensions. Specifically, we address the possible formation of bound states involving the first quark KK-modes, i.e. KK-quarkonium. In addition, we consider the use of boundary conditions in extra dimensions to break gauge symmetries in unified theories. These boundary conditions ca
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7

Fok, Ricky. "Scenarios of Physics Beyond the Standard Model." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11940.

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xviii, 124 p. : ill. (some col.)<br>This dissertation discusses three topics on scenarios beyond the Standard Model. Topic one is the effects from a fourth generation of quarks and leptons on electroweak baryogenesis in the early universe. The Standard Model is incapable of electroweak baryogenesis due to an insufficiently strong enough electroweak phase transition (EWPT) as well as insufficient CP violation. We show that the presence of heavy fourth generation fermions solves the first problem but requires additional bosons to be included to stabilize the electroweak vacuum. Introducing su
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8

Jenkins, Alejandro Wise Mark B. "Topics in particle physics and cosmology beyond the standard model /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-06022006-145211.

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9

O'Leary, Benjamin Hugh. "Phenomenology of the minimal supersymmetric standard model without R-parity." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/1982.

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This thesis is an investigation into the current bounds on the trilinear R–parity–violating couplings in the Minimal Supersymmetric Standard Model without R–parity conservation. The model is described, and its implications are discussed. Bounds on the couplings are obtained from leptonic and mesonic decay data, approximating mediating sfermions as much heavier than the decaying particles and assuming that only one set of couplings is non–zero for each decay. Those bounds from the purely leptonic decay data are compared to bounds from the LEP–II data, over a large range of sfermion masses. A po
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10

Wade, Michael Fairbairn. "Semileptonic decays of heavy mesons and the standard model." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6045/.

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The formalism for a helicity amplitude analysis of the exclusive semileptonic decays of B mesons (B → Dlv and B → D* lv for l = e, µ and r) is introduced. In particular it is shown how measurements of the angular distribution of the subsequent decay D* → Dπ can fully determine the theoretically uncertain hadronic (B → D,D*) matrix elements. A spectator quark based model for the hadronic amplitudes is introduced, and then compared to other existing models and with the presently available experimental data, to extract the quark mixing matrix element |V(_eb)|. The extraction of |V(_ub)|, using ex
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11

Allison, Kyle F. "The standard model to the Planck scale." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:34c6b551-f525-4cf4-8032-c826b359bee4.

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The lack of direct evidence for physics beyond the SM at the LHC has led some to reevaluate the need for such physics to solve the hierarchy problem. Instead, the notion that the SM, or something like it, is valid up to the Planck scale and that technical naturalness is sufficient for solving the hierarchy problem has been suggested. This thesis examines minimal extensions of the SM that address its phenomenological and theoretical shortcomings while avoiding new physics between the electroweak and Planck scales that introduces a hierarchy problem. This thesis first studies two issues with the
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12

Heurtier, Lucien. "Particle physics and Cosmology beyond the Standard Model : Inflation, Dark Matter and Flavour." Palaiseau, Ecole polytechnique, 2015. https://theses.hal.science/tel-01176578/document.

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Cette thèse se concentre sur l’étude des aspects de la physique au delà du modèle standard et de ses applications à la cosmologie. Depuis les temps reculés de l’évolution de l’Univers, jusqu’à la supersymétrie de basse énergie et à la phénoménologie des accélérateurs, des travaux variés ont été réalisés utilisant pour la majeure partie une formulation de basse énergie, et ce à des stades différents de l’Histoire de l’Univers. En effet, des modèles d’inflation sont présentés sous l’angle de théories effectives (à un champs) provenant de théories de hautes énergies issues de la supergravité et d
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13

Bizi, Nadir. "Semi-riemannian noncommutative geometry, gauge theory, and the standard model of particle physics." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS413/document.

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Dans cette thèse, nous nous intéressons à la géométrie non-commutative - aux triplets spectraux en particulier - comme moyen d'unifier gravitation et modèle standard de la physique des particules. Des triplets spectraux permettant une telle unification on déjà été construits dans le cas des variétés riemanniennes. Il s'agit donc ici de généraliser au cas des variétés semi-riemanniennes, et d'appliquer ensuite au cas lorentzien, qui est d'une importance particulière en physique. C'est ce que nous faisons dans la première partie de la thèse, ou le passage du cas riemannien au cas semi-riemannien
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14

Meisler, Terje R. "Lepton flavour violation in minimal supersymmetric extensions to the Standard model." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-62.

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15

Buchanan, James Christopher. "A measurement of the ratio of the W+1 jet and Z+1 jet cross sections using the ATLAS detector at the LHC." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:16c481c8-b305-4890-a0d7-4dafd39deeec.

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The first measurement of the ratio of the W and Z cross sections in association with a single jet, known as the R_{Jets} measurement, is presented. The measurement was performed using 33pb^-1 of integrated luminosity, recorded during the year 2010 by the ATLAS detector at the LHC. At this time the LHC was operating at a center-of-mass energy of 7 TeV. The measurement is made as a function of the threshold on the jet transverse momentum, from 30 GeV up to a value of 200 GeV. The motivation for this measurement is outlined in terms of providing a stringent test of the Standard Model of particle
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16

Rosa, Joao P. T. G. "Aspects of beyond the Standard Model string phenomenology." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:5e21fba9-9211-4adb-9c73-d27e98910f30.

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String theory is currently the best-known candidate for a theory of quantum gravity, having the necessary ingredients to describe all known elementary particles and interactions. It also includes several novel features, arising, for instance, from the additional six compact dimensions required for its internal consistency, making it the natural arena to construct extensions of the Standard Model. In this thesis, we analyze some of the new phenomenological aspects introduced by string theory within the framework of low energy effective theories, focusing on their applications to cosmology, astr
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17

Maia, Marcilon Chaves. "An approach of the standard model of particle physics accesible to high school students." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6715.

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nÃo hÃ<br>Este trabalho tem como nÃcleo ou ponto central principal a exploraÃÃo de uma estÃria: âQuantolÃndia, a repÃblica das partÃculasâ, uma ficÃÃo criada pelo autor, na qual sÃo apresentados aspectos histÃricos, conceitos e idÃias da FÃsica das partÃculas elementares cujo propÃsito à oferecer uma maneira divertida e rica em analogias para apresentar o chamado âModelo padrÃo da fÃsica de partÃculasâ a estudantes do ensino mÃdio. A partir da estÃria busca-se construir o aprendizado apresentando as raÃzes da teoria atÃmica, as descobertas e conceitos que culminaram na atual modelagem das part
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18

Kao, Yee. "Constraints on New Physics from Neutrino and Other Particle Experiments." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/40435.

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In this thesis we analyze a number of past, current, and future experiments to extract information on physics beyond the Standard Model. We use the Jacobi method to derive a set of simplified expressions for the probabilities of neutrino oscillations in matter. we show the possible constraints that can be placed on various models beyond the Standard Model. In several cases, we find that the limits thus thus obtained could be competitive with those expected from direct searches at the Large Hadron Collider. We then consider the possible effects of new physics beyond the Standard Model on precis
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19

Wilson, Jonathan S. "A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1324333673.

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20

Vantalon, Thibaud. "Probing beyond the Standard Model physics using effective field theory." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/565736.

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Ara que el LHC ha proporcionat 120 fb-1 de dades, l'evidència d'una diferència d'energia entre el model estàndard (SM) i la nova física ha augmentat. Això fa que la teoria de camps efectiva (EFT) sigui un mètode versàtil per restringir la nova física amb una dependència mínima del model. En aquesta tesi, basada en el meu treball realitzat durant la meva candidatura a doctorat [1-4], fem ús de la tècnica EFT en diversos estudis. Comencem per estudiar l'extracció de acoblament trilineal del Higgs en els col·lisionadors actuals i futurs de leptons, utilitzant correccions de següent ordre en la pr
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21

Hansen, Christian. "Neutrino Oscillations and Charged Higgs Bosons – Experimental Projects for Physics beyond the Standard Model." Doctoral thesis, Uppsala University, Department of Nuclear and Particle Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5778.

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<p>This thesis is based on work done in two different experimental projects. </p><p>The first project, the Tau RICH, is a previously proposed τ-neutrino appearance experiment for the CERN neutrino beam at the Gran Sasso laboratory in Italy. The proposed experimental concept is based on the use of focusing RICH detectors with liquid radiator (C<sub>6</sub>F<sub>14</sub>). Simulations made with a Geant4 code show that in the proposed experimental set-up, Cherenkov light from delta electrons will constitute a severe background that in practice would render the experiment unfeasible.</p><p>The sec
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22

Boddy, Christopher. "A search for the Standard Model Higgs boson via its decay to tau leptons and W bosons at the ATLAS detector." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:abba39e7-4de1-46c5-a533-7b677ae254f2.

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Understanding the origin or Electroweak symmetry breaking within the Standard Model was a key motivation for the construction of the Large Hadron Collider (LHC) experiment at CERN. This thesis presents a search for evidence of Higgs boson production in the 4.7 fb−1 of collision data recorded at a centre-of-mass energy of 7 TeV at the ATLAS detector during 2011. This search is focused on signal events in which a Higgs boson is produced in the mass range 100 < mH < 180 GeV/c2 and subsequently decays to a pair of W bosons or a pair of tau leptons to final states with one hadronically decaying tau
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23

RADEMACHER, RICARDO JAVIER. "MINIMAL SUPERSYMMETRIC STANDARD MODEL PARAMETER SPACE EXCLUSION BY ANALYZING METASTABLE SCALAR VACUUM CONFIGURATIONS." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1022856740.

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24

Arnan, Vendrell Pere. "Building a Scenario of Physics Beyond the Standard Model in the Flavor Sector." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/670861.

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Recently lepton flavor universality tests in colliders have reported tensions with the Standard Model, providing an experimental hint at low energies of the effect of a new high energy theory. These tensions are known as flavor anomalies and that is why in this thesis we focus on the study of the impact of the flavor anomalies on the flavor sector of the Standard Model of particle physics. We introduce the Standard Model of particle physics and list the relevant tensions of the theory with the experiments in B decays, commenting in a brief manner the possible solutions involving new physics, a
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25

Bard, Deborah. "Search for the inclusive b->d gamma decay at BaBar." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/1556.

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Radiative penguin decays of B mesons are favour-changing neutral current (FCNC) processes, studies of which provide fertile ground for precision tests of the Standard Model. Because such decays must proceed through 1-loop or higher order processes, they are rare and their amplitudes are particularly sensitive to interference from other FCNC interactions beyond the SM. This thesis presents the search for the rare radiative penguin process b -> d gamma, carried out at the BABAR experiment.
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26

Bonnefoy, Quentin. "Topics beyond the Standard Model : axions, supersymmetry, string theory." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX034/document.

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Cette thèse a pour but l'étude de théories diverses, toutefois interconnectées, décrivant la nouvelle physique au-delà du modèle standard de la physique des particules. Ces sont des théories d'un nouveau type de particules, les axions, d'un nouveau principe de symétrie, la supersymétrie, et d'une nouvelle description des degrés de liberté fondamentaux, la théorie des cordes. Les progrès instrumentaux et théoriques constamment fait au fil des ans ont confirmé que ces théories sont des candidates privilégiées pour une description de la physique au-delà du modèle standard.Les axions sont d'abord
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27

Dießner, Philip. "Phenomenological Study of the Minimal R-Symmetric Supersymmetric Standard Model." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-212431.

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The Standard Model (SM) of particle physics gives a comprehensive description of numerous phenomena concerning the fundamental components of nature. Still, open questions and a clouded understanding of the underlying structure remain. Supersymmetry is a well motivated extension that may account for the observed density of dark matter in the universe and solve the hierarchy problem of the SM. The minimal supersymmetric extension of the SM (MSSM) provides solutions to these challenges. Furthermore, it predicts new particles in reach of current experiments. However, the model has its own theoreti
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28

Shen, Chun. "The standard model for relativistic heavy-ion collisions and electromagnetic tomography." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405931790.

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29

Makouski, Mikhail. "A measurement of top quark pair and photon production cross section with CMS detector." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19188.

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Doctor of Philosophy<br>Physics<br>Andrew G. Ivanov<br>In this thesis the measurement of production cross section of top-quark pairs in association with a photon in proton-proton collisions at a center of mass energy of 8 TeV is presented. The data was recorded at the CMS experiment at the LHC in 2012. This measurement aims to extend our knowledge of top quark properties and help to test consistency of the Standard Model (SM) of particle physics. Data-driven methods are used to estimate the photon identification efficiency and purity. The measured cross-section agrees with the standard model e
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30

Pernie, Luca. "Measurement of the Z boson pair-production cross section in proton-proton collisions at 7 and 8 TeV, and ECAL timing studies for the phase-2 upgrade of the CMS experiment." Doctoral thesis, Universite Libre de Bruxelles, 2015. https://dipot.ulb.ac.be/dspace/bitstream/2013/216690/3/tdmPernie.pdf.

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The Large Hadron Collider (LHC) marks a new era for particle physics. Thanks to the very high energy of the proton beams, and to the large amount of data collected in years 2010-12, the physicists at CERN can test the standard model (SM) consistency, can explore the scalar sector, and search for any hint of new physics. A measurement of the Z boson pair production cross section using proton-proton collisions at 7 and 8 TeV center-of-mass energy, recorded by the CMS (Compact Muon Solenoid) experiment is presented. Diboson production at the LHC is of particular interest: it validates rare SM pro
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31

Hierro, Rodriguez Ignacio Miguel. "Scalars beyond the Standard Model: Composite Higgs, dark matter and neutrino masses." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3426319.

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This thesis deals with Composite Higgs (CH) models, dark matter and neutrino masses. In CH models, the Higgs is a pseudo-Goldstone boson of a high-energy strong dynamics. We construct CP-even and CP-odd bosonic effective chiral Lagrangian for a generic symmetric coset G/H. Assuming that the only sources of custodial symmetry are the ones present in the SM, we study the projection of this Lagrangian into the low-energy SM chiral Lagrangian. This is applied in three particular scenarios: the original SU(5)/SO(5) Georgi-Kaplan model, the minimal custodialpreserving SO(5)/SO(4) model and the minim
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32

Sawyer, Craig Anthony. "Measurements of vector boson production in association with jets at the LHC using the ATLAS detector." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:9c8f606b-4b66-4a42-a200-11cf81ea84f0.

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This thesis presents measurements of the cross section for the production of a <i>W</i> boson in association with jets and the ratio of the cross sections for the production of a <i>W</i> boson and a <i>Z</i> boson in association with jets. Both measurements are performed in proton-proton collisions at &radic;s = 7 TeV with the ATLAS experiment at the Large Hadron Collider using a dataset corresponding to an integrated luminosity of 4.6 fb<sup>-1</sup>. The dataset allows for the exploration of a large kinematic range, including jet production up to a transverse momentum of 1 TeV and multiplic
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Wouda, Glenn. "Phenomenology of Higgs Bosons Beyond the Standard Model." Doctoral thesis, Uppsala universitet, Högenergifysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-240617.

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After a long history of searches, a Higgs boson H was discovered by the ATLAS and the CMS experiments at the Large Hadron Collider (LHC) in 2012. Its properties fit well the ones predicted by the Standard Model (SM) of particle physics. However, the SM can not explain other established properties of Nature, such as the existence of Dark Matter. For this reason, models beyond the SM should be considered. Such models often predict the existence of several Higgs bosons and this thesis explores some of those models. In particular, the possibility to discover a charged Higgs boson, which would be a
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Larner, Aimee Bridget. "Measurement of the Z—>TlTh cross-section and search for the standard model vector boson fusion produced Higgs —>TlTh at ATLAS." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:1b7174f0-802f-40ac-9ae9-bc0c589e4d6e.

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This thesis presents a cross-section measurement of the Z -+ TeTh process performed using the ATLAS detector at the Large Hadron Collider at CERN. The data used were collected at a centre-of-mass energy of 7 TeV during 2010 and corresponds to an integrated luminosity of 36 pb-I. This measurement uses the final state where one T lepton decays leptonically, to an electron or muon, plus neutrinos, and the other T lepton decays hadronically. The "(* / Z -+ a, It and di-boson background processes are estimated using Monte Carlo simulation, the W -+ TV Monte Carlo background prediction is estimated
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Sciandra, Andrea [Verfasser]. "Probing the Standard Model of particle physics with ttH, WWZ and WZZ multilepton final states / Andrea Sciandra." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/120447964X/34.

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36

Bianco, Gianluca. "Study of the quantum interference between singly and doubly resonant top-quark production in proton-proton collisions at the LHC with the ATLAS detector." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/22108/.

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The top quark is the heaviest known elementary particle of the Standard Model. Thanks to its particular properties, it allows to explore unique physics domains, inaccessible otherwise. One of them is the quantum interference between singly (tW) and doubly (t ̄t)resonant top quark production in proton-proton collisions, which can lead to identical WbWb final-states when an additional b-quark is radiated during a singly-resonant production. Studying this process is very important for a better knowledge of the Standard Model, but also to investigate some Beyond the Standard Model processes: for e
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Andrean, Stefio Yosse. "Search for Stop Using the ATLAS Detector and Performance Analysis of the Tile Calorimeter with Muons from W Decays." Licentiate thesis, Stockholms universitet, Fysikum, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-191555.

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This thesis presents a search for the supersymmetric partner of the top quark in the final state with one lepton. The search focuses especially in the region of the parameter space where the 2-body decay dominates. The analysis is performed using LHC full Run 2 data at √s = 13 TeV as recorded by the ATLAS detector. No significant excess above the backgrounds is observed, and 95% confidence level exclusion limits are calculated in the stop-neutralino mass plane. Stops are excluded up to 1200 GeV in the low neutralino mass scenario of below 400 GeV. The Tile Calorimeter is part of the ATLAS calo
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Reinsch, Andreas, and Andreas Reinsch. "Search for Colorful Quantum Black Holes Decaying to an Electron-Jet Final State with the ATLAS Experiment." Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12370.

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A search for quantum black holes with color charge decaying to one electron and one quark has been performed using data collected by the ATLAS Experiment at the Large Hadron Collider corresponding to 2.29 fb−1. No excess over the expected Standard Model interactions has been observed. Limits are set on the production cross section for events with one electron and one jet resulting from new physical phenomena. Models with a combined invariant mass of the electron and jet larger than or equal to 2.5TeV and a cross section above 2.6 fb are excluded at the 95% confidence level. This allows
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Tosi, Mia. "Feasibility of the SM Higgs boson search in the channel H ->ZZ^*->mumubb via VBF at sqrt(s)=7TeV with the CMS experiment." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427394.

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One of the main goals of the now-running Large Hadron Collider (LHC) machine at CERN in Geneva is to elucidate the mechanism of electroweak symmetry breaking, and in particular to determine whether a Standard Model Higgs boson exists or not. For this aim, and in general to explore the high-energy frontier of particle physics, the LHC produces proton-proton collisions in the core of two multi-purpose experiments: ATLAS and CMS. In the Compact Muon Solenoid (CMS) experiment one of the most promising discovery modes of the Higgs boson is the one involving the decay into two Z bosons, wit
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Stål, Oscar. "Physics at the High-Energy Frontier : Phenomenological Studies of Charged Higgs Bosons and Cosmic Neutrino Detection." Doctoral thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-111162.

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The Standard Model of particle physics successfully describes present collider data. Nevertheless, theoretical and cosmological results call for its extension. A softly broken supersymmetric completion around the TeV scale solves several of the outstanding issues. Supersymmetry requires two Higgs doublets, leading to five physical Higgs states. These include a pair of charged Higgs bosons H±, which are a generic feature of theories with multiple Higgs doublets. Using results from high-energy colliders and flavour physics, constraints are derived on the charged Higgs boson mass and couplings; b
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41

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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42

Eygi, Zeynep Deniz. "The Standard Model Analyasis Of The Cp Violation In The Inclusive Semileptonic B-meson Decays." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12604712/index.pdf.

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Being a flavor changing neutral current process, inclusive semileptonic B- meson decays provide reliable testing grounds for the Standard Model at the loop level. They are also importanat in the CKM phenomology and investing the CP violation due to the existence of sizable interference terms in the decay amplitude. In this work , the rare inclusive semileptonic B- meson decays for (lepton is electron ,muon , tau) are investigated in the context of the Standard Model.The differential branching ratio, forward-backward asymmetry ,CP &ndash<br>violating asymmetry and CP &ndash<br>violating
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43

Coniavitis, Elias. "Charged Higgs Bosons at the ATLAS Experiment and Beyond." Doctoral thesis, Uppsala universitet, Högenergifysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-111576.

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In the ATLAS experiment at the Large Hadron Collider (LHC) at CERN, direct searches for the elusive Higgs boson will be conducted, as well as for physics beyond the Standard Model. The charged Higgs boson (H±) is interesting both as a part of the Higgs sector, and as a clear sign of new physics. This thesis focuses on H± searches, with H± production in top-antitop pair events, and in particular the  bW± bH±, H±→τhadν, W±→qq channel. Its potential was investigated  as  part of a larger study of the expected performance of the entire ATLAS experiment. Full simulation of the ATLAS detector and tr
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44

Alpigiani, Cristiano. "Search for rare B decays into two muons with the ATLAS detector." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8922.

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The impressive progress that elementary particle physics made in the second half of the last century led to the formulation of a comprehensive theory, known as the Standard Model (SM), which correctly describes all fundamental interactions in nature, except for the gravitational one. Indirect discoveries have always played an important role in high energy physics scenario and indirect research can be considered to all intents and purposes complementary to the direct one, since allows to test much higher energy scales than those the current colliders are able to reach. This is very important no
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45

Netto, Dorival Gonçalves. "Sinais de produção de novos bósons vetoriais no LHC." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26042010-141529/.

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Neste trabalho realizamos uma abordagem fenomenológica da observação de novos bósons de spin-1 associados ao setor de Quebra de Simetria Eletrofraca. Como motivação a essa análise estudamos primeiramente o caso especial de modelos baseados no mecanismo de Quebra espontânea de Simetria por Condições de Contorno, os quais também apresentam uma torre de bósons vetoriais de Kaluza-Klein assegurando a unitariedade no espalhamento entre bósons gauge. Na análise fenomenológica efetuamos uma abordagem independente de modelo analisando o potencial do Large Hadron Collider (LHC) na detecção de novo
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46

Kanik, Inanc. "Light Cone Qcd Sum Rules And Meson Physics." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610082/index.pdf.

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In this thesis, we applied Light Cone QCD sum rules (LCSR) to several problems in meson physics. Semileptonic B-&gt<br>eta l v decays are important to get information on Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. We calculated form factors of this decay in LCSR frame. Our results are confirmed by later studies and these similar studies had been used for enhancing result on b to u quark transition matrix element of CKM matrix by BaBar collaboration. We used LCSR method also for calculating coupling constant of radiative rho -&gt<br>eta photon decay since the analysis of the vector particl
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47

Hansson, Per. "First Determination of the Electric Charge of the Top Quark and Studies of the Top Quark Pair Background to New Physics." Doctoral thesis, Stockholm : Particle and astroparticle physics, Department of physics, Royal institute of technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4870.

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48

Zimmer, Stephan. "Charged Higgs Boson Studies in the Channel pp→a1h±→4b+l+MET in the Next-to MSSM (NMSSM) with the ATLAS Experiment." Thesis, Uppsala University, High Energy Physics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-119324.

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<p>Next-to-minimal super-symmetric extensions of the Standard Model (SM) predict the existence of several non-SM like Higgs bosons. The process pp→a<sub>1</sub>h<sup>±</sup>→4b+W involves the production and the decay of a spin-0 charged Higgs boson and a CP-odd Higgs boson a<sub>1</sub> which can have a sizable cross section in the NMSSM. The invariant masses of these intermediate bosons can be reconstructed from the four momenta of the final state particles using mass minimization algorithms. This thesis presents a cut-based analysis of two mass scenarios and specialized algorithms that are c
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49

Zimmer, Stephan. "Charged Higgs Boson Studies in the Channel pp→a1h±→4b+l+MET in the Next-to MSSM (NMSSM) with the ATLAS Experiment." Thesis, Uppsala universitet, Högenergifysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-119324.

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Next-to-minimal super-symmetric extensions of the Standard Model (SM) predict the existence of several non-SM like Higgs bosons. The process pp→a1h±→4b+W involves the production and the decay of a spin-0 charged Higgs boson and a CP-odd Higgs boson a1 which can have a sizable cross section in the NMSSM. The invariant masses of these intermediate bosons can be reconstructed from the four momenta of the final state particles using mass minimization algorithms. This thesis presents a cut-based analysis of two mass scenarios and specialized algorithms that are capable of recovering the signal in a
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50

McBride, Sachiko Toda. "Measurement of the Zγγ production cross section at proton-proton collisions with the CMS experiment". Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32204.

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Doctor of Philosophy<br>Department of Physics<br>Yurii Y. Maravin<br>This thesis presents the first study of a rare production of Z boson in association with two photons (Zγγ), where the Z boson decays into a pair of muons or electrons, by proton-proton collisions at the Large Hadron Collider (LHC). This study uses full data samples that have been collected with the Compact Muon Solenoid (CMS) detector in 2012 with a center of mass energy of 8TeV, corresponding to an integrated luminosity of 19.7 fb⁻¹. The Zγγ production cross section is measured within a fiducial region defined by two leptons
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