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Author: Publisher: ISBN: Category : Languages : en Pages : 3
Book Description
Despite its tremendous success in describing the available high energy physics data to high precision, the standard model (SM) of particle physics is known to be incomplete. The most popular extension of the SM is supersymmetry. It provides elegant solutions to various problems of the SM, e.g. the fact that in the SM the mass of the Higgs boson is sensitive to large radiative corrections driving its mass to the Planck scale. The reported results are based on data samples of proton-antiproton collisions at a center-of-mass energy of (square root)s = 1.96 TeV provided by the Tevatron. The analyzed data is recorded by the D0 detector [1]. All reported limits are calculated at the 95% confidence level (CL) based on the modified frequentist approach [2]. Recent searches by the D0 collaboration for Higgs bosons in extensions of the Standard Model at the Tevatron are reported with emphasis on neutral Higgs bosons in supersymmetry.
Author: Publisher: ISBN: Category : Languages : en Pages : 3
Book Description
Despite its tremendous success in describing the available high energy physics data to high precision, the standard model (SM) of particle physics is known to be incomplete. The most popular extension of the SM is supersymmetry. It provides elegant solutions to various problems of the SM, e.g. the fact that in the SM the mass of the Higgs boson is sensitive to large radiative corrections driving its mass to the Planck scale. The reported results are based on data samples of proton-antiproton collisions at a center-of-mass energy of (square root)s = 1.96 TeV provided by the Tevatron. The analyzed data is recorded by the D0 detector [1]. All reported limits are calculated at the 95% confidence level (CL) based on the modified frequentist approach [2]. Recent searches by the D0 collaboration for Higgs bosons in extensions of the Standard Model at the Tevatron are reported with emphasis on neutral Higgs bosons in supersymmetry.
Author: Giulia Di Gregorio Publisher: Springer Nature ISBN: 3031200136 Category : Science Languages : en Pages : 229
Book Description
The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The search for the Higgs boson is one of the main goals in High Energy Physics and one of the highest priorities at Run II of the Tevatron. There are many alternative Higgs boson models beyond the SM, including Supersymmetry (SUSY) and Fermiophobic Higgs bosons, which can actively be probed at the Tevatron, and in the absence of an excess constrained. The latest limits for several SUSY searches are presented in Section 2 and for the Fermiophobic Higgs boson searches in Section 3. More information on all these searches, along with the latest results, can be found on the CDF and D0 public results webpages. Results are presented for beyond the Standard Model Higgs boson searches using up to 4.2 fb−1 of data from Run II at the Tevatron. No significant excess is observed in any of the channels so 95% confidence level limits are presented.
Author: Marc Christopher Thomas Publisher: Springer ISBN: 3319434527 Category : Science Languages : en Pages : 113
Book Description
This thesis studies collider phenomenology of physics beyond the Standard Model at the Large Hadron Collider (LHC). It also explores in detail advanced topics related to Higgs boson and supersymmetry – one of the most exciting and well-motivated streams in particle physics. In particular, it finds a very large enhancement of multiple Higgs boson production in vector-boson scattering when Higgs couplings to gauge bosons differ from those predicted by the Standard Model. The thesis demonstrates that due to the loss of unitarity, the very large enhancement for triple Higgs boson production takes place. This is a truly novel finding. The thesis also studies the effects of supersymmetric partners of top and bottom quarks on the Higgs production and decay at the LHC, pointing for the first time to non-universal alterations for two main production processes of the Higgs boson at the LHC–vector boson fusion and gluon–gluon fusion. Continuing the exploration of Higgs boson and supersymmetry at the LHC, the thesis extends existing experimental analysis and shows that for a single decay channel the mass of the top quark superpartner below 175 GeV can be completely excluded, which in turn excludes electroweak baryogenesis in the Minimal Supersymmetric Model. This is a major new finding for the HEP community. This thesis is very clearly written and the introduction and conclusions are accessible to a wide spectrum of readers.
Author: Daniel Salerno Publisher: Springer Nature ISBN: 3030312577 Category : Science Languages : en Pages : 207
Book Description
The work presented in this PhD dissertation is the first search at CMS for Higgs bosons produced in association with top quarks (ttH) in a final state consisting of only jets. The results presented in this book uncover a new class of ttH events that will help us elucidate our understanding of the Yukawa sector interactions between the Higgs boson and the top quark. Despite this being the most common decay signature for ttH, a large contamination of SM backgrounds makes it the most challenging for extracting a signal from data. The PhD thesis presents many sophisticated tools and techniques that were developed in order to overcome these challenges. These tools pave the way for future analyses to investigate other standard model and beyond-standard model physics.
Author: Yun Jiang Publisher: ISBN: 9781339542393 Category : Languages : en Pages :
Book Description
The discovery of a new particle with mass of about 125 GeV was a real triumph of run-1 of the Large Hadron Collider (LHC). To date, the analysis of the full data collected clearly shows that its properties match very well those expected for the Higgs boson in the Standard Model (SM). However, the SM itself leaves many serious questions unsolved and cannot completely describe all the observed phenomena. Hence, it must be only a component of a more complete theory. Theories that go beyond the SM typically require an extended Higgs sector. Although stringently constrained by the LHC run-1 data, a non-minimal Higgs sector is theoretically very attractive and, if confirmed, would shine light on the mechanism of electroweak symmetry breaking (EWSB). Followed by a historical review of the birth of the Higgs boson, this volume supplies a brief introduction to SM Higgs boson physics and topical issues on Higgs searches at the LHC. An updated overview of the property analysis for the newly-discovered 125 GeV Higgs and other beyond-the-SM (BSM) Higgs bosons will be presented. We will also discuss its implications for various BSM Higgs models without and within the framework of supersymmetry (SUSY). The two-Higgs-doublet model (2HDM) is a very simple and appealing framework for such considerations. Either of the two CP-even Higgs bosons in the Type I and II 2HDM is able to provide a consistent description of the LHC Higgs signal. I will illustrate its status after LHC run-1 analysis and present the prediction for higher precision at the run-2. Given the very SM-like nature of this discovered particle, one often considers the decoupling limit in which the lightest one is the SM-like Higgs boson discovered at the LHC while others are very heavy. However, such a SM-like scalar Higgs boson can also be obtained in the alignment limit without the masses of other Higgs being large. In particular, I will address the seemingly extreme case in which there is a (pseudoscalar) Higgs light enough so that the SM-like state would have a rare decay mode. Finally, the results achieved in the case of alignment will be compared to those present in the decoupling limit and the prospects for searching for non-SM Higgs bosons at future experiments will be discussed in detail.In the framework of supersymmetry, the next-to-minimal supersymmetric SM (NMSSM) that has been widely studied is a most promising possibility because it allows for less fine-tuning. Following an analysis of the theoretical structure of this model, we first assessed the extent to which various semi-constrained NMSSM (scNMSSM) scenarios with one of the CP-even Higgs bosons, h1 (the lightest) or h2 (the second lightest), are able to describe the LHC signal as a SM-like Higgs. Meanwhile, if the h1 and h2 are approximately degenerate in mass then an enhancement of the di-photon signal is very possible, although a SM-like level is also easily achieved. To experimentally probe the possibility of degeneracy, we developed diagnostic tools that could discriminate whether or not there are two (or more) Higgs bosons versus just one contributing to the LHC signals at 125 GeV. In addition, we considered the case where the h1 provides a consistent description of the small LEP excess at 98 GeV whereas the h2 possesses the primary features of the LHC Higgs-like signals at 125 GeV. Beyond the SM, the Higgs sector and dark matter (DM) sector may be intimately connected. With protection by an extra discrete symmetry, a certain non-SM scalar boson (Higgs partner) could be a possible DM candidate. As typical examples, we consider the lightest neutralino supersymmetric DM and the Higgs-portal scalar DM in the singlet extension of the 2HDM (2HDMS) together with presenting a decent description of the models. In both cases, implications for DM physics are discussed in various scenarios. Intriguingly, violating the isospin symmetry in the DM interaction with nucleons could result in a large suppression of the DM-nucleon cross section, approaching a level that is hardly reachable by many ambitious projects for DM direct detection. Given this dramatic change in the analysis of DM direct detection, I include an in-depth examination of this possibility in the generic Higgs-portal DM model.
Author: Aleandro Nisati Publisher: World Scientific ISBN: 981442546X Category : Science Languages : en Pages : 470
Book Description
The recent observation of the Higgs boson has been hailed as the scientific discovery of the century and led to the 2013 Nobel Prize in physics. This book describes the detailed science behind the decades-long search for this elusive particle at the Large Electron Positron Collider at CERN and at the Tevatron at Fermilab and its subsequent discovery and characterization at the Large Hadron Collider at CERN. Written by physicists who played leading roles in this epic search and discovery, this book is an authoritative and pedagogical exposition of the portrait of the Higgs boson that has emerged from a large number of experimental measurements. As the first of its kind, this book should be of interest to graduate students and researchers in particle physics.
Author: Siyuan Chen Publisher: GRIN Verlag ISBN: 3656745293 Category : Science Languages : en Pages : 30
Book Description
Bachelor Thesis from the year 2013 in the subject Physics - Theoretical Physics, grade: 71 points, King`s College London, language: English, abstract: An overview of the steps that lead to the discovery of the Higgs boson is presented. Starting with the theoretical background framework, the Standard Model of particel physics, the Higgs field will be introduced as an addition. This extra field provides the mechanism for spontaneous symmetry breaking, that is needed to explain the existence of massive particles. An overview of the steps of the experimental search to the discovery of the Higgs boson is given in the second part of this article. Its mass has been measured to be 125.4 ± 0.4(stat) ± 0.5(sys) GeV. The Standard Model is briefly summarised. The Higgs mechanism is derived from an Abelian Model, applied to the gauge bosons of the electroweak model of Weinberg and Salam. A simple estimate of the Higgs mass is given by its derivation and the estimation of its self-coupling and vacuum expectation value. Experimental results will be presented from the CMS and ATLAS detectors at the LHC, alongside with a description of the Large Hadron Collider at CERN and possible directions for future experiments beyond the Standard Model.
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Author: Giulia Di Gregorio
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Author: Marc Christopher Thomas
Author: Daniel Salerno
Author: Martin B. Einhorn
Author: Yun Jiang
Author: Aleandro Nisati
Author: Siyuan Chen
Author: Miika Anttoni Klemetti