Download or read book Challenges for MSSM Higgs Searches at Hadron Colliders written by and published by . This book was released on 2007 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this article we analyze the impact of B-physics and Higgs physics at LEP on standard and non-standard Higgs bosons searches at the Tevatron and the LHC, within the framework of minimal flavor violating supersymmetric models. The B-physics constraints we consider come from the experimental measurements of the rare B-decays b → s? and B{sub u} → ?? and the experimental limit on the B{sub s} → ?+?− branching ratio. We show that these constraints are severe for large values of the trilinear soft breaking parameter A{sub t}, rendering the non-standard Higgs searches at hadron colliders less promising. On the contrary these bounds are relaxed for small values of A{sub t} and large values of the Higgsino mass parameter ?, enhancing the prospects for the direct detection of non-standard Higgs bosons at both colliders. We also consider the available ATLAS and CMS projected sensitivities in the standard model Higgs search channels, and we discuss the LHC's ability in probing the whole MSSM parameter space. In addition we also consider the expected Tevatron collider sensitivities in the standard model Higgs h → b{bar b} channel to show that it may be able to find 3 ? evidence in the B-physics allowed regions for small or moderate values of the stop mixing parameter.

Download or read book Suggestions for Benchmark Scenarios for MSSM Higgs Boson Searches at Hadron Colliders written by and published by . This book was released on 2002 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book B Constraints and Higgs Searches at Hadron Colliders in the MSSM written by Arjun Menon and published by . This book was released on 2007 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Hadron Collider Phenomenology written by M. Kramer and published by CRC Press. This book was released on 2004-09-30 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the Large Hadron Collider (LHC) under construction and due to come online in 2007, it is appropriate to engage in a focused review on LHC phenomenology. At a time when most of the experimental effort is centered on detector construction and software development, it is vitally important to direct the experimental community and, in particular, new researchers on the physics phenomena expected from the LHC. Large Hadron Collider Phenomenology covers the capabilities of LHC, from searches for the Higgs boson and physics beyond the standard model to detailed studies of quantum chromodynamics, the B-physics sectors, and the properties of hadronic matter at high energy density as realized in heavy-ion collisions. Written by experienced researchers and experimentalists, this reference examines the basic properties and potentials of the machine, detectors, and software required for physics analyses. The book starts with a basic introduction to the standard model and its applications to the phenomena observed at high energy collisions. Later chapters describe the key technological challenges facing the construction of the LHC machine, the operating detectors of the LHC, and the vast computing grid needed to analyze the data. In the final sections, the contributors discuss the quark-gluon plasma (QGP), explore questions and predictions for the LHC program, and examine the physics opportunities of the LHC using information from the forward region. By surveying the difficult challenges of the LHC development while also assessing the novel processes that the LHC will perform, Large Hadron Collider Phenomenology aids less seasoned physicists as well as existing researchers in discovering the numerous possibilities of the LHC.

Download or read book Higgs Boson Searches at Hadron Colliders 1 4 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In these Academic Training lectures, the phenomenology of Higgs bosons and search strategies at hadron colliders are discussed. After a brief introduction on Higgs bosons in the Standard Model and a discussion of present direct and indirect constraints on its mass the status of the theoretical cross section calculations for Higgs boson production at hadron colliders is reviewed. In the following lectures important experimental issues relevant for Higgs boson searches (trigger, measurements of leptons, jets and missing transverse energy) are presented. This is followed by a detailed discussion of the discovery potential for the Standard Model Higgs boson for both the Tevatron and the LHC experiments. In addition, various scenarios beyond the Standard Model, primarily the MSSM, are considered. Finally, the potential and strategies to measured Higgs boson parameters and the investigation of alternative symmetry breaking scenarios are addressed.

Download or read book Phenomenology of the Higgs at the Hadron Colliders written by Julien Baglio and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis has been conducted in the context of one of the utmost important searches at current hadron colliders, that is the search for the Higgs boson, the remnant of the electroweak symmetry breaking. We wish to study the phenomenology of the Higgs boson in both the Standard Model (SM) framework and its minimal Supersymmetric extension (MSSM). After a review of the Standard Model in a first part and of the key reasons and ingredients for the supersymmetry in general and the MSSM in particular in a third part, we will present the calculation of the inclusive production cross sections of the Higgs boson in the main channels at the two current hadron colliders that are the Fermilab Tevatron collider and the CERN Large Hadron Collider (LHC), starting by the SM case in the second part and presenting the MSSM results, where we have five Higgs bosons and focusing on the two main production channels that are the gluon gluon fusion and the bottom quarks fusion, in the fourth part. The main output of this calculation is the extensive study of the various theoretical uncertainties that affect the predictions: the scale uncertainties which probe our ignorance of the higher-order terms in a fixed order perturbative calculation, the parton distribution functions (PDF) uncertainties and its related uncertainties from the value of the strong coupling constant, and the uncertainties coming from the use of an effective field theory to simplify the hard calculation. We then move on to the study of the Higgs decay branching ratios which are also affected by diverse uncertainties. We will present the combination of the production cross sections and decay branching fractions in some specific cases which will show interesting consequences on the total theoretical uncertainties. We move on to present the results confronted to experiments and show that the theoretical uncertainties have a significant impact on the inferred limits either in the SM search for the Higgs boson or on the MSSM parameter space, including some assessments about SM backgrounds to the Higgs production and how they are affected by theoretical uncertainties. One significant result will also come out of the MSSM analysis and open a novel strategy search for the Standard Higgs boson at the LHC. We finally present in the last part some preliminary results of this study in the case of exclusive production which is of utmost interest for the experimentalists.

Download or read book The Interplay Between Collider Searches For Supersymmetric Higgs Bosons and Direct Dark Matter Experiments written by and published by . This book was released on 2006 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this article, we explore the interplay between searches for supersymmetric particles and Higgs bosons at hadron colliders (the Tevatron and the LHC) and direct dark matter searches (such as CDMS, ZEPLIN, XENON, EDELWEISS, CRESST, WARP and others). We focus on collider searches for heavy MSSM Higgs bosons (A, H, H{sup {+-}}) and how the prospects for these searches are impacted by direct dark matter limits and vice versa. We find that the prospects of these two experimental programs are highly interrelated. A positive detection of A, H or H{sup {+-}} at the Tevatron would dramatically enhance the prospects for a near future direct discovery of neutralino dark matter. Similarly, a positive direct detection of neutralino dark matter would enhance the prospects of discovering heavy MSSM Higgs bosons at the Tevatron or the LHC. Combining the information obtained from both types of experimental searches will enable us to learn more about the nature of supersymmetry.

Download or read book Searching for MSSM Higgs Bosons at Ee mu mu and gamma gamma Colliders written by James G. Kelly and published by . This book was released on 1996 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electroweak Symmetry Breaking And New Physics At The Tev Scale written by Timothy L Barklow and published by World Scientific. This book was released on 1997-05-05 with total page 749 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an expanded version of the report by the Electroweak Symmetry Breaking and Beyond the Standard Model Working Group which was contributed to Particle Physics — Perspectives and Opportunities, a report of the Division of Particles and Fields Committee for Long Term Planning. One of the Working Group's primary goals was to study the phenomenology of electroweak symmetry breaking and attempt to quantify the “physics reach” of present and future colliders. Their investigations encompassed the Standard Model — with one doublet of Higgs scalars — and approaches to physics beyond the Standard Model. These include models of low-energy supersymmetry, dynamical electroweak symmetry breaking, and a variety of extensions of the Standard Model with new particles and interactions. The Working Group also considered signals of new physics in precision measurements arising from virtual processes and examined experimental issues associated with the study of electroweak symmetry breaking and the search for new physics at present and future hadron and lepton colliders.This volume represents an important contribution to the efforts being made to advance the frontiers of particle physics.

Download or read book Probing Higgs Bosons Signatures written by Cristobal Cuenca Almenar and published by LAP Lambert Academic Publishing. This book was released on 2010-02 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Even if the Standard Model of particle physics has proven to be one of the most accurate descriptions of nature ever devised by human beings, some limitations point towards the idea that it is a low energy effective theory. Supersymmetry is a newer theoretical framework, thought to overcome the problems found with the Standard Model while preserving all its predictive power. The model with a minimal supersymmetric content in the Higgs sector is know as Minimal Supersymmetric Extension of the Standard Model, MSSM. The analysis presented in this dissertation focuses on the search for neutral MSSM Higgs bosons at the Tevatron, a hadron collider operating at Fermilab, USA. This accelerator provides proton-antiproton collisions with a center of mass energy of 1.96 TeV. CDF is one of the detectors built to record and analyze the products of the collisions provided by the Tevatron. The sensitivity achieved by this analysis is rooted on the robustness of the description of the different backgrounds and the boldness of the method for tau reconstruction. The results presented are currently the most stringent limits in the MSSM parameter space.

Download or read book Higgs Boson Physics Beyond the Standard Model written by Yun Jiang and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Prospects for Charged Higgs Boson Searches at the Large Hadron Collider with Early ATLAS Data written by Jenna Louise Lane and published by . This book was released on 2010 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prospects for Charged Higgs Boson Searches at the Large Hadron Collider with Early ATLAS Data written by Jenna Louise Lane and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Exploring the Large Hadron Collider The Discovery of the Higgs Particle written by Michael Hauschild and published by Springer Nature. This book was released on 2021 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Michael Hauschild takes the reader of this essential back to the year 2012, when the discovery of the Higgs particle was announced at CERN, the European Organization for Nuclear Research near Geneva, Switzerland. The author vividly explains the Higgs mechanism for mass generation with the central role of the Higgs particle in current particle physics and the long hunt for its discovery at the Large Hadron Collider LHC. After a stop of more than two years, the LHC, the world‘s largest particle accelerator was put back into operation in spring 2015 to discover the secrets of nature at higher energy than ever before. An overview of future projects concludes this essential. This Springer essential is a translation of the original German 1st edition essentials, Neustart des LHC: die Entdeckung des Higgs-Teilchens by Michael Hauschild, published by Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2018. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically different from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors. The Content Mass does it! - How the particles get their mass From UFOs and more! - The LHC goes into the next round The plan of the century! - Higgs, what next? The Target groups Scientifically interested laymen and students Lecturers and students of the Studium Generale and the natural sciences The Author Dr. Michael Hauschild is a particle physicist at CERN in Geneva and has been a member of the ATLAS experiment at the Large Hadron Collider LHC since 2005. During the first long measurement period of the LHC from 2010 to 2012, he witnessed the discovery of the Higgs particle in summer 2012.

Download or read book Search for the totally Unexpected in the LHC Era written by Antonino Zichichi and published by World Scientific. This book was released on 2010 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beyond Higgs / W.A. Bardeen -- Is N = 8 supergravity ultraviolet finite? / Z. Bern -- Extremal black holes and attractors / S. Ferrara -- Exotic mesons / L. Maiani -- The entropic principle and the landscape in SUSY gauge theories / H. Ooguri -- Warped dimensions / L. Randall -- Unitarity in the Brout-Englert-Higgs mechanism for gravity / C. 'tHooft -- AdS/CFT and light-front QCD / S.J. Brodsky -- Physics of the light quarks / H. Leutwyler -- BFKL equation and anomalous dimensions in N = 4 SUSY / L.N. Lipatov -- The color glass condensate and the glasma / L. McLerran -- Highlights from CERN / R. Aymar -- Highlights from Gran Sasso / E. Coccia -- Highlights from the CNGS & OPERA / Y. Declais -- Highlights from RHIC / B. Jacak -- Highlights from fermilab / P.J. Oddone -- Problems with three neutrinos / A. Bettini -- Double beta decay / E. Fiorini -- Rare decays in the 3rd family / M. Giorgi -- Cosmology and the unexpected / E.W. Kolb -- Complexity at the fundamental level : consequences for LHC / A. Zichichi -- Vertexing and flavour tagging at the international linear collider / E. Devetak -- The standard model Higgs search at the tevatron / W. Fisher -- Effective potentials in de Sitter background and application to the MSSM / B. Garbrecht -- Tuning the vertex detector simulation of H1 / M. Kramer -- Numerical calculation of electron g-2 at 4 loops in QED / S. Laporta -- Spinors and unitarity-cuts / P. Mastrolia -- Exploring the physics frontier with v[symbol]'s and v[symbol]'s in MINOS / J.P. Ochoa-Ricoux -- Modified dispersion relations and trans-planckian physics / M. Rinaldi -- A large TPC prototype for the international linear collider / P. Schade -- Lepton flavour violation : hints on the SUSY seesaw / A.M. Teixeira -- Background simulations for the international linear collider / A. Vogel -- A hadronic calorimeter for the international linear collider / N. Wattimena

Download or read book Search for Higgs Bosons at LEP and Hadron Colliders written by Thomas M. Trefzger and published by . This book was released on 2001 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for Beyond the Standard Model Physics at the CMS Experiment written by Leonardo Sala and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: