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Implications Of The Lhc Two Photon Signal For Two Higgs Doublet Models
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Book Synopsis Implications of the LHC Two-photon Signal for Two-Higgs-doublet Models by :
Download or read book Implications of the LHC Two-photon Signal for Two-Higgs-doublet Models written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the implications for Two Higgs Doublet Models of the recent announcement at the LHC giving a tantalizing hint for a Higgs boson of mass 125 GeV decaying into two photons. We require that the experimental result be within a factor of two of the theoretical Standard Model prediction, and analyze the type I and type II models as well as the lepton-specific and flipped models, subject to this requirement. It is assumed that there is no new physics other than two Higgs doublets. In all of the models, we display the allowed region of parameter space taking the recent LHC announcement at face value, and we analyze the WW−, ZZ, {bar b}b and?+?− expectations in these allowed regions. Throughout the entire range of parameter space allowed by the?? constraint, the number of events for Higgs decays into WW, ZZ and b{bar b} are not changed from the Standard Model by more than a factor of two. In contrast, in the Lepton Specific model, decays to?+?− are very sensitive across the entire??-allowed region.
Book Synopsis Higgs Boson Physics Beyond the Standard Model by : Yun Jiang
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.
Book Synopsis The Higgs Hunter's Guide by : John F. Gunion
Download or read book The Higgs Hunter's Guide written by John F. Gunion and published by CRC Press. This book was released on 2018-03-05 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Higgs Hunter's Guide is a definitive and comprehensive guide to the physics of Higgs bosons. In particular, it discusses the extended Higgs sectors required by those recent theoretical approaches that go beyond the Standard Model, including supersymmetry and superstring-inspired models.
Book Synopsis The Electroweak Phase Transition in Two-Higgs-doublet Models and Implications for LHC Searches by : Gláuber Carvalho Dorsch
Download or read book The Electroweak Phase Transition in Two-Higgs-doublet Models and Implications for LHC Searches written by Gláuber Carvalho Dorsch and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Perspectives on LHC Physics by : Aaron Pierce
Download or read book Perspectives on LHC Physics written by Aaron Pierce and published by World Scientific. This book was released on 2008 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Large Hadron Collider (LHC), located at CERN, Geneva, Switzerland, is the world's largest and highest energy and highest intensity particle accelerator. This book provides an overview on the techniques that will be crucial for finding new physics at the LHC, as well as perspectives on the importance and implications of the discoveries. Among the contributors to this book are leaders and visionaries in the field of particle physics beyond the Standard Model, including two Nobel Laureates (Steven Weinberg and Frank Wilczek), and presumably some future Nobel Laureates, plus top younger theorists and experimenters.
Book Synopsis Photon Physics at the LHC by : Michael Hance
Download or read book Photon Physics at the LHC written by Michael Hance and published by Springer Science & Business Media. This book was released on 2012-11-08 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports on the first studies of Standard Model photon production at the Large Hadron Collider (LHC) using the ATLAS detector. Standard Model photon production is a large background in the search for Higgs bosons decaying into photon pairs, and is thus critical to understand. The thesis explains the techniques used to reconstruct and identify photon candidates using the ATLAS detector, and describes a measurement of the production cross section for isolated prompt photons. The thesis also describes a search for the Higgs boson in which the analysis techniques used in the measurement are exploited to reduce and estimate non-prompt backgrounds in diphoton events.
Book Synopsis Higgs, Supersymmetry and Dark Matter After Run I of the LHC by : Béranger Dumont
Download or read book Higgs, Supersymmetry and Dark Matter After Run I of the LHC written by Béranger Dumont and published by Springer. This book was released on 2016-09-21 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work was nominated as an outstanding PhD thesis by the LPSC, Université Grenoble Alpes, France. The LHC Run 1 was a milestone in particle physics, leading to the discovery of the Higgs boson, the last missing piece of the so-called "Standard Model" (SM), and to important constraints on new physics, which challenge popular theories like weak-scale supersymmetry. This thesis provides a detailed account of the legacy of the LHC Run 1 ≤¥regarding these aspects. First, the SM and the need for its extension are presented in a concise yet revealing way. Subsequently, the impact of the LHC Higgs results on scenarios of new physics is assessed in detail, including a careful discussion of the relevant uncertainties. Two approaches are considered: generic modifications of the Higgs couplings, possibly arising from extended Higgs sectors or higher-dimensional operators; and tests of specific new physics models. Lastly, the implications of the null results of the searches for new physics are discussed with a particular focus on supersymmetric dark matter candidates. Here as well, two approaches are presented: the "simplified models" approach, and recasting by event simulation. This thesis stands out for its educational approach, its clear language and the depth of the physics discussion. The methods and tools presented offer readers essential practical tools for future research.
Book Synopsis Resonance-continuum Interference in the Di-photon Higgs Signal at the LHC. by :
Download or read book Resonance-continuum Interference in the Di-photon Higgs Signal at the LHC. written by and published by . This book was released on 2003 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A low mass Standard Model Higgs boson should be visible at the Large Hadron Collider through its production via gluon-gluon fusion and its decay to two photons. We compute the interference of this resonant process, gg → H → [gamma][gamma], with the continuum QCD background, gg → [gamma][gamma] induced by quark loops. Helicity selection rules suppress the effect, which is dominantly due to the imaginary part of the two-loop gg → [gamma][gamma] scattering amplitude. The interference is destructive, but only of order 5% in the Standard Model, which is still below the 10-20% present accuracy of the total cross section prediction. We comment on the potential size of such effects in other Higgs models.
Book Synopsis The Impact of the Two-Higgs-Doublet Model on Selected B-physics Processes by : Dario Müller
Download or read book The Impact of the Two-Higgs-Doublet Model on Selected B-physics Processes written by Dario Müller and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two-photon Physics written by F. Kapusta and published by World Scientific. This book was released on 1994 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phenomenology of Two-Higgs-doublet Models in the LHC Era by : Universitat de València. Facultat de Física
Download or read book Phenomenology of Two-Higgs-doublet Models in the LHC Era written by Universitat de València. Facultat de Física and published by . This book was released on 2014 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lectures on LHC Physics by : Tilman Plehn
Download or read book Lectures on LHC Physics written by Tilman Plehn and published by Springer. This book was released on 2014-08-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the discovery of the Higgs boson, the LHC experiments have closed the most important gap in our understanding of fundamental interactions, confirming that such interactions between elementary particles can be described by quantum field theory, more specifically by a renormalizable gauge theory. This theory is a priori valid for arbitrarily high energy scales and does not require an ultraviolet completion. Yet, when trying to apply the concrete knowledge of quantum field theory to actual LHC physics - in particular to the Higgs sector and certain regimes of QCD - one inevitably encounters an intricate maze of phenomenological know-how, common lore and other, often historically developed intuitions about what works and what doesn’t. These lectures cover three aspects to help understand LHC results in the Higgs sector and in searches for physics beyond the Standard Model: they discuss the many facets of Higgs physics, which is at the core of this significantly expanded second edition; then QCD, to the degree relevant for LHC measurements; as well as further standard phenomenological background knowledge. They are intended to serve as a brief but sufficiently detailed primer on LHC physics to enable graduate students and all newcomers to the field to find their way through the more advanced literature, and to help those starting to work in this very timely and exciting field of research. Advanced readers will benefit from this course-based text for their own lectures and seminars. .
Book Synopsis Electroweak Interactions and Unified Theories by : J. Thanh Van Tran
Download or read book Electroweak Interactions and Unified Theories written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1988 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constraining Supersymmetric Models by : Lisa Zeune
Download or read book Constraining Supersymmetric Models written by Lisa Zeune and published by Springer. This book was released on 2015-10-22 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis analyses how supersymmetric (SUSY) extensions of the Standard Model (SM) of particle physics can be constrained using information from Higgs physics, electroweak precision observables and direct searches for new particles. Direct searches for SUSY particles at the LHC have not resulted in any signal so far, and limits on the SUSY parameter space have been set. Measurements of the properties of the observed Higgs boson at 125 GeV as well as of the W boson mass can provide valuable indirect constraints, supplementing the ones from direct searches. Precise calculations are performed for Higgs decays and electroweak precision observables within the minimal supersymmetric extension of the Standard Model and the next to-minimal supersymmetric extension of the Standard Model. Furthermore, a method is presented to reinterpret the LHC limits from direct SUSY searches in more realistic SUSY scenarios. The phenomenological consequences of those results are thoroughly analysed.
Book Synopsis Flavor changing neutral decay effects in models with two Higgs boson doublets[ by : Santi Béjar Latonda
Download or read book Flavor changing neutral decay effects in models with two Higgs boson doublets[ written by Santi Béjar Latonda and published by . This book was released on 2005 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lepton Dipole Moments by : B. Lee Roberts
Download or read book Lepton Dipole Moments written by B. Lee Roberts and published by World Scientific. This book was released on 2010 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a self-contained description of the measurements of the magnetic dipole moments of the electron and muon, along with a discussion of the measurements of the fine structure constant, and the theory associated with magnetic and electric dipole moments. Also included are the searches for a permanent electric dipole moment of the electron, muon, neutron and atomic nuclei. The related topic of the transition moment for lepton flavor violating processes, such as neutrinoless muon or tauon decays, and the search for such processes are included as well. The papers, written by many of the leading authors in this field, cover both the experimental and theoretical aspects of these topics. Sample Chapter(s). Chapter 1: Historical Introduction to Electric and Mangnetic Moments (367 KB). Contents: Historical Introduction (B L Roberts); Electromagnetic Dipole Moments and New Physics (A Czarnecki & W J Marciano); Lepton g OCo 2 from 1947 to Present (T Kinoshita); Analytic QED Calculations of the Anomalous Magnetic Moment of the Electron (S Laporta & E Remiddi); Measurements of the Electron Magnetic Moment (G Gabrielse); Determining the Fine Structure Constant (G Gabrielse); Helium Fine Structure Theory for the Determination of (K Pachucki & J Sapirstein); Hadronic Vacuum Polarization and the Lepton Anomalous Magnetic Moments (M Davier); The Hadronic Light-by-Light Contribution to a, e (J Prades et al.); General Prescriptions for One-loop Contributions to a e, (K R Lynch); Measurement of the Muon ( g OCo 2) Value (J P Miller et al.); Muon ( g OCo 2) and Physics Beyond the Standard Model (D StAckinger); Probing CP Violation with Electric Dipole Moments (M Pospelov & A Ritz); The Electric Dipole Moment of the Electron (E D Commins & D DeMille); Neutron EDM Experiments (S K Lamoreaux & R Golub); Nuclear Electric Dipole Moments (W C Griffith et al.); EDM Measurements in Storage Rings (B L Roberts et al.); Models of Lepton Flavor Violation (Y Okada); Search for the Charged Lepton-Flavor-Violating Transition Moments l OaAE l OC (Y Kuno). Readership: Researchers and graduate students in particle physics, atomic physics and nuclear physics, as well as experts working in the field
Book Synopsis Strong Coupling Gauge Theories in LHC Era by : Hidenori Fukuya
Download or read book Strong Coupling Gauge Theories in LHC Era written by Hidenori Fukuya and published by World Scientific. This book was released on 2011 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the Workshop is to have intensive discussions on both theoretical and phenomenological aspects of strong coupling gauge theories (SCGTs), with particular emphasis on the model buildings to be tested in the LHC experiments. Dynamical issues are discussed in lattice simulations and various analytical methods. This proceedings volume is a collection of the presentations made at the Workshop by many leading scientists in the field.
