Download or read book Phenomenological Studies of Minimal Extensions of Standard Model written by Nilanjana Kumar and published by . This book was released on 2016 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS and CMS experiments at the Large Hadron Collider (LHC) have confirmed the existence of the Higgs boson, the last missing piece of the Standard Model, making this era a great time to look for beyond Standard Model physics, which can explain the deficiencies in the Standard Model. The research described here is highly motivated by supersymmetry, which appears as an extension of the Standard Model. The phenomenological consequences of that are of great importance and have been reflected in this research. In the first project, the prospects for LHC discovery of a narrow resonance that decays to two Higgs bosons using the bb[macron gammagamma] final state are studied. This study is inspired by the compressed Minimal Supersymmetric Standard Model, which allows the production of stoponium (a bound state of the supersymmetric partners of the top quark and its antiquark) and its decay to Higgs boson pairs, but this study is applicable to any other di-Higgs resonance produced by gluon fusion. The cross-section needed for a 5-sigma discovery at the 14 TeV LHC for such a narrow di-Higgs resonance is estimated as a function of the integrated luminosity, using the invariant mass distributions for bb [macron] and photons. I have also found the integrated luminosity required for discovery of stoponium as a function of its mass. In my second project a viable extension of the Standard Model which incorporates vectorlike fermions near the electroweak scale has been explored. Vectorlike quarks and leptons are exotic new fermions that transform in non-chiral representations of the unbroken Standard Model gauge group. Two models are considered, in which the vectorlike leptons are weak isosinglets and isodoublets. The vectorlike leptons decay to tau leptons. I have studied the prospects for excluding or discovering vectorlike leptons using multilepton events at the LHC. If the vectorlike leptons are weak isosinglets, then discovery in multilepton states is found to be extremely challenging. The prospects for exclusion or discovery of vectorlike leptons at the LHC with existing [radical square root of] s=8 TeV data and future [radical square root] s=13 TeV data are discussed. The study of the effective potential is a very important tool to explore any physics beyond Standard Model because it tells us about vacuum stability and the relation between the Higgs vacuum expectation value and other Lagrangian parameters. In the Standard Model the effective potential gets imaginary contributions when the squared mass of the Goldstone boson is negative, and it suffers from a singularity problem when the squared mass of the Goldstone boson tends to zero. It is possible to resum the SM effective potential to remove those problems associated with Goldstone boson contributions. In my last project I have shown that one can resum the effective potential in MSSM up to two-loop order to negate the spurious contributions from the Goldstone bosons.
Download or read book The minimal supersymmetric standard model and its phenomenological implications written by Giorgio Gamberini and published by Edizioni della Normale. This book was released on 1993-10-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A way to solve the naturalness problem of the Higgs mass arising from the standard model is to introduce a new symmetry: the supersymmetry. Supersymmetry predicts, along with every particle, its supersymmetric counterpart, which has the same internal quantum numbers, the same mass (if supersymmetry is not broken) and an intrinsic angular momentum differing by half a unity from the first one. Phenomenologically it is evident that if supersymmetry does exist, it is broken. Nowadays it seems that the more realistic and phenomenologically acceptable models of supersymmetry are the minimal N=1 supergravity models. The purpose of this thesis is to study the various experimental possibilities of testing the Minimal Supersymmetric Standard Model (MSSM). Altough the MSSM is only a particular model along a wide class of possible supersymmetric extensions of the standard model, it is considered here because of its simplicity which entails strong and definite phenomenological predictions. We will show that the MSSM can indeed be fully tested in the next high-energy experiments.
Download or read book Astrophysical and Phenomenological Implications of Bound States in Extensions of the Standard Model of Particle Physics written by Lauren Marie Wozniak Pearce and published by . This book was released on 2014 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the Standard Model of particle physics has undoubtedly been an experimental success, several questions remain unresolved. In particular, the Standard Model cannot account for the observed cosmological preference for matter over dark matter, nor does it provide a viable candidate for dark matter. This motivates us to consider extensions to the Standard Model; in this thesis, we will focus on several extensions of the Standard Model in which the formation of bound states is a significant factor. We will argue that the formation of bound states produces new phenomena that can address these unsettled questions. First, we consider a strongly-coupled version of the Minimal Supersymmetric Standard Model. We demonstrate that in this model, electroweak symmetry breaking may be triggered by the presence of squark bound states which mix with the fundamental Higgs boson. Next, we show that this model has a viable phenomenology (e.g., it does not have large flavor-changing-neutral-currents or break SUC(3) symmetry). Additionally, this strongly-coupled version of the MSSM can relatively easily accommodate electroweak scale baryogenesis. Following this, we turn our attention to the possibility of dark matter bound states in asymmetric dark matter models. We first consider a simplistic scalar model and demonstrate that bound state formation can produce a detectable gamma ray excess in certain regions of parameter space. This signal is produced through the decay of the dark force mediator whose emission necessarily accompanies bound state formation. Next, we consider models in which the dark matter self-interactions are described by a broken UD (1) gauge group. We argue that in such models dark matter is generically multi-component, consisting of two species of ions along with dark atoms. We then investigate the possibility of using these self-interactions between the different species to alleviate tension between the cold dark matter paradigm and observations of dwarf galaxies, while retaining the ellipticity of larger halos. Finally, we consider the formation and growth of Q-balls (non-topological solitons) in a simplified model inspired by the MSSM. In particular models, Q-balls can trigger a phase transition once they reach a critical size. In certain regions of parameter space, small charge Q-balls can be approximated using the Bethe-Salpeter equation. This allows us to study the growth of small Q-balls; by joining this to the semi-classical regime at large charges, we can analyze their growth from individual squarks to critical size. In our simplistic model, we show that Q-balls can indeed reach critical size on cosmological time scales.
Download or read book Superstrings Unified Theories And Cosmology 1988 Proceeings Of The 1988 Summer Workshop On High Energy Physics And Cosmology written by Jogesh C Pati and published by World Scientific. This book was released on 1989-07-01 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ICTP has been holding a Summer Workshop in High Energy Physics and Cosmology since 1981. The primary goal of these workshops is to bring together active physicists from around the world, and to provide a platform where the frontier developments in the field are presented by leading workers. The atmosphere for the workshop was active and stimulating and each area was represented by leading physicists in the field.
Download or read book Beyond The Standard Model Iii written by S Godfrey and published by World Scientific. This book was released on 1993-06-25 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a critical review of the standard model and the prospects for discovering new physics. It also discusses the recent developments that have taken place in new physics theories beyond the standard model.
Download or read book Fundamental Interactions written by Alan Astbury and published by World Scientific. This book was released on 2008 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains the latest results from the field of particle physics. The contributions cover the current status of all the Large Hadron Collider (LHC) experiments, the implications of the LHC for cosmology, and the search for dark matter and nuclear astrophysics. It also includes work on the current status of the future International Linear Collider (ILC).
Download or read book Particle Theory And Phenomenology Proceedings Of Xvii International Kazimierz Meeting On Particle Physics And Of The Madison Phenomenology Symposium written by Kenneth E Lassila and published by World Scientific. This book was released on 1996-11-30 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading researchers in theoretical and experimental particle physics summarize the recent developments in their areas of expertise. There are also concentrated presentations on top quark discoveries and new theory consequences of top data.
Download or read book Fundamental Interactions Proceedings Of The 22nd Lake Louise Winter Institute written by Alan Astbury and published by World Scientific. This book was released on 2007-12-28 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains the latest results from the field of particle physics. The contributions cover the current status of all the Large Hadron Collider (LHC) experiments, the implications of the LHC for cosmology, and the search for dark matter and nuclear astrophysics. It also includes work on the current status of the future International Linear Collider (ILC).
Download or read book Physics Beyond the Standard Models of Particles Cosmology and Astrophysics written by Hans Volker Klapdor-Kleingrothaus and published by World Scientific. This book was released on 2011 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the Fifth International Conference on Physics Beyond the Standard Models of Particle Physics, Cosmology and Astrophysics. It presents a brilliant overview of the status and future potential and trends in experimental and theoretical particle physics, cosmology and astrophysics, in the complimentary sectors of accelerator, non-accelerator and space physics.
Download or read book Higgs Boson Phenomenology Beyond the Standard Model written by Solen Le Corre and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the discovery of the Higgs boson in June 2012 at the Large Hadron Collider, the particle collider located beneath the France-Switzerland border, interest in the study of the scalar sector in elementary particle physics significantly increased. In particular, as the Higgs boson plays a very special role in the Standard Model of particle physics, experimentalists study its properties with great care.The goal of the Standard Model is to describe the interactions between elementary particles. However the theory is not quite complete. Indeed, in addition to some purely theoretical problems, a number of experimental observations cannot be explained by the Standard Model. Theorists are therefore looking for a more comprehensive theory able to fully explain the observations.This thesis is based on the study of the scalar sector of two different extensions of the Standard Model of particle physics. I have worked on the Two-Higgs Doublet Model - this model is purely effective but can be included in more comprehensive theories - as well as on a model based on a combination of Technicolor and Composite Higgs theories in the framework of the SU (4) ? Sp(4) symmetry breaking pattern. I studied the latter via an effective approach but the full theory is able to get rid of some of the pitfalls of the Standard Model.These two models include a scalar sector that is richer than the one found in the Standard Model and contain at least one particle which can be assimilated to the Higgs boson discovered at the LHC.I performed a phenomenological study for these two models and tested them against both theoretical and experimental constraints. In particular I used the latest studies on the 125 GeV Higgs boson and on possible additional scalars performed by the ATLAS and CMS collaborations. The application of all these constraints drastically reduced the available parameter space of the two models. In particular it narrowed the possible mass range of the additional scalars, allowing to know more accurately where to search them experimentally in order to prove or rule out their possible existence.As of today the two theories I worked on are still not excluded by the latest experimentaldata.
Download or read book Phenomenology of the U 1 extended Minimal Supersymmetric Standard Model written by Hye-Sung Lee and published by . This book was released on 2005 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eps High Energy Physics 95 Proceedings Of The International Europhysics Conference written by Catherine Vander Velde and published by World Scientific. This book was released on 1996-05-28 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Symmetry in Special and General Relativity written by Jay Tasson and published by MDPI. This book was released on 2020-01-21 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of special and general relativity has relied significantly on ideas of symmetry. Similarly, modern efforts to test these theories have often sought either violations or extensions of the symmetries seen, and symmetry is regularly used a tool in seeking new applications. In this Special Issue of symmetry, we explore some contemporary research related to symmetry in special and general relativity.
Download or read book Frontiers Of Particle Physics Proceedings Of The Tenth Lomonosov Conference On Elementary Particle Physics written by Alexander I Studenikin and published by World Scientific. This book was released on 2003-02-28 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of proceedings deals with a wide variety of topics — both in theory and in experiment — in particle physics, such as electroweak theory, tests of the Standard Model and beyond, heavy quark physics, nonperturbative QCD, neutrino physics, astroparticle physics, quantum gravity effects, and physics at the future accelerators.
Download or read book Low Energy Probes of Standard Model Extensions written by Brandon Murakami and published by . This book was released on 2002 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of the Standard Model written by John F. Donoghue and published by Cambridge University Press. This book was released on 1994-06-16 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on the techniques by which the model can produce information about real observed phenomena, this book provides a detailed account of the Standard Model of particle physics. Following an account of the theory, the major part of the text is concerned with its application to the calculation of physical properties of particles.
Download or read book Phenomena Beyond the Standard Model What Do We Expect for New Physics to Look Like written by Roman Pasechnik and published by Frontiers Media SA. This book was released on 2020-09-03 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
