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Higgs Supersymmetry And Dark Matter After Run I Of The Lhc
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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 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 . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two major problems call for an extension of the Standard Model (SM): the hierarchy problem in the Higgs sector and the dark matter in the Universe. The discovery of a Higgs boson with mass of about 125 GeV was clearly the most significant piece of news from CERN's Large Hadron Collider (LHC). In addition to representing the ultimate triumph of the SM, it shed new light on the hierarchy problem and opened up new ways of probing new physics. The various measurements performed at Run I of the LHC constrain the Higgs couplings to SM particles as well as invisible and undetected decays. In this thesis, the impact of the LHC Higgs results on various new physics scenarios is assessed, carefully taking into account uncertainties and correlations between them. Generic modifications of the Higgs coupling strengths, possibly arising from extended Higgs sectors or higher-dimensional operators, are considered. Furthermore, specific new physics models are tested. This includes, in particular, the phenomenological Minimal Supersymmetric Standard Model.While a Higgs boson has been found, no sign of beyond the SM physics was observed at Run I of the LHC in spite of the large number of searches performed by the ATLAS and CMS collaborations. The implications of the negative results obtained in these searches constitute another important part of this thesis. First, supersymmetric models with a dark matter candidate are investigated in light of the negative searches for supersymmetry at the LHC using a so-called "simplified model" approach. Second, tools using simulated events to constrain any new physics scenario from the LHC results are presented. Moreover, during this thesis the selection criteria of several beyond the SM analyses have been reimplemented in the MadAnalysis 5 framework and made available in a public database.
Book Synopsis The Higgs and Supersymmetry at Run II of the LHC. by :
Download or read book The Higgs and Supersymmetry at Run II of the LHC. written by and published by . This book was released on 2016 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prof. David Shih was supported by DOE grant DE-SC0013678 from April 2015 to April 2016. His research during this year focused on the phenomenology of super- symmetry (SUSY) and maximizing its future discovery potential at Run II of the LHC. SUSY is one of the most well-motivated frameworks for physics beyond the Standard Model. It solves the \naturalness" or \hierarchy" problem by stabilizing the Higgs mass against otherwise uncontrolled quantum corrections, predicts \grand uni cation" of the fundamental forces, and provides many potential candidates for dark matter. However, after decades of null results from direct and indirect searches, the viable parameter space for SUSY is increasingly constrained. Also, the discovery of a Standard Model-like Higgs with a mass at 125 GeV places a stringent constraint on SUSY models. In the work supported on this grant, Shih has worked on four di erent projects motivated by these issues. He has built natural SUSY models that explain the Higgs mass and provide viable dark matter; he has studied the parameter space of \gauge mediated supersymmetry breaking" (GMSB) that satis es the Higgs mass constraint; he has developed new tools for the precision calculation of avor and CP observables in general SUSY models; and he has studied new techniques for discovery of supersymmetric partners of the top quark.
Book Synopsis Supersymmetric Dark Matter After LHC Run 1 by :
Download or read book Supersymmetric Dark Matter After LHC Run 1 written by and published by . This book was released on 2015 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Different mechanisms operate in various regions of the MSSM parameter space to bring the relic density of the lightest neutralino, [chi]~01, assumed here to be the lightest SUSY particle (LSP) and thus the dark matter (DM) particle, into the range allowed by astrophysics and cosmology. These mechanisms include coannihilation with some nearly degenerate next-to-lightest supersymmetric particle such as the lighter stau [tau]~1, stop t~1 or chargino [chi]~"1, resonant annihilation via direct-channel heavy Higgs bosons H / A, the light Higgs boson h or the Z boson, and enhanced annihilation via a larger Higgsino component of the LSP in the focus-point region. These mechanisms typically select lower-dimensional subspaces in MSSM scenarios such as the CMSSM, NUHM1, NUHM2, and pMSSM10. We analyze how future LHC and direct DM searches can complement each other in the exploration of the different DM mechanisms within these scenarios. We find that the [tau]~1 coannihilation regions of the CMSSM, NUHM1, NUHM2 can largely be explored at the LHC via searches for /ET events and long-lived charged particles, whereas theirH / A funnel, focus-point and [chi]~"1 coannihilation regions can largely be explored by the LZ and Darwin DM direct detection experiments. Furthermore, we find that the dominant DM mechanism in our pMSSM10 analysis is [chi]~"1 coannihilation: parts of its parameter space can be explored by the LHC, and a larger portion by future direct DM searches.
Book Synopsis Search Strategies for New Physics at the LHC by : Daniele Spier Moreira Alves
Download or read book Search Strategies for New Physics at the LHC written by Daniele Spier Moreira Alves and published by Stanford University. This book was released on 2011 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The LHC is in the frontline of experimental searches for New Physics beyond the Standard Model of Particle Physics. Its power is accompanied by no smaller challenges in analyzing and interpreting its results. In this thesis I explore ways to parameterize new physics phenomena, design search strategies that are sensitive to them, and interpret experimental results in general new physics contexts. In particular, I discuss interpretations of the first ATLAS analysis for supersymmetry with 70/nb of integrated luminosity. I also carry a careful investigation of comprehensive search strategies for new physics with jets and missing energy signatures, and estimate the sensitivity bounds of the 7 TeV LHC to new colored particles decaying to jets and and a neutral particle that escapes detection. Finally, I discuss the implications of the recent LHC excesses hinting to a Higgs boson with mass in the range 142-147 GeV. If confirmed, this range for the Higgs mass will be an important evidence for Split Supersymmetry. I work out the phenomenological predictions of this scenario that will be tested in the very near future by a variety of experiments, including direct and indirect dark matter detection, EDM experiments searching for CP violation and the 7 TeV run of the LHC.
Download or read book Collider written by Paul Halpern and published by Turner Publishing Company. This book was released on 2009-07-17 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: An accessible look at the hottest topic in physics and the experiments that will transform our understanding of the universe The biggest news in science today is the Large Hadron Collider, the world's largest and most powerful particle-smasher, and the anticipation of finally discovering the Higgs boson particle. But what is the Higgs boson and why is it often referred to as the God Particle? Why are the Higgs and the LHC so important? Getting a handle on the science behind the LHC can be difficult for anyone without an advanced degree in particle physics, but you don't need to go back to school to learn about it. In Collider, award-winning physicist Paul Halpern provides you with the tools you need to understand what the LHC is and what it hopes to discover. Comprehensive, accessible guide to the theory, history, and science behind experimental high-energy physics Explains why particle physics could well be on the verge of some of its greatest breakthroughs, changing what we think we know about quarks, string theory, dark matter, dark energy, and the fundamentals of modern physics Tells you why the theoretical Higgs boson is often referred to as the God particle and how its discovery could change our understanding of the universe Clearly explains why fears that the LHC could create a miniature black hole that could swallow up the Earth amount to a tempest in a very tiny teapot "Best of 2009 Sci-Tech Books (Physics)"-Library Journal "Halpern makes the search for mysterious particles pertinent and exciting by explaining clearly what we don't know about the universe, and offering a hopeful outlook for future research."-Publishers Weekly Includes a new author preface, "The Fate of the Large Hadron Collider and the Future of High-Energy Physics" The world will not come to an end any time soon, but we may learn a lot more about it in the blink of an eye. Read Collider and find out what, when, and how.
Book Synopsis Supersymmetry and Beyond by : Gordon Kane
Download or read book Supersymmetry and Beyond written by Gordon Kane and published by Basic Books. This book was released on 2013-05-14 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The epic story of the quest to uncover a fully unified theory of physics, revised to reflect the possible discovery of the Higgs Boson.
Download or read book Dark Matter and Super Symmetry written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Large Hadron Collider (LHC) at CERN in Geneva, Switzerland, is one of the largest machines on this planet. It is built to smash protons into each other at unprecedented energies to reveal the fundamental constituents of our universe. The 4 detectors at the LHC record multi-petabyte datasets every year. The scientific analysis of this data requires equally large simulation datasets of the collisions based on the theory of particle physics, the Standard Model. The goal is to verify the validity of the Standard Model or of theories that extend the Model like the concepts of Supersymmetry and an explanation of Dark Matter. I will give an overview of the nature of simulations needed to discover new particles like the Higgs boson in 2012, and review the different areas where simulations are indispensable: from the actual recording of the collisions to the extraction of scientific results to the conceptual design of improvements to the LHC and its experiments.
Book Synopsis Physics Beyond the Standard Model by :
Download or read book Physics Beyond the Standard Model written by and published by . This book was released on 2008 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model (SM) of particle physics is remarkably successful and has survived two decades of precision tests at high energy particle accelerators. However, it is known to be incomplete, and there are reasons to believe that there is new physics at energy scales that will soon be probed in greater detail than ever before by the Large Hadron Collider (LHC), a proton-proton accelerator being built near Geneva. This thesis contains a diverse set of topics that may broadly be described as physics beyond the SM. In Chapter 2, implications of current experimental constraints are presented for the stop masses and mixing in the Minimal Supersymmetric Standard Model (MSSM), a well-motivated candidate for physics beyond the SM. It is found, for example, that lower bounds on the stop masses are as large as 1 TeV assuming no stop-mixing. Chapter 3 presents the regions in the MSSM with the minimal amount of fine-tuning of electroweak symmetry breaking. The minimal amount of tuning increases enormously for a Higgs mass beyond 120 GeV. Supersymmetry cannot be an exact symmetry, and one possibility is that our Universe is in a long-lived metastable state with broken supersymmetry. In Chapter 4, a generic model with this property is constructed in which all the relevant parameters, including the supersymmetry breaking scale, are generated dynamically. This model has several interesting model-building features including an explicitly and spontaneously broken R-symmetry, a singlet, a large global symmetry, naturalness, renormalizability, and a "pseudo-runaway'' direction. In Chapter 5, a simple extension of the SM with weakly interacting non-chiral dark matter particles is presented. Such particles can be detected at a future direct-detection experiment. There are a wide variety of possible discovery signatures for new physics at the LHC. A discovery signature with a large SM background that has not been well studied involves multi-jet events without leptons and/or missing energy. In Chapter 6, it is found that using innovative search strategies pair production of new coloured adjoint fermions producing a pure six-jet final state can be detected up to a mass of about 650-700 GeV with 10 fb-1 of integrated luminosity.
Book Synopsis Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry by : Marc Christopher Thomas
Download or read book Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry written by Marc Christopher Thomas and published by Springer. This book was released on 2016-08-01 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Testing Supersymmetry at Future High Energy Colliders, in Dark Matter and High Precision Experiments by : Amin Abou Ibrahim
Download or read book Testing Supersymmetry at Future High Energy Colliders, in Dark Matter and High Precision Experiments written by Amin Abou Ibrahim and published by . This book was released on 2020 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The observation of the Higgs boson at 125 GeV indicates that the size of weak scale supersymmetry lies in the TeV region which makes the discovery of supersymmetry at the LHC more challenging. Here we discuss the potential for the discovery of sparticles and of heavier Higgs bosons at HL-LHC and also argue in favor of construction of a machine with higher energy, i.e., a 27 TeV high energy LHC (HE-LHC). We carry out a comparative study for the discovery of electroweakinos and heavier Higgs bosons at the two machines. For a number of test model points, it is found that the discovery of sparticles (or of heavier Higgs) would require a HL-LHC run between 5-8 years while the same parameter points can be discovered in a period of few weeks to ~ 1.5 yr at HE-LHC. The analysis indicates that the HE-LHC possibility should be seriously pursued as it would significantly increase the discovery reach for sparticles and for heavier Higgs beyond the reach of HL-LHC and decrease the run period for discovery for models which are also discoverable at HL-LHC. In this work we also discuss the possibility of detecting hidden sector dark matter at the LHC. Specifically we analyze the case when the dark matter resides in the hidden sector while a charged sparticle is the LSP of MSSM. We show that for the case when the portal to the hidden sector is via gauge kinetic mixing and Stueckelberg mass mixing generating feeble interactions between the visible sector and the hidden sector, the charged LSP of MSSM will decay into the hidden sector dark matter. In this case the charged particle will be long-lived and will leave a track inside the detector. We considered two cases: (i) a stau which produces a track but decays inside the detector and can be identified as a decaying particle with missing energy, (ii) a stop which produces an R-hadron and decays outside. Each case points to a hidden sector dark matter. For the case (ii) future detectors such as MATHUSLA and FASER will explore the lifetime frontier and are capable of detecting long-lived particles such as the stop which decay further away from their production vertex and they will provide further test of the hidden sector dark matter models. We show that models where the dark matter resides in the hidden sector require both the freeze-out and the freeze-in mechanisms to produce the desired amount of dark matter consistent with the Planck experiment. We also show that the existence of a hidden sector can expand the parameter space of natural supersymmetry. Finally we discuss how precision physics provides another avenue for the exploration of new physics beyond the standard model"--Author's abstract.
Book Synopsis Searches for the Supersymmetric Partner of the Top Quark, Dark Matter and Dark Energy at the ATLAS Experiment by : Nicolas Maximilian Köhler
Download or read book Searches for the Supersymmetric Partner of the Top Quark, Dark Matter and Dark Energy at the ATLAS Experiment written by Nicolas Maximilian Köhler and published by Springer. This book was released on 2020-09-24 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astrophysical observations implying the existence of Dark Matter and Dark Energy, which are not described by the Standard Model (SM) of particle physics, have led to extensions of the SM predicting new particles that could be directly produced at the Large Hadron Collider (LHC) at CERN. Based on 2015 and 2016 ATLAS proton-proton collision data, this thesis presents searches for the supersymmetric partner of the top quark, for Dark Matter, and for DarkEnergy, in signatures with jets and missing transverse energy. Muon detection is key to some of the most important LHC physics results, including the discovery of the Higgs boson and the measurement of its properties. The efficiency with which muons can be detected with the ATLAS detector is measured using Z boson decays. The performance of high-precision Monitored Drift Tube muon chambers under background rates similar to the ones expected for the High Luminosity-LHC is studied.
Book Synopsis The Quantum Frontier by : Don Lincoln
Download or read book The Quantum Frontier written by Don Lincoln and published by JHU Press. This book was released on 2009-03-10 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The highest-energy particle accelerator ever built, the Large Hadron Collider runs under the border between France and Switzerland. It leapt into action on September 10, 2008, amid unprecedented global press coverage and widespread fears that its energy would create tiny black holes that could destroy the earth. By smashing together particles smaller than atoms, the LHC recreates the conditions hypothesized to have existed just moments after the big bang. Physicists expect it to aid our understanding of how the universe came into being and to show us much about the standard model of particle physics—even possibly proving the existence of the mysterious Higgs boson. In exploring what the collider does and what it might find, Don Lincoln explains what the LHC is likely to teach us about particle physics, including uncovering the nature of dark matter, finding micro black holes and supersymmetric particles, identifying extra dimensions, and revealing the origin of mass in the universe. Thousands of physicists from around the globe will have access to the LHC, none of whom really knows what outcomes will be produced by the $7.7 billion project. Whatever it reveals, the results arising from the Large Hadron Collider will profoundly alter our understanding of the cosmos and the atom and stimulate amateur and professional scientists for years to come.
Book Synopsis Implications for Dark Matter from Supersymmetric Axion Cosmology by : Raymond Tung Ming Co
Download or read book Implications for Dark Matter from Supersymmetric Axion Cosmology written by Raymond Tung Ming Co and published by . This book was released on 2017 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the Higgs boson discovery at the Large Hadron Collider, the Standard Model continues to prove its success in particle physics and cosmology. Despite its remarkable achievements, the Standard Model remains incomplete owing to theoretical difficulties such as the hierarchy problem, the strong charge-parity (CP) problem, and the lack of dark matter candidates. Supersymmetry has been proposed to solve the hierarchy problem by protecting the Higgs mass from radiative quantum corrections. In supersymmetry, the lightest supersymmetric particles are well-motivated candidates for dark matter. When the Peccei-Quinn symmetry is evoked to solve the strong CP problem, the axion becomes another viable candidate. One can attempt to simultaneously solve the aforementioned problems with supersymmetric axion theories. Nonetheless, the scalar superpartner of the axion, the saxion, significantly changes the conventional picture of cosmology and dark matter production. During inflation, a potential for saxions is induced and displaces the saxion field value away from the minimum of the potential today. This results in a saxion condensate that dominates the energy density of the Universe -- a non-standard matter-dominated epoch. The saxion subsequently decays to the particles in the thermal bath, generating a large amount of entropy and diluting the dark matter abundance. The saxion hence plays a crucial role in the cosmological evolution of dark matter. We focus on the cases where dark matter is the axion from the misalignment mechanism, or the axino/gravitino lightest supersymmetric particle that is populated from the thermal scattering and freeze-in processes. The former case allows the Peccei-Quinn symmetry and grand unification to be of the same origin, whereas the latter case allows a high reheat temperature after inflation, solving the axino/gravitino problems. We will also discuss interesting phenomenology for this class of theories such as dark radiation and displaced vertices at colliders.
Book Synopsis Most Unexpected At Lhc And The Status Of High Energy Frontier, The - Proceedings Of The International School Of Subnuclear Physics by : Antonino Zichichi
Download or read book Most Unexpected At Lhc And The Status Of High Energy Frontier, The - Proceedings Of The International School Of Subnuclear Physics written by Antonino Zichichi and published by World Scientific. This book was released on 2011-12-28 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:Hot Theoretical Topics:Ultraviolet Behavior of N = 8 Supergravity (L J Dixon)Is the Best Superstring Model NP Complete? (M R Douglas)Erice Lecture on Microscopic Gravity (G Dvali) Supergravity: Foundations and Applications (S Ferrara)Orienfold String Vacua and Strings at the LHC (D Luest)Seminars on Specialized Topics:Status of Dark Matter and Neutrino Physics (A Bettini)Experimental Evidence for Pointlike Baryons at q2 = 4MB2 (S Pacetti) Neutrino Masses, Dark Matter, Baryon Asymmetry and Inflation can be Explained at Once (M Shaposhnikov)Results from RHIC with Implications for LHC (M J Tannenbaum)Quantum Gravity without Space-Time Singularities or Horizons (G 't Hooft)Diffraction in Deep Inelastic Electron Proton Scattering at HERA (G Wolf)The Lesson Needed for the Future (A Zichichi)Highlights from Laboratories:Highlights from Relativistic Heavy Ion Collider (P R Sorensen)The LHC and Beyond — The Energy Frontier (R D Heuer)Highlights from the Gran Sasso Underground Laboratory (E Coccia)Highlights from Fermilab (S J Parke)Special Sessions for New Talents:Radiation Damage Studies for Silicon Sensors for the XFEL (H Perrey)Notes on Chern–Simons Theory in the Temporal Gauge (A Smirnov)Dark Matter via Many Copies of the Standard Model (A Vikman) Readership: Students, researchers and academics in the field of subnuclear physics. Keywords:Black Holes;QCD;SUSY;QED;Collider;Attractors
Book Synopsis Weak Scale Supersymmetry by : Howard Baer
Download or read book Weak Scale Supersymmetry written by Howard Baer and published by Cambridge University Press. This book was released on 2023-01-31 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: This OA text develops the basic concepts of supersymmetry for experimental and phenomenological particle physicists and graduate students.
Book Synopsis Supersymmetry and Dark Matter, a New Candidate by : David Thomas
Download or read book Supersymmetry and Dark Matter, a New Candidate written by David Thomas and published by . This book was released on 1991 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
