Download or read book Searches for Gauge mediated Supersymmetry Breaking at ALEPH with Centre of mass Energies Up to 209 GeV written by Aran Garcia-Bellido and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Displaced Leptons in the ATLAS Detector written by Lesya Horyn and published by Springer Nature. This book was released on 2022-02-07 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).
Download or read book Search for Supersymmetry in pp Collisions at s 8 TeV with a Photon Lepton and Missing Transverse Energy written by Yutaro Iiyama and published by Springer. This book was released on 2017-06-14 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.
Download or read book The 10th International Conference on Supersymmetry and Unification of Fundamental Interactions written by Pran Nath and published by . This book was released on 2002 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perspectives on Supersymmetry II written by G. L. Kane and published by World Scientific. This book was released on 2010 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supersymmetry is at an exciting stage of development. It extends the Standard Model of particle physics into a more powerful theory that both explains more and allows more questions to be addressed. Most importantly, it opens a window for studying and testing fundamental theories at the Planck scale. Experimentally we are finally entering the intensity and energy and sensitivity regions where superpartners and supersymmetric dark matter candidates are likely to be detected, and then studied. There has been progress in understanding the remarkable physics implications of supersymmetry, including the derivation of the Higgs mechanism, the unification of the Standard Model forces, cosmological connections such as a candidate for the cold dark matter of the universe and consequences for understanding the cosmological history of the universe, and more. This volume begins with an excellent pedagogical introduction to the physics and methods and formalism of supersymmetry which is accessible to anyone with a basic knowledge of the Standard Model of particle physics.Next is an overview of open questions, followed by chapters on topics such as how to detect superpartners and tools for studying them, the current limits on superpartner masses as we enter the LHC era, the lightest superpartner as a dark matter candidate in thermal and non-thermal cosmological histories, and associated Z'' physics. Most chapters have been extended and updated from the earlier edition and some are new. This superb book will allow interested physicists to understand the coming experimental and theoretical progress in supersymmetry and the implications of discoveries of superpartners, and will also help students and workers to quickly learn new aspects of supersymmetry they want to pursue.
Download or read book HEP MAD 01 written by S. Narison and published by World Scientific. This book was released on 2002 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents material that includes introductory reviews of astrophysics, the status of electroweak theories, Higgs searches, and precision tests of the standard model. Recent results on CP violation from CERN's NA48 experiment are discussed, along with the most recent results from the Babar and Belle experiments at the B factories at SLAC in the US and KEK in Japan. Following that are theoretical talks on heavy quark decays and non-perturbative QCD. There are also discussions on QCD results from CERN's LEP and DESY's HERA colliders. Pre-conference presentations cover applications of the field in the environmental and medical domains.
Download or read book Hep mad 01 Proceedings Of The First Madagascar International Conference On High energy Physics written by Stephan Narison and published by World Scientific. This book was released on 2002-07-23 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents material that includes introductory reviews of astrophysics, the status of electroweak theories, Higgs searches, and precision tests of the standard model. Recent results on CP violation from CERN's NA48 experiment are discussed, along with the most recent results from the Babar and Belle experiments at the B factories at SLAC in the US and KEK in Japan. Following that are theoretical talks on heavy quark decays and non-perturbative QCD. There are also discussions on QCD results from CERN's LEP and DESY's HERA colliders. Pre-conference presentations cover applications of the field in the environmental and medical domains.
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 Frontiers of Particle Physics written by A. I. Studenikin and published by World Scientific. This book was released on 2003 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of proceedings deals with a wide variety of topics OCo both in theory and in experiment OCo 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 Implications of Gauge mediated Supersymmetry Breaking with Vector like Quarks and a 1 25 GeV Higgs Boson written by and published by . This book was released on 2012 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: We investigate the implications of models that achieve a Standard Model-like Higgs boson of mass near 125 GeV by introducing additional TeV-scale supermultiplets in the vector-like 10+\bar representation of SU(5), within the context of gauge-mediated supersymmetry breaking. We study the resulting mass spectrum of superpartners, comparing and contrasting to the usual gauge-mediated and CMSSM scenarios, and discuss implications for LHC supersymmetry searches. This approach implies that exotic vector-like fermions t'_{1,2}, b', and \tau' should be within the reach of the LHC. We discuss the masses, the couplings to electroweak bosons, and the decay branching ratios of the exotic fermions, with and without various unification assumptions for the mass and mixing parameters. We comment on LHC prospects for discovery of the exotic fermion states, both for decays that are prompt and non-prompt on detector-crossing time scales.
Download or read book Search for Supersymmetry in Electroweak Production with Photons and Large Missing Transverse Energy in Pp Collisions at sqrt s written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are reported from a search for supersymmetry with gauge-mediated supersymmetry breaking in electroweak production. Final states with photons and large missing transverse energy ($E_{\mathrm{T}}^{\text{miss}}$) were examined. The data sample was collected in pp collisions at $\sqrt{s} = $ 8 TeV with the CMS detector at the LHC and corresponds to 7.4 fb$^{-1}$. The analysis focuses on scenarios in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape undetected. The data were obtained using a specially designed trigger with dedicated low thresholds, providing good sensitivity to signatures with photons, $E_{\mathrm{T}}^{\text{miss}}$, and low hadronic energy. No excess of events over the standard model expectation is observed. The results are interpreted using the model of general gauge mediation. With the wino mass fixed at 10 GeV above that of the bino, wino masses below 710 GeV are excluded at 95% confidence level. Constraints are also set in the context of two simplified models, for which the analysis sets the lowest cross section limits on the electroweak production of supersymmetric particles.
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2004 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Stable and Long lived Heavy Charged Particles in Electron positron Collisions at Center of Mass Energies from 130 to 209 GeV with the OPAL Detector at LEP written by Gabriele Benelli and published by . This book was released on 2003 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Supersymmetry in Hadronic Final States with Missing Transverse Energy Using the Variables alpha T and B quark Multiplicity in Pp Collisions at sqrt s written by and published by . This book was released on 2013 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb-1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, [alpha] T, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. Finally, for the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks.
Download or read book Search for Gauge mediated Supersymmetry Breaking written by Allison Reinsvold Hall and published by . This book was released on 2018 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Searches for Gauge Mediated Supersymmetry at the Tevatron written by and published by . This book was released on 2010 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of searches for new physics in events with two photons and large missing transverse energy collected with both detectors at the Fermilab Tevatron collider. Several models of physics beyond the Standard Model motivate searches in this final state, in particular supersymmetry (SUSY) with gauge-mediated supersymmetry breaking. The D0 collaboration interprets also its search in the framework of universal extra dimensions (UED) with gravity-mediated Kaluza-Klein excitation decays. The results presented use 2.6 fb−1 (CDF) and 6.3 fb−1 (D0) of data collected at the Fermilab Tevatron collider.
Download or read book Search for Supersymmetry with Gauge Mediated Breaking in Diphoton Events with Missing Transverse Energy at CDF II written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present the results of a search for supersymmetry with gauge-mediated breaking and {tilde {chi}}1° → [gamma]{tilde G} in the [gamma][gamma] + missing transverse energy final state. In 2.6 ± 0.2 fb−1 of p{bar p} collisions at √s = 1.96 TeV recorded by the CDF II detector they observe no candidate events, consistent with a standard model background expectation of 1.4 ± 0.4 events. They set limits on the cross section at the 95% C.L. and place the world's best limit of 149 GeV/c2 on the {tilde {chi}}1° mass at [tau]{sub {tilde {chi}}1°} “ 1 ns. They also exclude regions in the {tilde {chi}}1° mass-lifetime plane of [tau]{sub {tilde {chi}}1°} ≈
