Searches For Physics Beyond The Standard Model With The Mt2 Variable In Hadronic Final States With And Without Disappearing Tracks In Proton Proton Collisions At S
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Searches For Physics Beyond The Standard Model With The Mt2 Variable In Hadronic Final States With And Without Disappearing Tracks In Proton Proton Collisions At S
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2019
Searches For Physics Beyond The Standard Model With The Mt2 Variable In Hadronic Final States With And Without Disappearing Tracks In Proton Proton Collisions At S written by Albert M. Sirunyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Search For New Physics With The Mt2 Variable In All Jets Final States Produced In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Physics With The Mt2 Variable In All Jets Final States Produced In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A search for new physics is performed using events that contain one or more jets, no isolated leptons, and a large transverse momentum imbalance, as measured through the MT2 variable, which is an extension of the transverse mass in events with two invisible particles. The results are based on a sample of proton-proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and that corresponds to an integrated luminosity of 2.3 inverse femtobarns. The observed event yields in the data are consistent with predictions for the standard model backgrounds. The results are interpreted using simplified models of supersymmetry and are expressed in terms of limits on the masses of potential new colored particles. Assuming that the lightest neutralino is stable and has a mass less than about 500 GeV, gluino masses up to 1550-1750 GeV are excluded at 95% confidence level, depending on the gluino decay mechanism. For the scenario of direct production of squark-antisquark pairs, top squarks with masses up to 800 GeV are excluded, assuming a 100% branching fraction for the decay to a top quark and neutralino. Similarly, bottom squark masses are excluded up to 880 GeV, and masses of light-flavor squarks are excluded up to 600-1260 GeV, depending on the degree of degeneracy of the squark masses.
Search For New Physics In Fully Hadronic Nal States Using The Mt2 Variable At A Center Of Mass Energy Of 13 Tev With The Cms Detector
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Author : Jason Gran
language : en
Publisher:
Release Date : 2016
Search For New Physics In Fully Hadronic Nal States Using The Mt2 Variable At A Center Of Mass Energy Of 13 Tev With The Cms Detector written by Jason Gran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
An inclusive search for new physics in events with fully hadronic final states using the MT2 variable is presented. The results are based on a sample of 13 TeV center-of-mass energy proton-proton collisions, corresponding to 2.3 fb-1 of integrated luminosity collected with the CMS detector at the LHC in 2015. No excess event yield above the Standard Model background expectation is observed. The results are interpreted as limits on simplified models of supersymmetry, expressed as limits on the masses of potential new colored particles. Assuming a stable LSP with mass less than 500 GeV, gluino masses up to 1550-1750 are excluded at 95% confidence level, depending on the gluino decay mechanism. For models of direct squark pair production, top squarks with masses up to 800 GeV are excluded. Bottom squarks with masses up to 880 GeV are excluded. Light flavor squarks with masses up to 600-1260 GeV, depending on the degeneracy of squark masses, are excluded.
The Search For Physics Beyond The Standard Model In The B Bar B Spectrum Observed In Tevatron P Bar P Collisions
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Author :
language : en
Publisher:
Release Date : 1998
The Search For Physics Beyond The Standard Model In The B Bar B Spectrum Observed In Tevatron P Bar P Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Many extensions have been proposed to the Standard Model of fundamental particles and interactions, therefore we have conducted a general search with the Collider Detector at Fermilab (CDF) for particles which would be expected to appear as a resonance in the b$\bar{b}$ mass spectrum produced in proton-antiproton collisions at a center-of-mass energy of √s = 1.8 TeV at the Fermilab Tevatron collider.
Search For Beyond Standard Model Physics Non Susy In Final States With Photons At The Tevatron
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Author :
language : en
Publisher:
Release Date : 2009
Search For Beyond Standard Model Physics Non Susy In Final States With Photons At The Tevatron written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
We present the results of searches for non-standard model phenomena in photon final states. These searches use data from integrated luminosities of (almost equal to) 1-4 fb−1 of p{bar p} collisions at (square root)s = 1.96 TeV, collected with the CDF and D0 detectors at the Fermilab Tevatron. No significant excess in data has been observed. We report limits on the parameters of several BSM models (excluding SUSY) for events containing photons.
The Beyond The Standard Model Working Group
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Author :
language : en
Publisher:
Release Date : 2004
The Beyond The Standard Model Working Group written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
In this working group we have investigated a number of aspects of searches for new physics beyond the Standard Model (SM) at the running or planned TeV-scale colliders. For the most part, we have considered hadron colliders, as they will define particle physics at the energy frontier for the next ten years at least. The variety of models for Beyond the Standard Model (BSM) physics has grown immensely. It is clear that only future experiments can provide the needed direction to clarify the correct theory. Thus, our focus has been on exploring the extent to which hadron colliders can discover and study BSM physics in various models. We have placed special emphasis on scenarios in which the new signal might be difficult to find or of a very unexpected nature. For example, in the context of supersymmetry (SUSY), we have considered: how to make fully precise predictions for the Higgs bosons as well as the superparticles of the Minimal Supersymmetric Standard Model (MSSM) (parts III and IV); MSSM scenarios in which most or all SUSY particles have rather large masses (parts V and VI); the ability to sort out the many parameters of the MSSM using a variety of signals and study channels (part VII); whether the no-lose theorem for MSSM Higgs discovery can be extended to the next-to-minimal Supersymmetric Standard Model (NMSSM) in which an additional singlet superfield is added to the minimal collection of superfields, potentially providing a natural explanation of the electroweak value of the parameter [mu] (part VIII); sorting out the effects of CP violation using Higgs plus squark associate production (part IX); the impact of lepton flavor violation of various kinds (part X); experimental possibilities for the gravitino and its sgoldstino partner (part XI); what the implications for SUSY would be if the NuTeV signal for di-muon events were interpreted as a sign of R-parity violation (part XII). Our other main focus was on the phenomenological implications of extra dimensions. There, we considered: constraints on Kaluza Klein (KK) excitations of the SM gauge bosons from existing data (part XIII) and the corresponding projected LHC reach (part XIV); techniques for discovering and studying the radion field which is generic in most extra-dimensional scenarios (part XV); the impact of mixing between the radion and the Higgs sector, a fully generic possibility in extra-dimensional models (part XVI); production rates and signatures of universal extra dimensions at hadron colliders (part XVII); black hole production at hadron colliders, which would lead to truly spectacular events (part XVIII). The above contributions represent a tremendous amount of work on the part of the individuals involved and represent the state of the art for many of the currently most important phenomenological research avenues. Of course, much more remains to be done. For example, one should continue to work on assessing the extent to which the discovery reach will be extended if one goes beyond the LHC to the super-high-luminosity LHC (SLHC) or to a very large hadron collider (VLHC) with √s ≈ 40 TeV. Overall, we believe our work shows that the LHC and future hadronic colliders will play a pivotal role in the discovery and study of any kind of new physics beyond the Standard Model. They provide tremendous potential for incredibly exciting new discoveries.
Search For Universal Extra Dimensions In The Two Photon And Missing Transverse Energy Final State With The Atlas Detector
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Author : Baharak Fatholahzadeh
language : en
Publisher:
Release Date : 2012
Search For Universal Extra Dimensions In The Two Photon And Missing Transverse Energy Final State With The Atlas Detector written by Baharak Fatholahzadeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Search For New Phenomena In Ttbar Events With Large Missing Transverse Momentum In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For New Phenomena In Ttbar Events With Large Missing Transverse Momentum In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Susy Multilepton Signatures At Tevatron
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Author :
language : en
Publisher:
Release Date : 2007
Susy Multilepton Signatures At Tevatron written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
One of the most striking signature of supersymmetric models with electroweak symmetry breaking is the presence of multilepton event topologies in the decay products. In this paper searches are presented for physics beyond the Standard Model (SM) in final states containing charged leptons from proton-antiproton collision data at a center-of-mass energy of 1.96 TeV, collected with Run II CDF and D0 Detectors in 2002-2006, and corresponding to integrated luminosities of up to 1.1 fb−1. In any of the searches no excess of candidates was observed with respect to the SM predictions and limits on masses and production cross-sections are set at the 95% CL.
Searches In Dilepton Final States At Cdf
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Author :
language : en
Publisher:
Release Date : 2010
Searches In Dilepton Final States At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Event signatures with two oppositely or same-sign charged leptons are predicted in many new physics scenarios. Such events could arise from chargino-neutralino production, in decays of pair produced supersymmetric top quarks, additional massive vector bosons or exotic heavy quarks. We present the most recent results from the CDF experiment on searches for physics beyond the Standard Model in events with two leptons in the final state produced in p{bar p} collisions at (square root)s = 1.96 TeV at Fermilab Tevatron.