Search For Massive Long Lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs In Math Display
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Search For Massive Long Lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs In Math Display
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Author :
language : en
Publisher:
Release Date : 2015
Search For Massive Long Lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs In Math Display written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Many extensions of the Standard Model posit the existence of heavy particles with long lifetimes. This article presents the results of a search for events containing at least one long-lived particle that decays at a significant distance from its production point into two leptons or into five or more charged particles. In this study, this analysis uses a data sample of proton-proton collisions at \(\sqrt{s} = 8\) TeV corresponding to an integrated luminosity of 20.3 fb−1 collected in 2012 by the ATLAS detector operating at the Large Hadron Collider. No events are observed in any of the signal regions, and limits are set on model parameters within supersymmetric scenarios involving R-parity violation, split supersymmetry, and gauge mediation. In some of the search channels, the trigger and search strategy are based only on the decay products of individual long-lived particles, irrespective of the rest of the event. In these cases, the provided limits can easily be reinterpreted in different scenarios.
Search For Massive Long Lived Particles In Final States With A Multi Track Displaced Vertex And An Electron In Pp Collisions At S
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Author : Nimrod Taiblum
language : en
Publisher:
Release Date : 2017
Search For Massive Long Lived Particles In Final States With A Multi Track Displaced Vertex And An Electron In Pp Collisions At S written by Nimrod Taiblum and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Displaced Vertices
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Author : Dan Quach
language : en
Publisher:
Release Date : 2020
Displaced Vertices written by Dan Quach and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
We report the results of a search for long-lived particles produced in pairs in proton-proton collisions at the LHC operating at a center-of-mass energy of √s = 13 TeV. The data were collected by the CMS detector during the full Run 2 data taking period from 2015 through 2018, corresponding to a total integrated luminosity of 140/fb. This search targets pair-produced long-lived particles with a mean proper decay length between 0.1 and 100 mm that each decay into at least two quarks. The signature is a pair of displaced vertices each formed from many tracks. This search extends a previous CMS search using the 2015 and 2016 dataset, with improvements in background rejection, background estimation techniques, as well as uncertainty estimation. Results are compared with R-parity violating supersymmetry models that predict pair-produced long-lived particles, each decaying into multijet or dijet final states. No events are observed with two reconstructed high-track-multiplicity vertices. For models of long-lived pair-produced neutralinos, gluinos, and top squarks, pair-production cross sections larger than 0.08 fb at 95% confidence level are excluded for masses between 800 and 3000 GeV and mean proper decay lengths between 1 and 25 mm. In the gluino model, masses up to 2500 GeV are excluded for mean proper decay lengths between 0.6 and 90 mm. In the neutralino model, masses up to 1100 GeV are excluded for mean proper decay lengths between 0.6 and 70 mm. For the top squark model, masses up to 1600 GeV are excluded for mean proper decay lengths between 0.4 and 80 mm.
Search For Long Lived Neutral Particles In Final States With A Muon And Multi Track Displaced Vertex With The Atlas Detector At The Large Hadron Collider
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Author : Chang Wei Loh
language : en
Publisher:
Release Date : 2013
Search For Long Lived Neutral Particles In Final States With A Muon And Multi Track Displaced Vertex With The Atlas Detector At The Large Hadron Collider written by Chang Wei Loh 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.
Search For Long Lived Supersymmetric Particles Using Displaced Vertices With The Atlas Detector At The Lhc
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Author : Emily Anne Thompson
language : en
Publisher:
Release Date : 2022
Search For Long Lived Supersymmetric Particles Using Displaced Vertices With The Atlas Detector At The Lhc written by Emily Anne Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Search For Long Lived Particles That Decay Into Final States Containing Two Electrons Or Two Muons In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Long Lived Particles That Decay Into Final States Containing Two Electrons Or Two Muons 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 2015 with categories.
A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6 (20.5) fb-1 in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at √s=8 TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle's mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125-1000 GeV/c2 decays into a pair of long-lived neutral bosons in the mass range 20-350 GeV/c2, each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2-10 fb for mean proper decay lengths of the long-lived particles in the range 0.01-100 cm. In the case of the lowest Higgs mass considered (125 GeV/c2), the limits are in the range 2-50 fb. As a result, these limits are sensitive to Higgs boson branching fractions as low as 10-4.
Search For Long Lived Particles Decaying To Oppositely Charged Lepton Pairs With The Atlas Experiment At S
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Author : Dominik Krauss
language : en
Publisher:
Release Date : 2019
Search For Long Lived Particles Decaying To Oppositely Charged Lepton Pairs With The Atlas Experiment At S written by Dominik Krauss 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 Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At Arrow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb-1 of proton-proton collision data at [arrow]" = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date.
Search For Charged Massive Long Lived Particles Using The D0 Detector
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Author :
language : en
Publisher:
Release Date : 2009
Search For Charged Massive Long Lived Particles Using The D0 Detector 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.
A search for charged massive stable particles has been performed with the D0 detector using 1.1 fb−1 of data. The speed of the particle has been calculated based on the time-of-flight and position information in the muon system. The present research is limited to direct pair-production of the charged massive long-lived particles. We do not consider CMSPs that result from the cascade decays of heavier particles. In this analysis, the exact values of the model parameters of the entire supersymmetric particle mass spectrum, relevant for cascade decays, are not important. We found no evidence of the signal. 95% CL cross-section upper limits have been set on the pair-productions of the stable scaler tau lepton, the gaugino-like charginos, and the higgsino-like charginos. The upper cross section limits vary from 0.31 pb to 0.04 pb, for stau masses in the range between 60 GeV and 300 GeV. We use the nominal value of the theoretical cross section to set limits on the mass of the pair produced charginos. We exclude the pair-produced stable gaugino-like charginos with mass below 206 GeV, and higgsino-like charginos below 171 GeV, respectively. Although the present sensitivity is insufficient to test the model of the pair produced stable staus, we do set cross section limits which can be applied to the pair production of any charged massive stable particle candidates with similar kinematics. These are the most restrictive limits to the present on the cross sections for CMSPs and the first published from the Tevatron Collider Run II. The manuscript has been published by Physical Review Letters in April 2009 and is available at arXiv as.
Search For Neutral Long Lived Particles In Pp Collisions At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For Neutral Long Lived Particles In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: A search for decays of pair-produced neutral long-lived particles (LLPs) is presented using 139 fb−1 of proton-proton collision data collected by the ATLAS detector at the LHC in 2015-2018 at a centre-of-mass energy of 13 TeV. Dedicated techniques were developed for the reconstruction of displaced jets produced by LLPs decaying hadronically in the ATLAS hadronic calorimeter. Two search regions are defined for different LLP kinematic regimes. The observed numbers of events are consistent with the expected background, and limits for several benchmark signals are determined. For a SM Higgs boson with a mass of 125 GeV, branching ratios above 10% are excluded at 95% confidence level for values of c times LLP mean proper lifetime in the range between 20 mm and 10 m depending on the model. Upper limits are also set on the cross-section times branching ratio for scalars with a mass of 60 GeV and for masses between 200 GeV and 1 TeV