Search For Exotic Long Lived Particles Using Disappearing Tracks With The Cms Experiment In Proton Proton Collisions At S
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Search For Exotic Long Lived Particles Using Disappearing Tracks With The Cms Experiment In Proton Proton Collisions At S
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Author : Viktor Gerhard Kutzner
language : en
Publisher:
Release Date : 2023
Search For Exotic Long Lived Particles Using Disappearing Tracks With The Cms Experiment In Proton Proton Collisions At S written by Viktor Gerhard Kutzner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Search For Long Lived Particles Using Delayed Photons In Proton Proton Collisions At 13 Tev With The Cms Detector
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Author : Kevin Patrick McDermott
language : en
Publisher:
Release Date : 2019
Search For Long Lived Particles Using Delayed Photons In Proton Proton Collisions At 13 Tev With The Cms Detector written by Kevin Patrick McDermott 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.
This dissertation presents a search for long-lived particles using delayed photons in proton-proton collisions at sqrt(s) = 13 TeV recorded by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider in 2017, corresponding to an integrated luminosity of 41.5 fb^-1. This analysis includes a number of unique components that will be discussed: a dedicated signal trigger, out-of-time photon reconstruction and identification, and a detector time resolution measurement. The results of this search include the combination of a related analysis using data collected in 2016 also at sqrt(s) = 13 TeV, corresponding to a combined integrated luminosity of 77.4 fb^-1. The combined results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 10^1, 10^2, 10^3, and 10^4 cm, masses up to 320, 525, 360, and 215 GeV are excluded at 95% confidence level, respectively. Additionally, a discussion on a high-performance computing upgrade to CMS, known as mkFit, will be presented. mkFit is an on-going effort to exploit highly parallel computer architectures in vectorizing and parallelizing combinatorial Kalman filter charged particle track reconstruction algorithms. The current physics and computational performance of this project will be discussed.
Search For Disappearing Tracks In Proton Proton Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Disappearing Tracks 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 is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. Disappearing tracks are identified as those with little or no associated calorimeter energy deposits and with missing hits in the outer layers of the tracker. The search uses proton-proton collision data recorded at [arrow]" = 8 TeV that corresponds to an integrated luminosity of 19.5 fb-1. The results of the search are interpreted in the context of the anomaly-mediated supersymmetry breaking (AMSB) model. The number of observed events is in agreement with the background expectation, and limits are set on the cross section of direct electroweak chargino production in terms of the chargino mass and mean proper lifetime. At 95% confidence level, AMSB models with a chargino mass less than 260 GeV, corresponding to a mean proper lifetime of 0.2 ns, are excluded.
Search For Stopped Long Lived Particles Produced In Pp Collisions At 8 Tev At Cms
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Author : Marissa L. Rodenburg
language : en
Publisher:
Release Date : 2014
Search For Stopped Long Lived Particles Produced In Pp Collisions At 8 Tev At Cms written by Marissa L. Rodenburg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
At the Large Hadron Collider counter-rotating proton beams are collided at sqrt(s) = 8 TeV. The Compact Muon Solenoid (CMS) is used to measure the energies and charges of the resulting cascade of particles produced in these collisions. This search focuses on the observation of massive, long-lived particles, such as the gluino, that would suggest new physics beyond the Standard Model. A custom trigger is used to probe time periods during which no proton collisions occur, thereby eliminating most backgrounds to the signal. The remaining backgrounds resulting from cosmic rays, beam-related effects, and instrumental noise, are further reduced using a series of sophisticated selection cuts. Candidate events passing all selection cuts are analyzed using a counting experiment and limits are placed on the cross sections and masses of the gluino and the supersymmetric top quark.
A Search For Exotic Particles Decaying To Wz Pairs In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2012
A Search For Exotic Particles Decaying To Wz Pairs In Pp Collisions At 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 2012 with categories.
A search for exotic particles decaying via WZ to final states with electrons and muons is performed using a data sample of pp collisions collected at 7 TeV center-of-mass energy by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.98 fb-1. A cross section measurement for the production of WZ is also performed on a subset of the collision data. No significant excess is observed over the Standard Model background, so lower bounds at the 95% confidence level are set on the production cross sections of hypothetical particles decaying to WZ in several theoretical scenarios. Assuming the Sequential Standard Model, W' bosons with masses below 1143 GeV/c2 are excluded. New limits are also set for several configurations of Low-Scale Technicolor.
Search For Long Lived Particles Using Delayed Photons In Proton Proton Collisions At S
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2019
Search For Long Lived Particles Using Delayed Photons 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 Heavy Long Lived Multi Charged Particles In Pp Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Heavy Long Lived Multi Charged Particles In Pp 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 heavy long-lived multi-charged particles is performed using the ATLAS detector at the LHC. Data collected in 2012 at [arrow]" = 8 TeV from pp collisions corresponding to an integrated luminosity of 20.3 fb-1 are examined. Particles producing anomalously high ionisation, consistent with long-lived massive particles with electric charges from.
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.
A Search For Long Lived Particles That Decay To Muons Using The Atlas Detector
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Author : Melissa Yexley
language : en
Publisher:
Release Date : 2023
A Search For Long Lived Particles That Decay To Muons Using The Atlas Detector written by Melissa Yexley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a 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.
Results of a search for decays of massive particles to fully hadronic final states are presented. This search uses 20.3 fb-1 of data collected by the ATLAS detector in √s = 8 TeV proton-proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for R-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. The analysis is performed using a requirement on the number of jets, in combination with separate requirements on the number of b-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results are interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass m-g 1TeV for a neutralino mass msubsup-/supX/subsubsup0/sup1/sub = 500 GeV. Direct gluino decays to six quarks are excluded for mgsubsup-/supg