A Search For Disappearing Tracks In Proton Proton Collisions At Sqrt S
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A Search For Disappearing Tracks In Proton Proton Collisions At Sqrt S
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Author : Jessica Danielle Brinson
language : en
Publisher:
Release Date : 2015
A Search For Disappearing Tracks In Proton Proton Collisions At Sqrt S written by Jessica Danielle Brinson 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.
This thesis presents a search for evidence of new supersymmetric particles in proton-proton collision data collected by the Compact Muon Solenoid at the Large Hadron Collider located in Geneva, Switzerland. The data was collected in 2012 at a center of mass energy of 8 TeV and corresponds to an integrated luminosity of 19.5 inverse femtobarns. The search examines events that produce the experimental signature of a disappearing track. Disappearing tracks are identifed as those with little or no associated calorimeter energy deposits and with several missing hits in the outer layers of the tracker. This search is motived by anomaly-mediated supersymmetry which postulates that a long-lived chargino decaying to a neutralino and pion with low momentum could give rise to a disappearing track. The sources of background in this search arise from leptons which fail to be reconstructed and false trajectories determined by the track reconstruction algorithm. 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, anomaly-mediated supersymmetry breaking models with a chargino mass less than 260 GeV, corresponding to a mean proper lifetime of 0.2 ns, are excluded.
Search For Dark Matter With Atlas
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Author : Ruth Pöttgen
language : en
Publisher: Springer
Release Date : 2016-06-29
Search For Dark Matter With Atlas written by Ruth Pöttgen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-29 with Science categories.
This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1. Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.
Heavy Neutral Particle Decays To Tau Pairs
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Author : Michail Bachtis
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-12-13
Heavy Neutral Particle Decays To Tau Pairs written by Michail Bachtis and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-13 with Science categories.
The work presented in this thesis spans a wide range of experimental particle physics subjects, starting from level-1 trigger electronics to the final results of the search for Higgs boson decay and to tau lepton pairs. The thesis describes an innovative reconstruction algorithm for tau decays and details how it was instrumental in providing a measurement of Z decay to tau lepton pairs. The reliability of the analysis is fully established by this measurement before the Higgs boson decay to tau lepton pairs is considered. The work described here continues to serve as a model for analysing CMS Higgs to tau leptons measurements.
Search For Disappearing Tracks In Proton Proton Collisions At S
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2020
Search For 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 2020 with categories.
Search For New Physics In Mono Jet Final States In Pp Collisions
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Author : Giuliano Gustavino
language : en
Publisher: Springer
Release Date : 2017-06-19
Search For New Physics In Mono Jet Final States In Pp Collisions written by Giuliano Gustavino and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-19 with Science categories.
This thesis provides a detailed and comprehensive description of the search for New Physics at the Large Hadron Collider (LHC) in the mono-jet final state, using the first 3.2 fb-1 of data collected at the centre of mass energy of colliding protons of 13~TeV recorded in the ATLAS experiment at LHC. The results are interpreted as limits in different theoretical contexts such as compressed supersymmetric models, theories that foresee extra-spatial dimensions and in the dark matter scenario. In the latter the limits are then compared with those obtained by other ATLAS analyses and by experiments based on completely different experimental techniques, highlighting the role of the mono-jet results in the context of dark matter searches.Lastly, a set of possible analysis improvements are proposed to reduce the main uncertainties that affect the signal region and to increase the discovery potential by further exploiting the information on the final state.
Search For Disappearing Tracks In Proton Proton Collisions At S
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Author : Andrew E. Hart
language : en
Publisher:
Release Date : 2018
Search For Disappearing Tracks In Proton Proton Collisions At S written by Andrew E. Hart and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Particles (Nuclear physics) categories.
A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. A disappearing track is an isolated track with no associated hits in the muon detectors, small associated calorimeter energy deposits, and missing hits in the outer layers of the silicon tracker. The search uses 38.4 fb-1 of proton-proton collision data collected by the CMS detector in 2015 and 2016, at a center-of-mass energy of 13 TeV at the CERN LHC. The results of the search are interpreted in the context of anomaly-mediated supersymmetry breaking. The observation is consistent with the background-only hypothesis, and limits are set on the product of the cross section of direct chargino production and the branching fraction to a neutralino and a pion in terms of the chargino mass and lifetime. At 95% confidence level, charginos with masses less than 715 GeV are excluded for a lifetime of 3 ns.
Dimuon Production In Proton Antiproton Collisions At Square Root Of S
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Author : Gerry Bauer
language : en
Publisher:
Release Date : 1986
Dimuon Production In Proton Antiproton Collisions At Square Root Of S written by Gerry Bauer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Fragmentation Properties Of Jets Produced In Pp Collisions At Square Root Sign S
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Author : Bradley Hubbard
language : en
Publisher:
Release Date : 1989
Fragmentation Properties Of Jets Produced In Pp Collisions At Square Root Sign S written by Bradley Hubbard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
A Measurement Of The Production Cross Section Of Tt Pairs In Proton Antiproton Collisions At Square Root S
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Author : Henri Bachacou
language : en
Publisher:
Release Date : 2004
A Measurement Of The Production Cross Section Of Tt Pairs In Proton Antiproton Collisions At Square Root S written by Henri Bachacou 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.
Direct B Quark Anti B Quark Production In Proton Anti Proton Collisions At Square Root Of S
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Author : Jodi Lamoureux
language : en
Publisher:
Release Date : 1993
Direct B Quark Anti B Quark Production In Proton Anti Proton Collisions At Square Root Of S written by Jodi Lamoureux and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.