Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector

A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb -1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degen...

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Publicado: 2013
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v88_n11_p112006-1_Aad
http://hdl.handle.net/20.500.12110/paper_15507998_v88_n11_p112006-1_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15507998_v88_n11_p112006-1_Aad
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spelling paper:paper_15507998_v88_n11_p112006-1_Aad2023-06-08T16:22:39Z Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb -1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level. © 2013 CERN, for the ATLAS Collaboration. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v88_n11_p112006-1_Aad http://hdl.handle.net/20.500.12110/paper_15507998_v88_n11_p112006-1_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb -1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level. © 2013 CERN, for the ATLAS Collaboration.
title Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector
spellingShingle Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector
title_short Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector
title_full Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector
title_fullStr Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector
title_full_unstemmed Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 TeV with the ATLAS detector
title_sort search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s) = 8 tev with the atlas detector
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v88_n11_p112006-1_Aad
http://hdl.handle.net/20.500.12110/paper_15507998_v88_n11_p112006-1_Aad
_version_ 1768544336697360384

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