Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector

An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22:9 fb -1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are tr...

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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15507998_v88_n11_p112003-1_Aad
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15507998_v88_n11_p112003-1_Aad
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spelling todo:paper_15507998_v88_n11_p112003-1_Aad2023-10-03T16:24:51Z Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector Aad, G. An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22:9 fb -1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are triggered in selected empty bunch crossings of the LHC in order to remove pp collision backgrounds. Selections based on jet shape and muon system activity are applied to discriminate signal events from cosmic ray and beam-halo muon backgrounds. In the absence of an excess of events, improved limits are set on gluino, stop, and sbottom masses for different decays, lifetimes, and neutralino masses. With a neutralino of mass 100 GeV, the analysis excludes gluinos with mass below 832 GeV (with an expected lower limit of 731 GeV), for a gluino lifetime between 10 μs and 1000 s in the generic R-hadron model with equal branching ratios for decays to (formula presented) and (formula presented). Under the same assumptions for the neutralino mass and squark lifetime, top squarks and bottom squarks in the Regge R-hadron model are excluded with masses below 379 and 344 GeV, respectively. © 2013 CERN. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v88_n11_p112003-1_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 An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22:9 fb -1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are triggered in selected empty bunch crossings of the LHC in order to remove pp collision backgrounds. Selections based on jet shape and muon system activity are applied to discriminate signal events from cosmic ray and beam-halo muon backgrounds. In the absence of an excess of events, improved limits are set on gluino, stop, and sbottom masses for different decays, lifetimes, and neutralino masses. With a neutralino of mass 100 GeV, the analysis excludes gluinos with mass below 832 GeV (with an expected lower limit of 731 GeV), for a gluino lifetime between 10 μs and 1000 s in the generic R-hadron model with equal branching ratios for decays to (formula presented) and (formula presented). Under the same assumptions for the neutralino mass and squark lifetime, top squarks and bottom squarks in the Regge R-hadron model are excluded with masses below 379 and 344 GeV, respectively. © 2013 CERN.
format JOUR
author Aad, G.
spellingShingle Aad, G.
Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
author_facet Aad, G.
author_sort Aad, G.
title Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
title_short Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
title_full Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
title_fullStr Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
title_full_unstemmed Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
title_sort search for long-lived stopped r-hadrons decaying out of time with pp collisions using the atlas detector
url http://hdl.handle.net/20.500.12110/paper_15507998_v88_n11_p112003-1_Aad
work_keys_str_mv AT aadg searchforlonglivedstoppedrhadronsdecayingoutoftimewithppcollisionsusingtheatlasdetector
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