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<SUP>-1</SUP> of pp collisions at 7 and 8 TeV, respectively. Candida...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Exactas
Supersymmetry
Collisions
Squark pair
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85249
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85249
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Supersymmetry
Collisions
Squark pair
spellingShingle Ciencias Exactas
Supersymmetry
Collisions
Squark pair
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector
topic_facet Ciencias Exactas
Supersymmetry
Collisions
Squark pair
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<SUP>-1</SUP> 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 qqχ<SUP>0</SUP> and gχ<SUP>0</SUP>. 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.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
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
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85249
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AT anduagaxabiersebastian searchforlonglivedstoppedrhadronsdecayingoutoftimewithppcollisionsusingtheatlasdetector
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AT tripianamartinfernando searchforlonglivedstoppedrhadronsdecayingoutoftimewithppcollisionsusingtheatlasdetector
AT theatlascollaboration searchforlonglivedstoppedrhadronsdecayingoutoftimewithppcollisionsusingtheatlasdetector
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