Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV

The results of a search for pair production of the lighter scalar partners of top quarks (<math><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜<...

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Autores principales: Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín F., The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Exactas
Física
ATLAS detector
scalar top quark pair production
supersymmetry
pp collisions
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/77531
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-77531
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
Física
ATLAS detector
scalar top quark pair production
supersymmetry
pp collisions
spellingShingle Ciencias Exactas
Física
ATLAS detector
scalar top quark pair production
supersymmetry
pp collisions
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
topic_facet Ciencias Exactas
Física
ATLAS detector
scalar top quark pair production
supersymmetry
pp collisions
description The results of a search for pair production of the lighter scalar partners of top quarks (<math><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math>) in 2.05 fb−1 of pp collisions at <math><msqrt is="true"><mi is="true">s</mi></msqrt><mo is="true">=</mo><mn is="true">7</mn></math> TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (<math><mi is="true">e</mi><mo is="true">,</mo><mi is="true">μ</mi></math>) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking ‘natural’ scenarios, where the neutralino (<math><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></math>) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for <math><mn is="true">115</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext><mo is="true">&lt;</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">&lt;</mo><mn is="true">230</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> at 95% confidence level, reaching an exclusion of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></mrow></msub><mo is="true">&lt;</mo><mn is="true">330</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> for <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">=</mo><mn is="true">190</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math>. Scalar top quark masses below 240 GeV are excluded for all values of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">&gt;</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><mi is="true">Z</mi></mrow></msub></math>.
format Articulo
Articulo
author Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_facet Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_sort Anduaga, Xabier Sebastián
title Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_short Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_full Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_fullStr Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_full_unstemmed Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_sort search for scalar top quark pair production in natural gauge mediated supersymmetry models with the atlas detector in pp collisions at √s = 7 tev
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/77531
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