Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector

The results of a search for top squark (stop) pair production in final states with one isolated lepton, jets, and missing transverse momentum are reported. The analysis is performed with proton-proton collision data at √s = 8TeV collected with the ATLAS detector at the LHC in 2012 corresponding to a...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/80001
Aporte de:
id I19-R120-10915-80001
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
hadron-hadron scattering
proton-proton scattering
supersymmetry
top squark
spellingShingle Ciencias Exactas
Física
hadron-hadron scattering
proton-proton scattering
supersymmetry
top squark
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector
topic_facet Ciencias Exactas
Física
hadron-hadron scattering
proton-proton scattering
supersymmetry
top squark
description The results of a search for top squark (stop) pair production in final states with one isolated lepton, jets, and missing transverse momentum are reported. The analysis is performed with proton-proton collision data at √s = 8TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20 fb<sup>−1</sup>. The lightest supersymmetric particle (LSP) is taken to be the lightest neutralino which only interacts weakly and is assumed to be stable. The stop decay modes considered are those to a top quark and the LSP as well as to a bottom quark and the lightest chargino, where the chargino decays to the LSP by emitting a W boson. A wide range of scenarios with different mass splittings between the stop, the lightest neutralino and the lightest chargino are considered, including cases where the W bosons or the top quarks are off-shell. Decay modes involving the heavier charginos and neutralinos are addressed using a set of phenomenological models of supersymmetry. No significant excess over the Standard Model prediction is observed. A stop with a mass between 210 and 640GeV decaying directly to a top quark and a massless LSP is excluded at 95% confidence level, and in models where the mass of the lightest chargino is twice that of the LSP, stops are excluded at 95% confidence level up to a mass of 500 GeV for an LSP mass in the range of 100 to 150 GeV. Stringent exclusion limits are also derived for all other stop decay modes considered, and model-independent upper limits are set on the visible cross-section for processes beyond the Standard Model.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector
title_short Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector
title_full Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector
title_fullStr Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector
title_full_unstemmed Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector
title_sort search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in √s = 8tev pp collisions with the atlas detector
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/80001
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