Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector

An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integra...

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Guardado en:
Detalles Bibliográficos
Publicado: 2015
Materias:
Beyond Standard Model
chiral b’
Exotics
four-top-production
Hadron-Hadron Scattering
Lepton production
same charge top pair
vector-like quarks
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2015_n10_p1_TheATLAScollaboration
http://hdl.handle.net/20.500.12110/paper_11266708_v2015_n10_p1_TheATLAScollaboration
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_11266708_v2015_n10_p1_TheATLAScollaboration
record_format dspace
spelling paper:paper_11266708_v2015_n10_p1_TheATLAScollaboration2023-06-08T16:08:36Z Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector Beyond Standard Model chiral b’ Exotics four-top-production Hadron-Hadron Scattering Lepton production same charge top pair vector-like quarks An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb −1 of pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced four-top-quark production, pair production of chiral b′-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b′-quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models. © 2015, The Author(s). 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2015_n10_p1_TheATLAScollaboration http://hdl.handle.net/20.500.12110/paper_11266708_v2015_n10_p1_TheATLAScollaboration
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Beyond Standard Model
chiral b’
Exotics
four-top-production
Hadron-Hadron Scattering
Lepton production
same charge top pair
vector-like quarks
spellingShingle Beyond Standard Model
chiral b’
Exotics
four-top-production
Hadron-Hadron Scattering
Lepton production
same charge top pair
vector-like quarks
Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector
topic_facet Beyond Standard Model
chiral b’
Exotics
four-top-production
Hadron-Hadron Scattering
Lepton production
same charge top pair
vector-like quarks
description An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb −1 of pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced four-top-quark production, pair production of chiral b′-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b′-quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models. © 2015, The Author(s).
title Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector
title_short Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector
title_full Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector
title_fullStr Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector
title_full_unstemmed Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 TeV with the ATLAS detector
title_sort analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at √s=8 tev with the atlas detector
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2015_n10_p1_TheATLAScollaboration
http://hdl.handle.net/20.500.12110/paper_11266708_v2015_n10_p1_TheATLAScollaboration
_version_ 1768546550702669824

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