Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/39954

TitleAnalysis 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
Author(s)Onofre, A.
Castro, Nuno Filipe Silva Fernandes
ATLAS Collaboration
KeywordsBeyond Standard Model
chiral b’
Exotics
four-top-production
Hadron-Hadron Scattering
Lepton production
same charge top pair
vector-like quarks
Issue date2015
PublisherSpringer Verlag
JournalJournal of High Energy Physics
CitationAad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., . . . Zwalinski, L. (2015). 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. Journal of High Energy Physics, 2015(10), 1-51. doi: 10.1007/jhep10(2015)150
Abstract(s)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.
TypeArticle
URIhttp://hdl.handle.net/1822/39954
DOI10.1007/jhep10(2015)150
ISSN1029-8479
Peer-Reviewedyes
AccessOpen access
Appears in Collections:LIP - Artigos/papers

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