Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - 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
AU - Barton, Adam Edward
AU - Beattie, Michael
AU - Borissov, Guennadi
AU - Dearnaley, William
AU - Fox, Harald
AU - Grimm, Kathryn Ann Tschann
AU - Henderson, Robert Charles William
AU - Hughes, Gareth
AU - Jones, Roger William Lewis
AU - Kartvelishvili, Vakhtang
AU - Long, Robin Eamonn
AU - Love, Peter Allan
AU - Maddocks, Harvey
AU - Skinner, Malcolm
AU - Walder, James William
AU - Wharton, Andy
AU - The ATLAS collaboration
PY - 2015/10
Y1 - 2015/10
N2 - An analysis is presented of events containing jets including at least one btaggedjet, sizeable missing transverse momentum, and at least two leptons including apair of the same electric charge, with the scalar sum of the jet and lepton transversemomenta being large. A data sample with an integrated luminosity of 20.3 fb−1 of pp collisionsat √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 modelsof physics beyond the Standard Model that predict an enhanced rate of production ofsuch events; the ones considered here are production of vector-like quarks, enhanced fourtop-quarkproduction, pair production of chiral b0-quarks, and production of two positivelycharged top quarks. Eleven signal regions are defined; subsets of these regions are combinedwhen searching for each class of models. In the three signal regions primarily sensitive topositively charged top quark pair production, the data yield is consistent with the backgroundexpectation. There are more data events than expected from background in the setof eight signal regions defined for searching for vector-like quarks and chiral b0-quarks, butthe significance of the discrepancy is less than two standard deviations. The discrepancyreaches 2.5 standard deviations in the set of five signal regions defined for searching forfour-top-quark production. The results are used to set 95% CL limits on various models.
AB - An analysis is presented of events containing jets including at least one btaggedjet, sizeable missing transverse momentum, and at least two leptons including apair of the same electric charge, with the scalar sum of the jet and lepton transversemomenta being large. A data sample with an integrated luminosity of 20.3 fb−1 of pp collisionsat √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 modelsof physics beyond the Standard Model that predict an enhanced rate of production ofsuch events; the ones considered here are production of vector-like quarks, enhanced fourtop-quarkproduction, pair production of chiral b0-quarks, and production of two positivelycharged top quarks. Eleven signal regions are defined; subsets of these regions are combinedwhen searching for each class of models. In the three signal regions primarily sensitive topositively charged top quark pair production, the data yield is consistent with the backgroundexpectation. There are more data events than expected from background in the setof eight signal regions defined for searching for vector-like quarks and chiral b0-quarks, butthe significance of the discrepancy is less than two standard deviations. The discrepancyreaches 2.5 standard deviations in the set of five signal regions defined for searching forfour-top-quark production. The results are used to set 95% CL limits on various models.
U2 - 10.1007/JHEP10(2015)150
DO - 10.1007/JHEP10(2015)150
M3 - Journal article
VL - 10
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1029-8479
M1 - 150
ER -