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 -