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Measurements of tt‾ charge asymmetry using dilepton final states in pp collisions at √s=8TeV

CMS Collaboration; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann,N.; Hrubec, J.; Jeitler, M.; König, A.; ... mehr



Abstract (englisch): The charge asymmetry in tt‾ events is measured using dilepton final states produced in pp collisions at the LHC at s=8TeV . The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5fb−1 . The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The tt‾ and leptonic inclusive charge asymmetries are found to be 0.011±0.011(stat)±0.007(syst) and 0.003±0.006(stat)±0.003(syst) , respectively. These results, as well as charge asymmetry measurements made as a function of the invariant mass, rapidity, and transverse momentum of the tt‾ system, are in agreement with predictions of the standard model.


Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1016/j.physletb.2016.07.006
ISSN: 0370-2693, 1873-2445
URN: urn:nbn:de:swb:90-583231
KITopen ID: 1000058323
Erschienen in Physics letters / B
Band 760
Seiten 365–386
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Lizenz: Dieses Werk ist lizenziert unter CC BY 3.0 DE
Schlagworte CMS; Physics; Top; Charge asymmetry
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