Measurement of the mass difference between top quark and antiquark in pp collisions at √s=8 TeV

CMS Collaboration; Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; ... mehr

Abstract:
The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark (View the MathML source Δm$_{t}$=m$_{t}$−mt$_{t}$) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 fb$^{-1}$ collected by the CMS experiment at the LHC, and yields a value of View the MathML source Δm$_{t}$=−0.15±0.19(stat)±0.09(syst) GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.

 Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP) Publikationstyp Zeitschriftenaufsatz Jahr 2017 Sprache Englisch Identifikator ISSN: 0370-2693, 1873-2445 URN: urn:nbn:de:swb:90-702203 KITopen ID: 1000070220 Erschienen in Physics letters / B Band 770 Seiten 50-71 Bemerkung zur Veröffentlichung Gefördert durch SCOAP3 Schlagworte CMS; Top quark physics
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