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 — preprints:2011:ttp11-26 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP11-26 Charge asymmetries of top quarks at hadron colliders revisited ====== + + + A sizeable difference in the differential production cross section of top- compared to antitop-quark production, denoted charge asymmetry, has been observed at the Tevatron. The experimental results seem to exceed the theory predictions based on the Standard Model by a significant amount and have triggered a large number of suggestions for "new physics". In the present paper the Standard Model predictions for Tevatron and LHC experiments are revisited. This includes a reanalysis of electromagnetic as well as weak corrections, leading to a shift of the asymmetry by roughly a factor 1.1 when compared to the results of the first papers on this subject. The impact of cuts on the transverse momentum of the top-antitop system is studied. Restricting the ttbar system to a transverse momentum less than 20 GeV leads to an enhancement of the asymmetries by factors between 1.3 and 1.5, indicating the importance of an improved understanding of the $t\bar t$-momentum distribution. Predictions for similar measurements at the LHC are presented, demonstrating the sensitivity of the large rapidity region both to the Standard Model contribution and effects from "new physics".  + |**Johann H. Kühn, German Rodrigo **  | + |** JHEP 1201 063 2012  **  | + | {{preprints:2011:ttp11-26.pdf|PDF}} {{preprints:2011:ttp11-26.ps|PostScript}} [[http://arxiv.org/abs/1109.6830|arXiv]]   | + | |