Institute for Theoretical Particle Physics (TTP)

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preprints:2011:ttp11-26 [2016/03/17 11:03] (current)
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 +====== TTP11-26 Charge asymmetries of top quarks at hadron colliders revisited ====== 
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 +   <hidden 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" </hidden> 
 +|**Johann H. K&uuml;hn, 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]]   | 
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