TY  - JOUR
AU  - Kuhn, J. H.
AU  - Rodrigo, G.
PY  - 2012
DA  - 2012//
TI  - Charge asymmetries of top quarks at hadron colliders revisited
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 063
EP  - 25pp
VL  - 01
IS  - 1
PB  - Springer
KW  - Heavy Quark Physics
KW  - Hadronic Colliders
KW  - Standard Model
KW  - Beyond Standard Model
AB  - A sizeable difference in the differential production cross section of top-compared to antitop-quark production, denoted charge asymittetm 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 LHe 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 it 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 tt-momentum distribution. Predictions for similar measurements at the LHC are presented, demonstrating the sensitivity of the large rapidity region bot ti to the Standard Model contribution and effects from "new physics".
SN  - 1126-6708
UR  - http://arxiv.org/abs/1109.6830
UR  - https://doi.org/10.1007/JHEP01(2012)063
DO  - 10.1007/JHEP01(2012)063
LA  - English
N1  - WOS:000300181800063
ID  - Kuhn+Rodrigo2012
ER  -