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Charge asymmetries of top quarks at hadron colliders revisited

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Charge asymmetries of top quarks at hadron colliders revisited

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dc.contributor.author Kühn, Johann H.
dc.contributor.author Rodrigo García, Germán Vicente
dc.date.accessioned 2015-06-19T10:59:17Z
dc.date.available 2015-06-19T10:59:17Z
dc.date.issued 2012
dc.identifier.citation Kühn, Johann H. Rodrigo García, Germán Vicente 2012 Charge asymmetries of top quarks at hadron colliders revisited Journal of High Energy Physics 01 1 063
dc.identifier.uri http://hdl.handle.net/10550/44601
dc.description.abstract 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'.
dc.language.iso eng
dc.relation.ispartof Journal of High Energy Physics, 2012, vol. 01, num. 1, p. 063
dc.subject Física
dc.title Charge asymmetries of top quarks at hadron colliders revisited
dc.type journal article es_ES
dc.date.updated 2015-06-19T10:59:17Z
dc.identifier.doi 10.1007/JHEP01(2012)063
dc.identifier.idgrec 074455
dc.rights.accessRights open access es_ES

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