Charge asymmetries of top quarks at hadron colliders revisited
By J. Kühn, G. Rodrigo. 2011
184 citations recorded by the source corpus.
A bstractA 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 $ t\overline t $ 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\overline 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”.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3c8c1b29b1ec34173321fc3765e4bc035e58fe19
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Nuclear and High Energy Physics
- M. Zaro
- D. Pagani
- Valentin Hirschi
- Cms Collaboration
- Hua-Sheng Shao
- Stefano Frixione
- Gudrun Heinrich
- Atlas Collaboration
Citations in the corpus
- Weak corrections to Higgs hadroproduction in association with a top-quark pair (2014, result): “The purpose of this work is to amend this situation, and to present the first calculation of such corrections; similarly to what has been done as a first step in the case of tt̄ hadroproduction [35–39], we do not include in our results effects of QED origin (dealt with in later papers [40–43] for tt”