Weak interaction effects in top-quark pair production at hadron colliders

Abstract

Top-quark physics plays an important rôle at hadron colliders such as the Tevatron collider at Fermilab or the upcoming Large Hadron Collider (LHC) at CERN. Given the planned experimental precision, detailed theoretical predictions are mandatory. In this article we present analytic results for the complete electroweak corrections to gluon induced top-quark pair production, completing our earlier results for the quark-induced reaction. As an application we discuss top-quark pair production at Tevatron and at LHC. In particular we show that, although small for inclusive quantities, weak corrections can be sizeable for differential distribution.

Two-loop leading color corrections to heavy-quark pair production in the gluon fusion channel

“…(2.3) arises from the interference of one-loop diagrams with the tree-level amplitude [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The O(α 2 S ) term A 2 consists of two parts, the interference of two-loop diagrams with the Born amplitude and the interference of one-loop diagrams among themselves: The term A (1×1) 2 was derived in [87][88][89][90].…”

“…Most of the observables related to the top-quark pair production have been calculated up to NLO [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In several cases, the next-to-leading (NLO) corrections have been supplemented by the resummation of large logarithmic corrections at leading (LL, [25][26][27][28][29][30][31]), next-to-leading (NLL, [32][33][34][35][36][37][38]) and next-to-next-to-leading logarithmic (NNLL, [39][40][41][42][43]) accuracy.…”

Electroweak corrections to W-boson pair production at the LHC

“…This potentially includes real photon radiation, virtual photon exchange and terms suppressed by M 2 W /ŝ, whereŝ denotes the partonic center-of-mass (CM) energy squared. Up to now these one-loop corrections have been evaluated for various SM benchmark processes, including tt production [27][28][29] (for earlier studies see ref. [30]), bb production [31], SM-Higgs production [32][33][34][35] and decay [36][37][38][39], and dijet production, where the purely weak corrections are known [40,41].…”

MSSM effects in top-antitop production at the LHC

“…[20]. Note that whereas the weak corrections reported in [31,20] decrease the prediction for the cross-sections, the SUSY corrections have a positive sign for most of the benchmarks considered. Statistically, we expect these events to be easily detectable given the anticipated yield of order 10 7 events over the period of running of the LHC.…”