MSSM effects in top-antitop production at the LHC

Abstract

Abstract:We report on a calculation of the effects of supersymmetry on the cross-section for top-antitop production at LHC. A numerical study is carried out for the ten benchmarks of the Snowmass accord. It is found that the higher order effects involving supersymmetric particles in internal loops can be as high as 6%, both for the cross-section and the (parity even) helicity asymmetry, for one particular benchmark. For other benchmarks smaller but nonetheless observable corrections are found.

Top-quark physics at the LHC

“…(In this paper earlier discrepancies in the literature [239,240] were resolved.) The corrections due to the exchange of colour-singlet supersymmetric particles were calculated by [236,237,241,242], and more recently by [243] which incorporated also the SQCD corrections.…”

MSSM corrections to the top–antitop quark forward–backward asymmetry at the Tevatron

“…The SUSY QCD and SUSY EW oneloop corrections to (unpolarized) t t production in hadronic collisions have been studied in Refs. [24][25][26][27][28][29][30][31] and Refs. [31][32][33][34][35], respectively.…”

“…[24][25][26][27][28][29][30][31] and Refs. [31][32][33][34][35], respectively. They are known to only modestly impact the total t t production cross section and invariant t t mass distribution, and thus, at the presently available precision, do not spoil the good agreement between theory and experiment for those observables, at least for sparticle masses of O(100) GeV (and larger) and m g > ∼ 230 GeV [30].…”

Strong and electroweak supersymmetric corrections to single top processes at the Large Hadron Collider

“…However, they all are rather stable against variations of the factorisation and/or renormalisation scales (these in turn quantifying the systematic uncertanties related to the unknown two-loop, or even higher order, corrections), so that one can conceivably attempt to investigate virtual effects of some NP, particularly of SUSY origin, induced onto single-and double-top processes. To stay with the MSSM, QCD and EW corrections to double-top production have been quantified in [5] and [6], respectively, whilst only part of these are known to date for the case of single-top reactions [7].…”