W. M. Moesle | Searcharxiv

arXiv1997

MSSM Radiative Corrections to the Top Pair Production Processes at Hadron Colliders

We calculate the MSSM $O(α)$ corrections to the main production processes of strong top pair production at the upgraded Tevatron and at the LHC. In exploring the potential of future hadron colliders for performing electroweak precision physics we study their effects on the total hadronic cross sections, the invariant $t\bar t$ mass distributions and give first results for parity violating asymmetries in the production of left and right handed top quarks.

hep-ph↗

arXiv1997

Top Pair Production at Hadron Colliders in non-minimal Standard Models

The cross section of top pair production in hadronic collisions to O(alpha α_s^2) is calculated within the General 2-Higgs-Doublet Model and the Minimal Supersymmetric Standard Model. At the parton level the O(alpha) one-loop corrections to the main production mechanisms, quark-antiquark annihilation and gluon fusion, significantly modify the Born-cross sections: in the threshold region \sqrt{\hat s}>~2 m_t they are enhanced up to 50 % and with increasing cm energy \sqrt{\hat s}, they can be reduced by up to the same order of magnitude. In a wide range of the parameter space of the models under consideration the observable hadronic cross sections for top pair production at the Tevatron and at the LHC are typically reduced by several percent (<~10 %) compared to the lowest order result. In special regions of the parameter space, that is in the vicinity of the threshold for the top quark decay t \to b H^+ ; \tilde t \tilde χ^0, the radiative corrections are considerably enhanced, comparable in size to QCD effects.

hep-ph↗