Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 407: BSM Theorie II

T 407.1: Talk

Thursday, March 8, 2007, 16:45–17:00, KIP SR 2.402

EW Corrections to Pair Production of Top-Squarks within the MSSM — Wolfgang Hollik, Monika Kollar, and •Maike Trenkel — Max-Planck-Institut für Physik, D-80805 München

Searches for potential physics beyond the Standard Model constitute an important part of the LHC discovery programme. In this context, pair production of top-squarks is of particular interest. Within the Minimal Supersymmetric Standard Model (MSSM), the top-squark being the superpartner of the top-quark is a candidate for the lightest squark owing to the large L-R squark mixing.

As the cross-section for the top-squark pair production depends essentially on the stop mass, it is possible to extract the top-squark mass directly from the cross-section measurement in case of a discovery.

Besides the already calculated SUSY-QCD radiative corrections, also the SUSY-EW contributions are required for a reliable prediction. We investigate the impact of SUSY-EW corrections on the top-squark pair production cross-section. The full set of one-loop contributions is UV and IR finite after including the real photon bremsstrahlung. The mass singularities which originate from the radiation of collinear photons off the initial-state light quarks are absorbed into the parton distribution functions (PDF) via factorization at the NLO QED level.

Presented are distributions of the hadronic cross-section as a function of the invariant mass of the top-squark pair and of the transverse momentum of one of the top-squarks. We also apply cuts on the final state particles to obtain experimentally realistic results.