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Special supersymmetric features of stop-chargino production at LHC
M. Beccaria1, G. Macorini2, L. Panizzi2, Fernand Michel Renard3, C. Verzegnassi2

The process of stop-chargino production at LHC has been calculated in the Minimal Supersymmetric Standard Model at the complete electroweak 1-loop level, assuming a mSUGRA symmetry breaking scheme. Several remarkable properties of the angular and invariant mass distributions of the basic $b~g\to\tilde{t}_a~ \chi^-_i$ amplitudes have been derived. For a vast collection of different benchmark points the overall 1-loop effects are of the order of a relative few percent. From a partial scanning of single parameters performed at Born level, a strong dependence of the rates on the stop mixing angle and a correlation with tanbeta have been evidentiated.
1 :  INFN, Sezione di Lecce - Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2 :  INFN, Sezione di Trieste - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
3 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
Physique/Physique des Hautes Energies - Phénoménologie
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