Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 18: Beyond the Standard Model (Theorie) II

T 18.3: Talk

Tuesday, March 16, 2010, 17:15–17:30, HG XIV

Gluino Polarization at the LHC — Michael Krämer¹, •Eva Popenda², Michael Spira³, and Peter Zerwas^1,4 — ¹Institut für Theoretische Physik E, RWTH Aachen University, Aachen, Germany — ²Institut für Theoretische Physik, KIT, Karlsruhe, Germany — ³Paul Scherrer Institut, Villigen, Switzerland — ⁴Deutsches Elektronen-Synchroton DESY, Hamburg, Germany

The Minimal Supersymmetric Standard Model [MSSM] predicts the copious production of gluinos at the LHC: Gluino pairs in quark-antiquark and gluon-gluon collisions qq,gg → gg and single gluinos in association with squarks in the super-Compton process qg → q g. While the contribution of the individual polarization of gluinos in gluino pair production can be neglected when the mass difference between L and R squarks of the first two generations is small, the spin-spin correlations within gluino pairs and the gluino polarization in single gluino production are predicted to have sizable effects on the cross sections. The subsequent gluino decay into quarks and squarks is sensitive to the gluino spin, so that final-state distributions of the decay chains are affected by the polarization of the gluinos. We analyze the impact of gluino polarization on invariant di-jet masses in reconstructed final states.