Impact of squark generation mixing on the search for gluinos at LHC

Understand

We study gluino decays in the Minimal Supersymmetric Standard Model (MSSM) with squark generation mixing.

• We show that the effect of this mixing on the gluino decay branching ratios can be very large in a significant part of the MSSM parameter space despite the very strong experimental constraints on quark flavour violation (QFV) from B meson observables.
• Especially we find that under favourable conditions the branching ratio of the the QFV gluino decay gluino -> c bar{t} (bar{c} t) + neutralino_1 can be as large as about 50%.
• We also find that the squark generation mixing can result in a multiple-edge (3- or 4-edge) structure in the charm-top quark invariant mass distribution.