Flavour violating gluino three-body decays at LHC

Abstract

We study the effect of squark generation mixing on gluino production and decays at LHC in the Minimal Supersymmetric Standard Model (MSSM) for the case that the gluino is lighter than all squarks and dominantly decays into three particles, $gl->qqbarneu{t}_k,gl->qqba{r}^{\prime }cha{r}_l$. We assume mixing between the second and the third squark generations in the up-type and down-type squark sectors. We show that this mixing can lead to very large branching ratios of the quark-flavour violating gluino three-body decays despite the strong constraints on quark-flavour violation (QFV) from the experimental data on B mesons. We also show that the QFV gluino decay branching ratios are very sensitive not only to the generation mixing in the squark sector, but also to the parameters of the neutralino and chargino sectors. We show that the branching ratio of the QFV gluino decay $gl->ctbar(cbart)neu{t}_1$ can go up to ~ 40%. Analogously, that of the QFV decay $gl->sbbar(sbarb)neu{t}_1$ can reach ~35%. We find that the rates of the resulting QFV signatures, such as $pp->ttcbarcbar{E}_T^{m}is$, can be significant at LHC. This could have an important influence on the gluino searches at LHC.

19 pages, 10 figures. References updated, typos corrected, wording improved

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• Flavor of Gluino Decay in High-Scale Supersymmetry
• $h^0\to c\bar{c}$ as a test case for quark flavor violation in the MSSM
• Phenomenology of anomaly-mediated supersymmetry breaking scenarios with non-minimal flavour violation
• Flavour-violating decays of mixed top-charm squarks at the LHC
• Flavour violating bosonic squark decays at LHC
• Two-body decays of gluino at full one-loop level in the quark-flavour violating MSSM
• Non-minimal flavour violation in $A_4\times SU(5)$ SUSY GUTs with smuon assisted dark matter
• Data-driven analysis of a SUSY GUT of flavour
• Vacuum Stability Constraints on Flavor Mixing Parameters and Their Effect on Gluino Decays
• Gluino two-body decays at full one-loop level in the MSSM with quark-flavour violation