A. Bartl, H. Eberl, E. Ginina, B. Herrmann, K. Hidaka, W. Majerotto, W. Porod
We study quark flavour violation (QFV) in the squark sector of the Minimal Supersymmetric Standard Model (MSSM). We assume mixing between the second and the third squark generation i.e. $\sc_{L, R}-\st_{L, R}$ mixing. We focus on QFV effects in bosonic squark decays, in particular in the decay into the lightest Higgs boson, $\su_2 \to \su_1 h^0$, where $\su_{1,2}$ are the lightest up-type squarks. We show that the branching ratio of this QFV decay can be quite large (up to 60 %) due to large QFV trilinear couplings, and large $\sc_{L, R}-\st_{L, R}$ and $\st_{L}-\st_{R}$ mixing, despite the strong constraints on QFV from B meson data. This can result in remarkable QFV signatures with significant rates at LHC, such as $pp \to \sg \sg X \to \su_{1,2}\bar{t} \su_2 \bar{c} X \to \su_{1,2}\bar{t} \su_1 h^0 \bar{c} X \to c \nt_1 \bar{t} c \nt_1 h^0 \bar{c} X (= c \bar{t} c\bar{c} h^0\etmiss X$). The QFV bosonic squark decays can have an influence on the squark and gluino searches at LHC and can play a role in the determination of the MSSM parameters, in particular of the QFV trilinear couplings.
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http://arxiv.org/abs/1212.4688
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