Stop searches in flavourful supersymmetry

Crivellin, Andreas; Haisch, Ulrich; Tunstall, Lewis (2016). Stop searches in flavourful supersymmetry. Journal of High Energy Physics, 2016(9), 080. Springer 10.1007/JHEP09(2016)080

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Natural realisations of supersymmetry require light stops t ̃ , making them a prime target of LHC searches for physics beyond the Standard Model. Depending on the kinematic region, the main search channels are t ̃ → tχ ̃0, t ̃ → Wbχ ̃0 and t ̃ → cχ ̃0. We first examine the interplay of these decay modes with ̃c1 → cχ ̃01 in a model-independent fashion, revealing that a large parameter space region with stop mass values m ̃ up to 530GeV is excluded for any t ̃ → cχ ̃0 branching ratio by LHC Run I data. The impact of c ̃1 → cχ ̃01 decays is further illustrated for scenarios with stop-scharm mixing in the right-handed sector, where it has previously been observed that the stop mass limits can be significantly weakened for large mixing. Our analysis shows that once the ̃c1 → cχ ̃01 bounds are taken into account, non-zero stop-scharm mixing can lead to an increase in the allowed parameter space by at most 35%, with large areas excluded for arbitrary mixing.

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