Stop searches in flavourful supersymmetry

Abstract

Natural realisations of supersymmetry require light stops ${\tilde{t}}_1$, making them a prime target of LHC searches for physics beyond the Standard Model. Depending on the kinematic region, the main search channels are ${\tilde{t}}_1\to t{\tilde{\chi }}_1^0$, ${\tilde{t}}_1\to Wb{\tilde{\chi }}_1^0$ and ${\tilde{t}}_1\to c{\tilde{\chi }}_1^0$. We first examine the interplay of these decay modes with ${\tilde{c}}_1\to c{\tilde{\chi }}_1^0$ in a model-independent fashion, revealing the existence of large regions in parameter space which are excluded for any ${\tilde{t}}_1\to c{\tilde{\chi }}_1^0$ branching ratio. This effect is then 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 LHC bounds from ${\tilde{c}}_1\to c{\tilde{\chi }}_1^0$ searches are taken into account, non-zero stop-scharm mixing leads only to a modest increase in the allowed regions of parameter space, with large areas excluded for arbitrary mixing angles.

arXiv comment19 pages, 9 figures

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