Light Stop Decays

If the stop is the next-to-lightest supersymmetric particle (NLSP) and the mass difference to the neutralino is smaller than the top mass, it can decay via flavour-violating decay modes to $c\tildeχ^0_1/u\tildeχ^0_1$ or a four-body decay to $b\tildeχ_1^0f\bar{f}'$, which above the $W$ boson threshold corresponds to the decay to $b\tildeχ_1^0W$. Improving on existing calculations for these decay modes, we analyse the branching ratios (BRs) for the respective decays and show that they can significantly deviate from one.

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