Light Stop Decays

Abstract

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 $c{\tilde{\chi }}_1^0/u{\tilde{\chi }}_1^0$ or a four-body decay to $b{\tilde{\chi }}_1^{0}f{\bar{f}}^{\prime }$, which above the $W$ boson threshold corresponds to the decay to $b{\tilde{\chi }}_1^{0}W$. 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.

arXiv commentTo appear in the proceedings of the 27th Rencontres the Blois on Particle Physics and Cosmology, May 31 - June 05, 2015