A very light scalar top (stop) superpartner is motivated by naturalness and electroweak baryogenesis. When the mass of the stop is less than the sum of the masses of the top quark and the lightest neutralino superpartner χ₁⁰, as well as the of the masses of the lightest chargino and the bottom quark, the dominant decay channels of the stop will be three-body (3B: bW⁺χ₁⁰), four-body (4B: bff̄^'χ₁⁰), or flavor violating (FV: cχ₁⁰). In this work, we investigate the direct and indirect constraints on a light stop, we compute the relative decay branching fractions to these channels, and we study the sensitivity of existing LHC searches to each of them.
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Krizka et al. (2013) studied this question.
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