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We investigate the flavour-changing neutral current decay of the lighteststop into a charm quark and the lightest neutralino and its four-body decayinto the lightest neutralino, a down-type quark and a fermion pair. These arethe relevant stop search channels in the low-mass region. The SUSY-QCDcorrections to the two-body decay have been calculated for the first time andturn out to be sizeable. In the four-body decay both the contributions fromdiagrams with flavour-changing neutral current (FCNC) couplings and the masseffects of final state bottom quarks and $\tau$ leptons have been taken intoaccount, which are not available in the literature so far. The resultingbranching ratios are investigated in detail. We find that in either of thedecay channels the branching ratios can deviate significantly from one in largeparts of the allowed parameter range. Taking this into account, theexperimental exclusion limits on the stop, which are based on the assumption ofbranching ratios equal to one, are considerably weakened. This should be takeninto account in future searches for light stops at the next run of the LHC,where the probed low stop mass region will be extended.

Light Stop Decays: Implications for LHC Searches