Sgoldstino events in top decays at the LHC

We study top-quark decays in models with light sgoldstinos. The off-diagona l entries in the squark mass matrices can lead to FCNC top two-body decays into a sgoldstino and a c (or u) quark. We compute the rates for these deca ys and discuss the corresponding signatures that could manifest the presenc e of sgoldstinos in top decays at the LHC. We expect that a supersymmetry b reaking parameter rootF up to a scale of order 10 TeV could be probed throu gh this process, for a maximal squark mixing with the third generation. Jus tified by our preliminary analysis, a thorough study of the corresponding s ignal versus background and systematics in the LHC environment would be mos t welcome, in order to accurately assess the potential of this promising pr ocess in determining rootF. (C) 2001 published by Elsevier Science B.V.