Abstract
Among other roles the LHC will play the role of a ``top factory'' giving us an unique possibility to study possible new physics signatures in unprecedented ways. Many scenarios of new physics (NP) allow top quark flavour changing neutral current (FCNC) decays. Using the most general model independent Lagrangian we investigate possible experimental signals of new physics in t → c(u)l+l− FCNC top decays. We find that a measurement of two possible angular asymmetries might give very important and interesting information on the structure of NP contributions. It is particularly interesting to use these observables to discriminate among variety of NP scenarios. Among others, we consider contributions due to the interference between scalar and vector mediators of these FCNC decays.
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