Shedding light on the t(t)over-bar asymmetry: the photon handle

We investigate a charge asymmetry in t (t) over bar gamma production at the LHC that provides complementary information to the measured asymmetries in t (t) over bar production. We estimate the experimental uncertainty in its measurement at the LHC with 8TeV and 14TeV. We argue that, for new physics models that simultaneously reproduce the asymmetry excess in t (t) over bar production at the Tevatron and the SM- like asymmetry at the LHC, the measurement in t (t) over bar gamma production at the LHC is likely to deviate from the SMprediction. In two new physics models studied in detail we find that the deviations could be significant and observable at the 14TeV run.