Relating direct CP violation in D decays and the forward-backward asymmetry in $t\bar{t}$ production

Abstract

The CDF and LHCb experiments have recently provided two intriguing hints for new physics: a large forward-backward asymmetry in $t\bar{t}$ production, and a direct CP asymmetry in D decays of order a percent. In both cases, flavor non-universal interactions are required in the up sector, raising the possibility that the two effects come from one and the same new physics source. We show that a minimal model, with an extra scalar doublet, previously suggested to explain the top data, gives -- without any modifications or additions -- a contribution to CP violation in charm decays that is of the right size.

Comments: 4 pages. v3: A calculation of the contribution to epsilon^prime is presented; Conclusions unchanged