Relating direct CP violation in D decays and the forward-backward asymmetry in tt̄ production

The CDF and LHCb experiments have recently provided two intriguing hints for new physics: a large forward-backward asymmetry in tt̄ production and a direct CP asymmetry in D decays of order of a percent. In both cases, flavor nonuniversal 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.