2013/02/14 by Joachim Brod, Brod, Joachim
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.1302.3542
5 pages, 1 figure; Proceedings of CKM 2012, the 7th International Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28 September - 2 October 2012
arxiv created 2013/02/14 · arxiv updated 2013/02/15
The LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, Delta ACP, in the D0 -> K+ K- and D0 -> pi+ pi- decay modes. We show that this measurement can be plausibly explained within the standard model under the assumption of large penguin contractions matrix elements and nominal U-spin breaking. A consistent picture arises, accommodating the large difference between the decay rates, and the measured decay rates of the D -> K pi modes.