Abstract
We discuss a model in which the large SU(3) flavor violations in singly Cabibbo suppressed decays of neutral D mesons are ascribed exclusively to the final state interactions. The agreement with the experimental data on the branching ratios is obtained with large strong phase differences which are also necessary for substantial direct CP violation. While the value of the CP violating asymmetries depends on the strength of the penguin contribution, we predict an asymmetry for the decays into charged pions more than twice larger than that for charged kaons and having opposite sign.
Highlights
IntroductionAt the end of 2011 LHCb Collaboration measured the difference in the CP-violating asymmetries between the two decay channels D → K+K− and D → π+π− obtaining [3]
At the end of 2011 LHCb Collaboration measured the difference in the CP-violating asymmetries between the two decay channels D → K+K− and D → π+π− obtaining [3]ΔACP = ACP(K+K−) − ACP(π+π−) = (−0.82 ± 0.21 ± 0.11)% . (1)This result was confirmed by the measurements of CDF [4] and Belle [5] CollaborationsΔACP = (−0.62 ± 0.21 ± 0.10)%, ΔACP = (−0.87 ± 0.41 ± 0.06)%, (2)respectively
The agreement with the experimental data on the branching ratios is obtained with large strong phase differences which are necessary for substantial direct CP violation
Summary
At the end of 2011 LHCb Collaboration measured the difference in the CP-violating asymmetries between the two decay channels D → K+K− and D → π+π− obtaining [3]. The theoretical community have interpreted these results by considering them as a sign of New Physics [7] or compatible with the Standard Model [8, 9]. In the following we will show the main ideas and the results obtained in our paper [10]
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