The Standard Model confronts CP violation in D0→ π+π− and D0→ K+K−

被引：0
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作者：
Enrico Franco
Satoshi Mishima
Luca Silvestrini
机构：
[1] INFN,
来源：
Journal of High Energy Physics | / 2012卷
关键词：
Rare Decays; Heavy Quark Physics; CP violation;
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摘要：
The recently measured direct CP asymmetries in the processes D0→ π+π− and D0→ K+K− show a significant deviation from the naive Standard Model expecta- tion. Using a general parameterization of the decay amplitudes, we show that the measured branching ratios imply large SU(3) breaking and large violations of the naive 1/Nc counting. Furthermore, rescattering constrains the I = 0 amplitudes in the ππ and KK channels. Combining all this information, we show that, with present errors, the observed asymme- tries are marginally compatible with the Standard Model. Improving the experimental accuracy could lead to an indirect signal of new physics.
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