Direct CP violation in two-body hadronic charmed meson decays

被引：105

作者：

Cheng, Hai-Yang ^{[1
]}

Chiang, Cheng-Wei ^{[1
,2
,3
,4
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[2] Natl Cent Univ, Dept Phys, Chungli 32001, Taiwan

[3] Natl Cent Univ, Ctr Math & Theoret Phys, Chungli 32001, Taiwan

[4] Natl Ctr Theoret Sci, Div Phys, Hsinchu 30013, Taiwan

来源：

PHYSICAL REVIEW D | 2012年 / 85卷 / 03期

关键词：

QCD FACTORIZATION; STRONG PHASES; PI; RATES;

D O I：

10.1103/PhysRevD.85.034036

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Motivated by the recent observation of CP violation in the charm sector by LHCb, we study direct CP asymmetries in the standard model (SM) for the singly Cabibbo-suppressed two-body hadronic decays of charmed mesons using the topological-diagram approach. In this approach, the magnitude and the phase of topological weak annihilation amplitudes, which arise mainly from final-state rescattering, can be extracted from the data. Consequently, direct CP asymmetry a(dir)((tree)) at tree level can be reliably estimated. In general, it lies in the range 10(-4) < a(dir)((tree)) < 10(-3). Short-distance QCD penguins and penguin annihilation are calculated using QCD factorization. Their effects are generally small, especially for D -> VP modes. Since weak penguin annihilation receives long-distance contributions from the color-allowed tree amplitude followed by final-state rescattering, it is expected to give the dominant contribution to the direct CP violation in the decays D-0 -> K+K- and D-0 -> pi(+)pi(-), in which a(dir)((tree)) is absent. The maximal Delta a(CP)(dir), the direct CP asymmetry difference between the above-mentioned two modes, allowed in the SM is around -0.25%, more than 2 sigma away from the current world average of -(0.645 +/- 0.180)%.

引用

页数：12

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