Branching ratios and direct CP asymmetries in D → PP decays

被引：188

作者：

Li, Hsiang-nan ^{[1
,2
,3
]}

Lu, Cai-Dian ^{[4
,5
]}

Yu, Fu-Sheng ^{[4
,5
,6
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 115, Taiwan

[2] Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan

[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[5] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China

[6] Univ Paris 11, Lab Acclrateur Linaire, CNRS, IN2P3,UMR 8607, F-91405 Orsay, France

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 03期

基金：

美国国家科学基金会;

关键词：

QCD FACTORIZATION; MESONS;

D O I：

10.1103/PhysRevD.86.036012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose a theoretical framework for analyzing two-body nonleptonic D meson decays, based on the factorization of short-distance (long-distance) dynamics into Wilson coefficients (hadronic matrix elements of four-fermion operators). The parametrization of hadronic matrix elements in terms of several nonperturbative quantities is demonstrated for the D -> PP decays, P denoting a pseudoscalar meson. We consider the evolution of Wilson coefficients with energy release in individual decay modes, and the Glauber strong phase associated with the pion in nonfactorizable annihilation amplitudes, that is attributed to the unique role of the pion as a Nambu-Goldstone boson and a quark-antiquark bound state simultaneously. The above inputs improve the global fit to the branching ratios involving the eta' meson and resolve the long-standing puzzle from the D-0 -> pi(+) pi(-) and D-0 -> K+ K- branching ratios, respectively. Combining short-distance dynamics associated with penguin operators and the hadronic parameters determined from the global fit to branching ratios, we predict direct CP asymmetries, to which the quark loops and the scalar penguin annihilation give dominant contributions. In particular, we predict Delta A(CP) equivalent to A(CP()K(+) K-) - A(CP) (pi(+) pi(-)) = -1.00 x 10(-3), lower than the LHCb and CDF data.

引用

页数：14

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