Nonspectator effects and B meson lifetimes from a field-theoretic calculation -: art. no. 014011.

被引：22

作者：

Cheng, HY ^{[1
]}

Yang, KC ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW D | 1999年 / 59卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.59.014011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The B meson lifetime ratios are calculated to the order of 1/m(b)(3) in heavy quark expansion. The predictions of those ratios an dependent on four unknown hadronic parameters B-1, B-2, epsilon(1), and epsilon(2) where B-1 and B-2 parametrize the matrix elements of color singlet-singlet four-quark operators and epsilon(1) and epsilon(2) the matrix elements of color octet-octet operators. We derive the renormalization-group improved QCD sum rules for these parameters within the framework of heavy quark effective theory. The results are B-1(m(b)) = 0.96 +/- 0.04, B-2(m(b)) = 0.95 +/- 0.02, epsilon(1)(m(b))= -0.14 +/- 0.01, and epsilon(2)(m(b)) = -0.08 +/- 0.01 to zeroth order in 1/m(b). The resultant B meson lifetime ratios are tau(B-)/tau(B-d) = 1.11 +/- 0.02 and tau(B-s)/tau(B-d) approximate to 1 in SU(3) symmetry limit. [S0556-2821(98)05223-0].

引用

页数：11

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