Improved determination of the electroweak penguin contribution to ε′/ε in the chiral limit

被引：61

作者：

Cirigliano, V

Donoghue, JF

Golowich, E

Maltman, K

机构：

[1] Univ Valencia, CSIC, IFIC, Dept Fis Teor, E-46071 Valencia, Spain

[2] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[3] York Univ, Dept Math & Stat, Toronto, ON M3J 1P3, Canada

[4] Univ Adelaide, CSSN, Adelaide, SA 5005, Australia

来源：

PHYSICS LETTERS B | 2003年 / 555卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(03)00010-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We perform a finite energy sum rule analysis of the flavor ud two-point V-A current correlator, DeltaPi(Q(2)). The analysis, which is performed using both the ALEPH and OPAL databases for the V-A spectral function, Deltarho, allows us to extract the dimension six V-A OPE coefficient, a(6), which is related to the matrix element of the electroweak penguin operator, Q(8), by chiral symmetry. The result for a(6) leads directly to the improved (chiral limit) determination is an element of'/is an element of = (-15.0 +/- 2.7) x 10(-4). Determination of higher dimension OPE contributions also allows us to perform an independent test using a low-scale constrained dispersive analysis, which provides a highly nontrivial consistency check of the results. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：71 / 82

页数：12

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