Effects from the charm scale in K+ → π+ ν(ν)over-bar

被引:34
|
作者
Falk, AF
Lewandowski, A
Petrov, AA
机构
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] Cornell Univ, Newman Lab Nucl Studies, Ithaca, NY 14853 USA
基金
美国国家科学基金会; 美国能源部;
关键词
D O I
10.1016/S0370-2693(01)00343-4
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider contributions to the rare decay K+ --> pi (+)nu<(<nu>)over bar> which become nonlocal at the charm scale. Compared to the leading term, such amplitudes are suppressed by powers of m(kappa)(2)/m(c)(2) and could potentially give corrections at the level of 15%. We compute the leading coefficients of the subleading dimension eight operators in the effective theory below the charm mass. The matrix elements of these operators cannot all be calculated from first principles and some must be modeled. We find that these contributions are likely to be small, but the estimate is sufficiently uncertain that the result may be as large as the existing theoretical uncertainty from other sources. (C) 2001 Published by Elsevier science B.V.
引用
收藏
页码:107 / 112
页数:6
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