Exclusive radiative decays of Υ in soft-collinear effective theory -: art. no. 074002

被引：20

作者：

Fleming, S ^{[1
]}

Lee, C

Leibovich, AK

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] CALTECH, Pasadena, CA 91125 USA

[3] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

来源：

PHYSICAL REVIEW D | 2005年 / 71卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.71.074002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study exclusive radiative decays of the Upsilon using soft-collinear effective theory and nonrelativistic QCD. In contrast to inclusive radiative decays at the endpoint we find that color-octet contributions are power suppressed in exclusive decays, and can safely be neglected, greatly simplifying the analysis. We determine the complete set of Lorentz structures that can appear in the SCET Wilson coefficients and match onto them using results from a previous calculation. We run these coefficients from the scale M-Upsilon to the scale Lambda similar to 1 GeV, thereby summing large logarithms. Finally we use our results to predict the ratio of branching fractions B(Upsilon ->gamma f(2))/B(J/psi ->gamma f(2)), B(J/psi'->gamma f(2))/B(psi (')->gamma f(2)), and the partial rate for Upsilon ->gamma pi pi.

引用

页码：1 / 10

页数：10

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