Leading power SCET analysis of e+e- → J/ψgg

被引：15
作者：
Lin, ZH [1 ]
Zhu, GH
机构：
[1] KEK, Theory Grp, Tsukuba, Ibaraki 3050801, Japan
[2] Ecole Polytech, UMR 7644, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France
来源：
PHYSICS LETTERS B | 2004年 / 597卷 / 3-4期
基金：
日本学术振兴会;
关键词：
D O I：
10.1016/j.physletb.2004.07.037
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recently, Belle and BaBar Collaborations observed surprising suppression in the endpoint J/Psi spectrum, which stimulates us to examine the endpoint behaviors of the e(+)e(-) --> J/Psigg production. We calculate the J/Psi momentum and angular distributions for this process within the framework of the soft-collinear effective theory (SCET). The decreasing spectrum in the endpoint region is obtained by summing the Sudakov logarithms. We also find a large discrepancy between the NRQCD and SCET spectrum in the endpoint region even before the large logarithms are summed, which is probably due to the fact that only the scalar structure of the two-gluon system is picked out in the leading power expansion. A comparison with the process gamma --> gammagg is made. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：382 / 390
页数：9
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