Electromagnetic corrections to γπ±→π0π± -: art. no. 094009

被引：0
|
作者：
Ametller, L [1 ]
Knecht, M
Talavera, P
机构：
[1] UPC, Dept Fis & Engn Nucl, E-08034 Barcelona, Spain
[2] CNRS Marseille Luminy, Ctr Phys Theor, F-13288 Marseille 9, France
来源：
PHYSICAL REVIEW D | 2001年 / 64卷 / 09期
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The amplitude for the anomalous transitions gamma pi (+/-) --> pi (o)pi (+/-) is analyzed within chiral perturbation theory including electromagnetic interactions. The presence of a t-channel one-photon exchange contribution induces sizable O(e(2)) corrections which enhance the cross section in the threshold region and bring the theoretical prediction into agreement with available data. In the case of the crossed reaction gamma pi (o) --> pi (+)pi (-), the same contribution appears in the s channel and its effects are small.
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