NEUTRAL PION-PHOTOPRODUCTION AT THRESHOLD

被引：114

作者：

BERNARD, V

KAISER, N

GASSER, J

MEISSNER, UG

机构：

[1] UNIV STRASBOURG 1, F-67070 STRASBOURG, FRANCE

[2] UNIV BERN, INST THEORET PHYS, CH-3012 BERN, SWITZERLAND

来源：

PHYSICS LETTERS B | 1991年 / 268卷 / 02期

关键词：

D O I：

10.1016/0370-2693(91)90818-B

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We evaluate the neutral pion photoproduction amplitude at threshold to one loop in chiral perturbation theory. Virtual pions generate infrared singularities in the scattering amplitude and modify the familiar low-energy expansion of the electric dipole amplitude E(o+) at next-to-leading order.

引用

页码：291 / 295

页数：5

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