ON THE LOW-ENERGY THEOREMS FOR THRESHOLD PION ELECTROPRODUCTION

被引：25

作者：

BERNARD, V

KAISER, N

MEISSNER, UG

机构：

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

[2] TECH UNIV MUNICH, PHYS DEPT T30, W-8046 GARCHING, GERMANY

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

来源：

PHYSICS LETTERS B | 1992年 / 282卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(92)90667-S

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider pion electroproduction at threshold to one loop order in chiral perturbation theory. We derive novel contributions to the low-energy theorems for the S-wave multipoles E0+ and L0+ at threshold to order O(m-2, upsilon), with mu=M(pi)/m the ratio of the pion and nucleon mass and upsilon=k2/m2 related to the four-momentum of the virtual photon. At next-to-leading order, the effect of infrared singularities generated by virtual pions becomes visible. We also discuss the inclusion of photon-nucleon vertex form factors.

引用

页码：448 / 452

页数：5

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