WEAK RADIATIVE HYPERON DECAYS IN CHIRAL PERTURBATION-THEORY

被引：24

作者：

JENKINS, E ^{[1
]}

LUKE, M ^{[1
]}

MANOHAR, AV ^{[1
]}

SAVAGE, MJ ^{[1
]}

机构：

[1] UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093

来源：

NUCLEAR PHYSICS B | 1993年 / 397卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0550-3213(93)90336-N

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The Parity-conserving a and parity-violating b amplitudes for weak radiative hyperon decay are studied using chiral perturbation theory. The imaginary parts of a and b are computed using unitarity. The real part of b is dominated by a one-loop infrared divergent graph which is computed. The real part of a has a large theoretical uncertainty and cannot be calculated reliably. Counterterms for the a and b amplitudes are classified using CPS symmetry. The experimental values for decay widths and asymmetries are consistent with theory, with the exception of the asymmetry parameter for the SIGMA+ --> pgamma decay.

引用

页码：84 / 104

页数：21

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