PARTICLES NEAR-THRESHOLD

被引:45
作者
BHATTACHARYA, T
WILLENBROCK, S
机构
[1] Brookhaven National Laboratory, Upton
来源
PHYSICAL REVIEW D | 1993年 / 47卷 / 09期
关键词
D O I
10.1103/PhysRevD.47.4022
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We propose returning to the definition of the width of a particle in terms of the pole in the particle's propagator. Away from thresholds, this definition of width is equivalent to the standard perturbative definition, up to next-to-leading order; however, near a threshold, the two definitions differ significantly. The width as defined by the pole position provides more information in the threshold region than the standard perturbative definition and, in contrast with the perturbative definition, does not vanish when a two-particle s-wave threshold is approached from below.
引用
收藏
页码:4022 / 4027
页数:6
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