STABILITY OF THE S-MATRIX POLE

被引：0
|
作者：
RAJASEKARAN, G [1 ]
VASAN, SS [1 ]
机构：
[1] UNIV MADRAS,DEPT THEORET PHYS,MADRAS 600025,TAMIL NADU,INDIA
来源：
PRAMANA-JOURNAL OF PHYSICS | 1990年 / 34卷 / 03期
关键词：
Δ (1232) resonance; 03.80; 11.20; 11.80; Breit-Wigner formula; resonance poles; S matrix; Scattering theory; shadow poles;
D O I：
10.1007/BF02845762
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We show how the position and residue of the S matrix pole can remain stable under changes in the form of the parametrization of the S matrix elements. We also derive a relation among the shifts in the Breit-Wigner resonance parameters under the same changes and verify the relation numerically for the case of Δ(1232). Despite its stability, the pole does not provide a unique definition of the resonance because of the existence of shadow poles. © 1990 the Indian Academy of Sciences.
引用
收藏
页码：183 / 192
页数：10
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