How to define physical properties of unstable particles

被引：21

作者：

Gegelia, J. ^{[1
,2
]}

Scherer, S. ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[2] Tbilisi State Univ, Inst High Energy Phys, Tbilisi, Georgia

来源：

EUROPEAN PHYSICAL JOURNAL A | 2010年 / 44卷 / 03期

关键词：

CHIRAL PERTURBATION-THEORY; MASS; DEFINITION; SCATTERING;

D O I：

10.1140/epja/i2010-10955-5

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

In the framework of effective quantum field theory we address the definition of physical quantities characterizing unstable particles. With the aid of a one-loop calculation, we study this issue in terms of the charge and the magnetic moment of a spin-1/2 resonance. By appealing to the invariance of physical observables under field redefinitions we demonstrate that physical properties of unstable particles should be extracted from the residues at complex (double) poles of the corresponding S-matrix.

引用

页码：425 / 430

页数：6

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