Lineshapes for composite particles with unstable constituents

被引：68

作者：

Hanhart, C. ^{[1
,2
]}

Kalashnikova, Yu. S. ^{[3
]}

Nefediev, A. V. ^{[3
]}

机构：

[1] Forschungszentrum Julich, Inst Kernphys IKP 3, D-52425 Julich, Germany

[2] Julich Ctr Hadron Phys, Inst Adv Simulat IAS 4, D-52425 Julich, Germany

[3] Inst Theoret & Expt Phys, Moscow 117218, Russia

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.81.094028

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss on very general grounds possible lineshapes of composite particles with one unstable constituent. Expressions are derived in a coupled-channel formalism for constituents interacting in an S-wave with no assumption made on the width of one of them. We show how easy-to-use formulas, already existing in the literature, emerge for narrow constituents and identify the parameter that controls the regime of their applicability.

引用

页数：15

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