期刊
PHYSICAL REVIEW D
卷 81, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.094028
关键词
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资金
- Helmholtz Association [VH-NG-222, VH-VI-231]
- DFG [SFB/TR 16, 436 RUS 113/991/0-1]
- EU
- RFFI [RFFI-09-02-91342-NNIOa, RFFI-09-02-00629a]
- Presidential programme for support of the leading scientific schools [NSh-4961.2008.2]
- State Corporation of Russian Federation Rosatom''
- Portuguese Foundation for Science and Technology (FCT) [PTDC/FIS/70843/2006-Fisica]
- nonprofit Dynasty foundation
- ICFPM
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.
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