Lineshapes for composite particles with unstable constituents
High Energy Physics - Phenomenology
2014-11-20 v2 High Energy Physics - Experiment
Abstract
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 formulae, already existing in the literature, emerge for narrow constituents and identify the parameter that controls the regime of their applicability.
Keywords
Cite
@article{arxiv.1002.4097,
title = {Lineshapes for composite particles with unstable constituents},
author = {C. Hanhart and Yu. S. Kalashnikova and A. V. Nefediev},
journal= {arXiv preprint arXiv:1002.4097},
year = {2014}
}
Comments
RevTeX4, 27 pages, short discussions added, typos corrected, references updated, to appear in Phys.Rev.D