Meson loop singularity, exotic states' productions and decays near threshold

Qian Wang; Christoph Hanhart; Qiang Zhao

Meson loop singularity, exotic states' productions and decays near threshold

High Energy Physics - Phenomenology 2013-11-12 v1

Authors: Qian Wang , Christoph Hanhart , Qiang Zhao

Abstract

We investigate in detail the "triangle singularity" regions of meson loops where the corresponding intermediate mesons are nearly-on-shell and have relatively small momenta, and the two heavy mesons strongly interact with each other in an $S$ wave. This $S$ -wave interaction will make such kind of meson loops always enhanced and can explain experimental observations of threshold enhancements. We show that the production of the $Y(4260)$ and the recently observed $Z_c(3900)$ can be related to each other by this mechanism which will allow for a possible understanding of the nature of these threshold enhancements.

Keywords

triangle singularity meson loops exotic states threshold enhancements Y(4260) Z_c(3900) S-wave interaction

Cite

@article{arxiv.1311.2401,
  title  = {Meson loop singularity, exotic states' productions and decays near threshold},
  author = {Qian Wang and Christoph Hanhart and Qiang Zhao},
  journal= {arXiv preprint arXiv:1311.2401},
  year   = {2013}
}

Comments

to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013)

Meson loop singularity, exotic states' productions and decays near threshold

Abstract

Keywords

Cite

Comments

Related papers