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Meson loop singularity, exotic states' productions and decays near threshold | | Qian Wang
; Christoph Hanhart
; Qiang Zhao
; | | Date: |
11 Nov 2013 | | 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. | | Source: | arXiv, 1311.2401 | | Services: | Forum | Review | PDF | Favorites | |
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