## Amplitude analysis and the nature of the $Z_c$(3900)

The microscopic nature of the XYZ states remains an unsettled topic. We show how a thorough amplitude analysis of the data can help constraining models of these states. Specifically, we consider the case of the $Z_c$(3900) peak and discuss possible scenarios of a QCD state, virtual state, or a kinematical enhancement. We conclude that current data are not precise enough to distinguish between these hypotheses, however, the method we propose, when applied to the forthcoming high-statistics measurements should shed light on the nature of these exotic enhancements.

Publication Date:
Jun 21 2017
Date Submitted:
Aug 10 2018
Pagination:
200-209
ISSN:
1873-2445
Citation:
Phys. Lett.
B772
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