Amplitude analysis and the nature of the Z(3900)

• Published in: Physics letters. B Vol. 772; no. C; pp. 200 - 209
• Main Authors: Pilloni, A., Fernández-Ramírez, C., Jackura, A., Mathieu, V., Mikhasenko, M., Nys, J., Szczepaniak, A.P.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier 01.09.2017
• Subjects: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2017.06.030

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 Zc(3900) peak and discuss possible scenarios of a QCD state, virtual state, or a kinematical enhancement. Here, 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.