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 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.

Amplitude analysis and the nature of the Zc(3900) / Pilloni, Alessandro; Fernandez Ramirez, C.; Jackura, A.; Mathieu, V.; Mikhasenko, M.; Nys, J.; Szczepaniak, A. P.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 772:(2017), pp. 200-209. [10.1016/j.physletb.2017.06.030]

Amplitude analysis and the nature of the Zc(3900)

PILLONI, ALESSANDRO;
2017

Abstract

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 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1002023
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