Employing spin symmetry to disentangle different models for the $XYZ$ states

Employing spin symmetry to disentangle different models for the $X Y Z$ states

Martin Cleven, Feng-Kun Guo, Christoph Hanhart, Qian Wang, and Qiang Zhao

Phys. Rev. D 92, 014005 – Published 7 July 2015

Abstract

In order to test different models proposed for some states discovered recently in the charmonium mass range that do not fit into the pattern predicted by the conventional quark model, we derive predictions for the spectrum within the hadro-charmonium picture, the tetraquark picture as well as the hadronic molecular approach. We exploit heavy quark spin symmetry for the hadro-charmonium and hadronic molecule scenarios. The patterns that emerge from the different models turn out to be quite distinct. For example, only within the hadro-charmonium picture a pseudoscalar state emerges that is lighter than the $Y (4260)$ . Possible discovery channels of these additional states are discussed.

Received 13 May 2015

DOI:https://doi.org/10.1103/PhysRevD.92.014005

Authors & Affiliations

Martin Cleven^1,*, Feng-Kun Guo^2,†, Christoph Hanhart^3,‡, Qian Wang^3,§, and Qiang Zhao^1,¶

¹Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China
²Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany
³Institut für Kernphysik and Institute for Advanced Simulation, Forschungszentrum Jülich, D–52425 Jülich, Germany

^*cleven@ihep.ac.cn
^†fkguo@hiskp.uni-bonn.de
^‡c.hanhart@fz-juelich.de
^§q.wang@fz-juelich.de
^¶zhaoq@ihep.ac.cn

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Vol. 92, Iss. 1 — 1 July 2015

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Physical Review D

covering particles, fields, gravitation, and cosmology