X(3915) as a tensor D^∗D^¯∗ molecule

¹ Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany
² Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia
³ Forschungszentrum Jülich, Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, D-52425 Jülich, Germany
⁴ National Research Nuclear University MEPhI, 115409, Kashirskoe highway 31, Moscow, Russia
⁵ Moscow Institute of Physics and Technology, 141700 Institutsky lane 9, Dolgoprudny, Moscow Region, Russia

^* e-mail: vadimb@tp2.rub.de
^** e-mail: c.hanhart@fz-juelich.de
^*** e-mail: nefediev@itep.ru

Published online: 18 October 2019

Abstract

Two-photon decays of a tensor D^∗D¯^∗ molecule are studied and the suggested approach is applied to the X(3915) charmonium-like state under the assumption of the latter being a 2⁺⁺ molecule — a spin partner of the X(3872). It is argued that the existing experimental data disfavour such an identification of this state. Therefore, it is suggested that either the X(3915) has a different exotic nature or it has to be identified as a scalar.