Eur. Phys. J. C (2018) 78: 605
https://doi.org/10.1140/epjc/s10052-018-6087-3

Regular Article - Theoretical Physics

A new decay mode of higher charmonium

¹ School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
² Center of High Energy Physics, Peking University, Beijing, 100871, China
³ Department of Physics, Hunan Normal University, and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Changsha, 410081, China
⁴ Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha, 410081, China
⁵ Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China

^* e-mail: lyxiao@pku.edu.cn

Received: 30 May 2018
Accepted: 18 July 2018
Published online: 28 July 2018

Abstract

We calculate the partial decay width of the excited vector charmonium states around 4.6 GeV with the quark pair creation model. We find that the partial decay width of the mode can reach up to several MeV for . In contrast, the partial decay width of the states is less than one MeV. If the enhancement Y(4630) reported by the Belle Collaboration in invariant-mass distribution is the same structure as Y(4660), the Y(4660) resonance is most likely to be a S-wave charmonium state.