Regular Article – Theoretical Physics
On leptonic width of X(4260)
Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, 100871, Beijing, People’s Republic of China
2 Department of Engineering Physics, Tsinghua University, 100084, Beijing, People’s Republic of China
3 Institute of High Energy Physics, 100049, Beijing, People’s Republic of China
4 Collaborative Innovation Center of Quantum Matter, 100871, Beijing, People’s Republic of China
Accepted: 28 December 2020
Published online: 26 January 2021
New measurements on cross sections in , , , , and channels have been carried out by BESIII, Belle and BABAR experiments, as well as in the channel. We perform extensive numerical analyses by combining all these data available, together with those in and channels. Though the latter show no evident peak around GeV, the missing X(4260) is explained as that it is concealed by the interference effects of the well established charmonia , and . Our analyses reveal that the leptonic decay width of X(4260) ranges from eV to keV, and hence it is probably explained in the conventional quark model picture. That is, the X(4260) may well be interpreted as a mixture of and () states.
© The Author(s) 2021
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