https://doi.org/10.1140/epjc/s10052-020-08813-y
Regular Article – Theoretical Physics
On leptonic width of X(4260)
1
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
Received:
28
October
2020
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
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3
