On leptonic width of X(4260)

• Published in: The European physical journal. C, Particles and fields Vol. 81; no. 1; pp. 1 - 10
• Main Authors: Cao, Qin-Fang, Qi, Hong-Rong, Tang, Guang-Yi, Xue, Yun-Feng, Zheng, Han-Qing
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2021; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Channels; Elementary Particles; Hadrons; Heavy Ions; Leptons; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Numerical analysis; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quark models; Quarks; Regular Article – Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-020-08813-y

New measurements on cross sections in e + e - → J / ψ π + π - , h c π + π - , D 0 D ∗ - π + + c . c . , ψ ( 2 S ) π + π - , ω χ c 0 and J / ψ η channels have been carried out by BESIII, Belle and BABAR experiments, as well as in the D s ∗ + D s ∗ - channel. We perform extensive numerical analyses by combining all these data available, together with those in D + D ∗ - + c . c . and D ∗ + D ∗ - channels. Though the latter show no evident peak around s = 4.230 GeV, the missing X (4260) is explained as that it is concealed by the interference effects of the well established charmonia ψ ( 4040 ) , ψ ( 4160 ) and ψ ( 4415 ) . Our analyses reveal that the leptonic decay width of X (4260) ranges from O ( 10 2 ) eV to O ( 1 ) 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 4 3 S 1 and 3 3 D 1 ( 2 3 D 1 ) states.