Nature ofX(4260)

Abstract

We study the property of X(4260) resonance by re-analyzing all experimental data available, especially the e + e − → J/ψ π + π − , ωχc0 cross section data. The final state interactions of the ππ, KK couple channel system are also taken into account. A sizable coupling between the X(4260) and ωχc0 is found. The inclusion of the ωχc0 data indicates a small value of Γ e + e − = 23.30 ± 3.55eV. * 0 molecule [16-18], non-resonant explanation [19,20], etc.. Besides, the tetraquark state explanation is also very intersting [21-26], especially when two resonances, Z c (3900) and Z c (4025), are recently found in J/ψπ and D ( * )D( * ) channels in e + e − annihilation near 4.26GeV by BESIII Collaboration [27], and confirmed by Belle [28] and CLEO [29] Collaborations. However the open charm channels such asDD * , DD * , D * D * are not found in the final states of X(4260) decays [30][31][32], making the property of X(4260) to be more mysterious.The present authors have also studied the X(4260) issue in the previous edition of the present paper (Preprint arXiv:1206.6911v2, herewith denoted as V1). Through a careful analysis to experimental data available, it is found that the X(4260) has a sizable coupling to ωχ c0 channel, but not to other (nearby) channels. Inspired by our result, a recent experimental analysis [33,34] shows that there is indeed a sizable ωχ c0 final state signal in e + e − collision at around 4.26GeV,

Observation ofe+e−→ωχc1,2nearsAblikim1, Ачасов2, Ai3 et al. 2016Phys. Rev. D545260View full textAdd to dashboardCite

“…[20]. As the line shape is incompatible with that of Y (4260) in e + e − → π + π − J/ψ, the authors of Ref.…”

Threshold and Kinematic Effects for the Exotic Resonance-Like Structures

“…[24], χ c0 ω [25], or J/ψKK [26]. The J/ψKK molecule picture is unfavored by the updated experimental measurements in various processes, whileDD 1 (2420) + c.c.…”

The hidden-charm pentaquark and tetraquark states

“…[720], Dai, Shi, Tang, and Zheng studied the property of the Y(4260) resonance by re-analyzing the experimental data till March 2015. They took into account the final state interactions of the ππ and KK couple channels, and found a sizable coupling between the Y(4260) and the ωχ c0 .…”