Cross section measurements of e+e−→ωχc0 from s=

Observation of the Y(4220) and Y(4390) in the process Ablikim1, Ачасов2, Adlarson3 et al. 2020Phys. Rev. DSelf Cite342160View full textAdd to dashboardCite

“…It should be noted that we found a resonant structure with a mass around 4220 MeV=c 2 that is significantly higher than the one (4160 MeV=c 2 ) observed by the Belle experiment [28]. A comparison of masses versus widths for the structures in this measurement as well as those obtained from the processes e þ e − → π þ π − J=ψ [12], π þ π − ψð3686Þ [13], π þ π − h c [14], ωχ c0 [15] and π þ D 0 D Ã− [16] by the BESIII experiment are presented in Fig. 3.…”

“…The latest results of the BESIII experiment for e þ e − → π þ π − J=ψ show that the Yð4260Þ may consist of two components, i.e., Yð4220Þ and Yð4320Þ [12]. Dedicated measurements by BESIII of the cross sections for e þ e − → π þ π − ψð3686Þ [13], e þ e − → π þ π − h c [14], ωχ c0 [15] and π þ D 0 D Ã− [16] also support the existence of structures at 4220 MeV=c 2 . A higher mass state, Yð4390Þ, is also observed in the processes e þ e − → π þ π − ψð3686Þ [13] and e þ e − → π þ π − h c [14], which do not match any known vector charmonium or charmoniumlike states.…”

Spectrum of p -wave hidden-charm exotic mesons in the diquark model

“…As discussed in Sec. III, BESIII sees no strong evidence in the J/ψ ππ channel near 4260 MeV of Y (4260) (which interestingly, was historically the first of the Y states observed [46]); rather, their measurement ascribed by the PDG to Y (4260) agrees quite well with the value given for Y (4230), and the latest BESIII value [39] agrees even better. One may then either suppose that all of the other Y (4260) data, obtained via the process e + e − → γY , represent a 4-quark state that is for some reason inaccessible to direct production via e + e − → Y , or it is not an independent 4-quark state at all, being instead an obsolete experimental artifact properly subsumed into Y (4230), or possibly even a signal of the low-lying 1 −− charmonium hybrid expected near that mass [28].…”

“…1. Y (4230), Y (4260), Y (4360), Y (4390) masses are as given in the PDG (Table II) [36,39]. P s QQ =0 values are as given in Case 3.…”

Hadron–Deuteron Correlations and Production of Light Nuclei in Relativistic Heavy-ion Collisions

“…The ψ excitations, up to about 4.5 GeV, have been known from general fits to R data [1,2]. The Y signals have shown in modes such as J/ψπ + π − [3,4], ψ(2S)π + π − [5], h c π + π − [6], and ωχ c0 [7]. To each peak, in each one of these channels, a different Y has been assigned [8].…”