Measurement ofe+e−→π+π−

Abstract

We report measurement of the cross section of e þ e − → π þ π − ψð2SÞ between 4.0 and 5.

Production of the charmoniumlike state Y(4220) through the pp¯→Y(<

“…Later, the decay of Y(4230) → ωχ c0 was studied by treating the Y(4230) as ψ(4S ) and the theoretical results are consistent with the experimental data [15]. Furthermore, a revisit study of the e + e − → π + π − ψ(2S ) reaction [11] was done in Ref. [16] In 2017, the BESIII collaboration reported a precise measurement of e + e − → π + π − J/ψ reaction at center-of-mass (c.m.)…”

“…In 2015, the BESIII and Belle collaborations observed a resonance structure around 4.23 GeV with a narrow width in the processes of e + e − → ωχ c0 [10] and e + e − → π + π − ψ(2S ) [11], respectively. Similar results were also found in e + e − → π + π − h c reaction [12,13].…”

Re-examining the X(4630) resonance in the reaction e+e−Dai1, Haidenbauer2, Meißner3 2017Phys. Rev. D421310View full textAdd to dashboardCite

“…This Xð4660Þ [also known as Yð4660Þ] was seen in the reaction e þ e − → π þ π − ψð2SÞ [5][6][7]. Additionally, a structure called the Xð4630Þ was seen in the reaction e þ e − → Λ þ cΛ − c [8] in a very nearby energy region.…”

New results on the XYZ states from Belle experiment

“…The vector charmonium and charmonium-like states are studied via ISR at Belle in the process e + e − → γ ISR π + π − J/ψ [8], e + e − → γ ISR π + π − ψ(2S ) [9], and e + e − → γ ISR K + K − J/ψ [10]. Charged charmonium states decay into a charmonium and a charged pion (or a charged kaon) are searched for in the intermediate states.…”

“…Using the 980 fb −1 full data sample taken with the Belle detector, the analysis of e + e − → π + π − ψ(2S ) is updated with two ψ(2S ) decay modes [9], namely, π + π − J/ψ and μ + μ − .…”