Abstract
We search for the process $e^{+}e^{-}\rightarrow \pi ^{+}\pi ^{-} \chi_{cJ}$ ($J=0,1,2$) and for a charged charmonium-like state in the $\pi ^{\pm} \chi_{cJ}$ subsystem. The search uses data sets collected with the BESIII detector at the BEPCII storage ring at center-of-mass energies between 4.18 GeV and 4.60 GeV. No significant $\pi ^{+}\pi ^{-} \chi_{cJ}$ signals are observed at any center-of-mass energy, and thus upper limits are provided which also serve as limits for a possible charmonium-like structure in the invariant $\pi ^{\pm} \chi_{cJ}$ mass.
Highlights
In the past decade, the discovery of new and exotic resonances has opened up exciting possibilities for further study of quantum chromodynamics in the charmonium and bottomonium energy regions [1,2,3]
One important resonance is the Yð4260Þ, which was observed by the BABAR collaboration in the initial state radiation (ISR) process eþe− → γISRJ=ψπþπ− [4,5] and was confirmed by several other collaborations, such as CLEO [6], Belle [7,8] and BESIII [9]
The corresponding electromagnetic calorimeter (EMC) time is required to be within a window of 700 ns relative to the event start time, and the candidates are requested to be at least 20° away from the nearest charged track to reject EMC hits caused by split-offs of clusters of charged particles
Summary
The discovery of new and exotic resonances has opened up exciting possibilities for further study of quantum chromodynamics in the charmonium and bottomonium energy regions [1,2,3]. Despite lying above several open-charm thresholds (starting at 3.73 GeV=c2), the Yð4260Þ state, with quantum number JPC 1⁄4 1−−, unconventionally couples much more strongly to the final state J=ψπþπ− [10] rather than to open-charm final states. In 2008, the Belle collaboration, studying the decay B 0 → K−πþχc, observed two charged charmoniumlike structures in the χc1πÆ subsystem with a statistical significance of 5σ. These structures were denoted as the Zcð4050ÞÆ and the Zcð4250ÞÆ, with masses of 4051 Æ 14þ−4210 MeV=c2 and 4248−þ2494−þ31580 MeV=c2, respectively, and corresponding widths of 82−þ1271−þ2427 and 177−þ3594−þ63116 MeV [11]. Due to phase-space restrictions, the production of the second state Zcð4250ÞÆ is only possible at higher energies
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
