Study of the resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ process

Abstract

Using about 23 $\mathrm{f}{\mathrm{b}}^{-1}$ of data collected with the BESIII detector operating at the BEPCII storage ring, a precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ Born cross section is performed at center-of-mass energies from 3.7730 to 4.7008 GeV. Two structures, identified as the $Y(4220)$ and the $Y(4320)$ states, are observed in the energy-dependent cross section with a significance larger than $10\sigma$. The masses and widths of the two structures are determined to be ($M,\Gamma$) = ($4221.4\pm 1.5\pm 2.0$ MeV/$c^2$, $41.8\pm 2.9\pm 2.7$ MeV) and ($M,\Gamma$) = ($4298\pm 12\pm 26$ MeV/$c^2$, $127\pm 17\pm 10$ MeV), respectively. A small enhancement around 4.5 GeV with a significance about $3\sigma$, compatible with the $\psi (4415)$, might also indicate the presence of an additional resonance in the spectrum. The inclusion of this additional contribution in the fit to the cross section affects the resonance parameters of the $Y(4320)$ state.

References in corpus (8)

• Measurement of e^+e^- to pi^+pi^-J/psi Cross Section via Initial State Radiation at Belle
• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
• Evidence of Two Resonant Structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Study of $e^{+}{e}^{-}\to \omega {\chi }_{cJ}$ at center-of-mass energies from 4.21 to 4.42 GeV
• Determination of spin and parity of the $Z_c(3900)$
• Determining the upper limit of Gamma_{ee} for the Y(4260)
• Three-nucleon force at large distances: Insights from chiral effective field theory and the large-N_c expansion
• The Spectrum of $P$-Wave Hidden-Charm Exotic Mesons in the Diquark Model

Cited by in corpus (10)

• Observation of Three Charmoniumlike States with $J^{PC}=1^{--}$ in $e^{+}{e}^{-}\to D^{\ast 0}{D}^{\ast -}{\pi }^{+}$
• Observation of a vector charmoniumlike state at 4.7 $\mathrm{GeV}/c^2$ and search for $Z_{cs}$ in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• Global coupled-channel analysis of $e^{+}{e}^{-}\to c\bar{c}$ processes in $\sqrt{s}=3.75-4.7$ GeV
• Measurement of $e^{+}{e}^{-}\to \eta J/\psi$ Cross Section from $\sqrt{s}=$ 3.808 GeV to 4.951 GeV
• How does the $X(3872)$ show up in $e^{+}{e}^{-}$ collisions: dip versus peak
• Observation of Three Resonant Structures in the Cross Section of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Partial Wave Analysis of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Cross Section Measurement of $e^{+}{e}^{-}\to {\pi }^{\pm }{Z}_c(3900{)}^{\mp }$ from 4.1271 to 4.3583 GeV
• Hadronic molecules and multiquark states
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II
• Pinpointing Physical Solutions in Y(4230) Decays