• Open Access

Measurement of e+eγχc0,c1,c2 cross sections at center-of-mass energies between 3.77 and 4.60 GeV

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. D 104, 092001 – Published 1 November 2021

Abstract

The e+eγχcJ (J=0, 1, 2) processes are studied at center-of-mass energies ranging from 3.773 to 4.600 GeV, using a total integrated luminosity of 19.3fb1 e+e annihilation data accumulated with the BESIII detector at BEPCII. We observe for the first time e+eγχc1,c2 signals at s=4.180GeV with statistical significances of 7.6σ and 6.0σ, respectively. The production cross section of e+eγχc1,c2 at each center-of-mass energy is also measured. We find that the line shape of the e+eγχc1 cross section can be described with conventional charmonium states ψ(3686), ψ(3770), ψ(4040), ψ(4160). Compared with this, for the e+eγχc2 channel, one more additional resonance is added to describe the cross section line shape. Its mass and width are measured to be M=4371.7±7.5±1.8MeV/c2 and Γtot=51.1±17.6±1.9MeV, where the first uncertainties are statistical and the second systematic. The significance of this resonance is estimated to be 5.8σ, and its parameters agree with the Y(4360) resonance previously reported in e+eπ+πψ(3686), and the Y(4390) in e+eπ+πhc within uncertainties. No significant signal for the e+eγχc0 process is observed, and the upper limits of Born cross sections σB(e+eγχc0) at 90% confidence level are reported.

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  • Received 6 July 2021
  • Accepted 13 September 2021

DOI:https://doi.org/10.1103/PhysRevD.104.092001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

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Vol. 104, Iss. 9 — 1 November 2021

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