• Open Access

Study of e+eγωJ/ψ and Observation of X(3872)ωJ/ψ

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 122, 232002 – Published 14 June 2019
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Abstract

We study the e+eγωJ/ψ process using 11.6fb1 e+e annihilation data taken at center-of-mass energies from s=4.008GeV to 4.600 GeV with the BESIII detector at the BEPCII storage ring. The X(3872) resonance is observed for the first time in the ωJ/ψ system with a significance of more than 5σ. The relative decay ratio of X(3872)ωJ/ψ and π+πJ/ψ is measured to be R=1.60.3+0.4±0.2, where the first uncertainty is statistical and the second systematic (the same hereafter). The s-dependent cross section of e+eγX(3872) is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the Y(4200), with a mass of 4200.613.3+7.9±3.0MeV/c2 and a width of 11526+38±12MeV. In addition, to describe the ωJ/ψ mass distribution above 3.9GeV/c2, we need at least one additional Breit-Wigner resonance, labeled as X(3915), in the fit. The mass and width of the X(3915) are determined. The resonant parameters of the X(3915) agree with those of the Y(3940) in BKωJ/ψ and of the X(3915) in γγωJ/ψ observed by the Belle and BABAR experiments within errors.

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  • Received 11 March 2019
  • Revised 25 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.232002

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. 122, Iss. 23 — 14 June 2019

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