• Open Access

Study of the Dalitz decay J/ψe+eη

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. D 99, 012006 – Published 9 January 2019; Erratum Phys. Rev. D 104, 099901 (2021)

Abstract

We study the electromagnetic Dalitz decay J/ψe+eη and search for dielectron decays of a dark gauge boson (γ) in J/ψγη with the two η decay modes ηγγ and ηπ+ππ0 using (1310.6±7.0)×106J/ψ events collected with the BESIII detector. The branching fraction of J/ψe+eη is measured to be (1.43±0.04(stat)±0.06(syst))×105, with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Λ=2.84±0.11(stat)±0.08(syst)GeV/c2. We find no evidence of γ production and set 90% confidence level upper limits on the product branching fraction B(J/ψγη)×B(γe+e) as well as the kinetic mixing strength between the standard model photon and γ in the mass range of 0.01mγ2.4GeV/c2.

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  • Received 8 October 2018

DOI:https://doi.org/10.1103/PhysRevD.99.012006

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

Physics Subject Headings (PhySH)

Particles & Fields

Erratum

Erratum: Study of the Dalitz decay J/ψe+eη [Phys. Rev. D 99, 012006 (2019)]

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. D 104, 099901 (2021)

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Vol. 99, Iss. 1 — 1 January 2019

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