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γ and J/ψ production through the initial state radiation process in electron-positron annihilation at B factories

Shashank Bhatnagar

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Phys. Rev. D 112, 054011 – Published 8 September, 2025

DOI: https://doi.org/10.1103/s6wr-68tg

Abstract

We study the initial state radiation (ISR) process, e−e+→*γ→γ+J/ψ observed at high luminosity e−e+ colliders such as B factories, with the ISR photon being emitted through the initial electron or positron, prior to their annihilation. The emitted J/Ψ is produced through the photon fragmentation process, with the produced J/ψ in turn decaying into a pair of leptons, μ−+μ+ through the leptonic decay process, J/Ψ→γ*→γμ−μ+. The cross section for the J/Ψ production, and the branching ratio for the leptonic decay of J/Ψ→μ−μ+, both calculated in the framework of Bethe-Salpeter equation are used to work out the cross section for the complete process, e−e+→γ+J/ψ→γ+μ−+μ+. Our results are compared with the BABAR data, and other models. This study is then extended to production and decays of ϒ(1S) through the ISR process.

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Phys. Rev. D 112, 054011– Published 8 September, 2025
  • Received 1 March 2025
  • Accepted 4 August 2025
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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.

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