Search for new light vector boson using J/Ψ at BESIII and Belle II

Kayoung Ban, Yongsoo Jho, Youngjoon Kwon, Seong Chan Park, Seokhee Park, Po Yan Tseng

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6 Citations (Scopus)


We investigate various search strategies for light vector boson X in O(10) MeV mass range using J/Ψ associated channels at BESIII and Belle II: (i) J/Ψ → ηcX with 1010J/Ψs at BESIII, (ii) J/Ψ(ηc + X) + ℓ ℓ ¯ production at Belle II, and (iii) J/Ψ + X with the displaced vertex in X → e+e decay are analyzed and the future sensitivities at Belle II with 50 ab−1 luminosity are comprehensively studied. By requiring the displaced vertex to be within the beam pipe, the third method results in nearly background-free analysis, and the vector boson-electron coupling and the vector boson mass can be probed in the unprecedented range, 10−4 ≤ |εe| ≤ 10−3 and 9 MeV ≤ mX ≤ 100MeV with 50 ab−1 at Belle II. This covers the favored signal region of 8Be* anomaly recently reported by Atomki experiment with mX ≃ 17 MeV.

Original languageEnglish
Article number91
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 2021 Apr

Bibliographical note

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© 2021, The Author(s).

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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