Abstract
We investigate various search strategies for light vector boson X in \( \mathcal{O} \)(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) + \( \mathrm{\ell}\overline{\mathrm{\ell}} \) 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.
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Ban, K., Jho, Y., Kwon, Y. et al. Search for new light vector boson using J/Ψ at BESIII and Belle II. J. High Energ. Phys. 2021, 91 (2021). https://doi.org/10.1007/JHEP04(2021)091
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DOI: https://doi.org/10.1007/JHEP04(2021)091