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  • Open Access

Long-distance contributions to light vector mesons and radiative decays of ηc

Xiao-Yu Qi1, Qi Wu2, and Dian-Yong Chen1,3,*

  • *Contact author: chendy@seu.edu.cn
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Phys. Rev. D 114, 074048 – Published 21 October, 2026

DOI: https://doi.org/10.1103/mp2z-yvm7

Abstract

In the present work, we investigate the long-distance contributions to light hadrons and radiative decays of ηc, where the long-distance contribution is phenomenologically described by the meson loops. Our estimations indicate that the branching fractions of ηc→VV,V=(ρ,ω,ϕ), can be roughly reproduced in the range 1.4<α<1.6, while the parameter range for ηc→γV is determined by the similarity of ηc→γV/VV and χc1→γV/VV. In this parameter range, our estimations indicate that the branching fractions for the processes ηc→γρ0 and ηc→γω are of the order of 10−4, while the one for the process ηc→γϕ is of the order of 10−5. The estimations in the present work are expected to be accessible by future experiments at BESIII and Belle II.

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Phys. Rev. D 114, 074048– Published 21 October, 2026
  • Received 1 August 2026
  • Accepted 30 September 2026
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