PreprintCC BY 4.0arXiv
Long-Distance Contributions to Light Vector Mesons and Radiative Decays of ηc
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 order 10−4, while the one for the process ηc → γϕ is of order 10−5. The estimations in the present work are expected to be accessible by future experiments at BESIII and Belle II.
Related
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BibTeX
@misc{qi2026longdistance,
title = {{Long-Distance Contributions to Light Vector Mesons and Radiative Decays of $η_c$}},
author = {Xiao-Yu Qi and Qi Wu and Dian-Yong Chen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13837},
eprint = {2610.13837},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13837},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Long-Distance Contributions to Light Vector Mesons and Radiative Decays of η_c
AU - Xiao-Yu Qi
AU - Qi Wu
AU - Dian-Yong Chen
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.13837
UR - https://arxiv.org/abs/2610.13837
AB - In the present work, we investigate the long-distance contributions to light hadrons and radiative decays of η_c, where the long-distance contribution is phenomenologically described by the meson loops. Our estimations indicate that the branching fractions of η_c → 𝒱𝒱, 𝒱=(ρ,ω, ϕ) can be roughly reproduced in the range 1.4<α<1.6. While the parameter range for η_c → γ𝒱 is determined by the similarity of η_c → γ𝒱/𝒱𝒱 and χ_c1 → γ𝒱/𝒱𝒱. In this parameter range, our estimations indicate that the branching fractions for the processes η_c → γρ^0 and η_c → γω are of order 10^−4, while the one for the process η_c → γϕ is of order 10^−5. The estimations in the present work are expected to be accessible by future experiments at BESIII and Belle II.
ER -