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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.17726 |
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| _version_ | 1866914620152741888 |
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| author | Liang, Xiao Li, Chun-Yuan Shang, Bin-Peng Si, Zong-Guo Wang, Hong-Xin Yang, Xing-Hua Zhang, Dai-Xing |
| author_facet | Liang, Xiao Li, Chun-Yuan Shang, Bin-Peng Si, Zong-Guo Wang, Hong-Xin Yang, Xing-Hua Zhang, Dai-Xing |
| contents | A dark photon is an Abelian gauge boson from a new $U(1)_D$ gauge symmetry, coupled to the Standard Model via kinetic mixing, with $ε$ inducing an effective coupling to the electromagnetic current and $g_χ$ to a stable dark matter particle $χ$. We study $J/ψ$ two-body and four-body decays via a light-mass dark photon ($m_U < 3.0$ GeV) in the framework of non-relativistic QCD (NRQCD), considering both visible and invisible decays of the dark photon into SM fermions or dark sector particles. We investigate the detection sensitivity to the dark photon mass $m_U$ and kinetic mixing parameter $ε$ at both the BESIII and STCF experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_17726 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Searching for dark photons in $J/ψ$ decays Liang, Xiao Li, Chun-Yuan Shang, Bin-Peng Si, Zong-Guo Wang, Hong-Xin Yang, Xing-Hua Zhang, Dai-Xing High Energy Physics - Phenomenology A dark photon is an Abelian gauge boson from a new $U(1)_D$ gauge symmetry, coupled to the Standard Model via kinetic mixing, with $ε$ inducing an effective coupling to the electromagnetic current and $g_χ$ to a stable dark matter particle $χ$. We study $J/ψ$ two-body and four-body decays via a light-mass dark photon ($m_U < 3.0$ GeV) in the framework of non-relativistic QCD (NRQCD), considering both visible and invisible decays of the dark photon into SM fermions or dark sector particles. We investigate the detection sensitivity to the dark photon mass $m_U$ and kinetic mixing parameter $ε$ at both the BESIII and STCF experiments. |
| title | Searching for dark photons in $J/ψ$ decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.17726 |