Next-to-leading order analysis of $J/ψ+ γ$ production in photon-photon collisions at CEPC
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866910032324460544 |
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| author | Jiang, Ying-Zhao Sun, Zhan |
| author_facet | Jiang, Ying-Zhao Sun, Zhan |
| contents | We systematically investigate the production of $J/ψ+ γ$ in $γγ$ collisions within nonrelativistic QCD (NRQCD) factorization, with the direct-photon channel calculated specifically up to the next-to-leading order in $α_s$. Calculations for CEPC energy region show the resolved photon contribution is negligible, while the direct photon process dominates, yielding substantial annual $J/ψ$ yields. Significant modifications to $J/ψ$ polarization parameters emerge from color-octet mechanisms, and different NRQCD long distance matrix elements (LDMEs) further yield distinct polarization patterns. Furthermore, the polarization predictions are highly sensitive to the $^3P_J^{[8]}$ LDME, while being insensitive to the $^1S_0^{[8]}$ and $^3S_1^{[8]}$ LDMEs. Leveraging the cleaner environment of $e^+e^-$ collisions versus hadronic processes, the production of $J/ψ$ associated with a photon in $γγ$ collisions provides a high-precision platform to test LDMEs universality and resolve longstanding $J/ψ$ polarization puzzles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_16881 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Next-to-leading order analysis of $J/ψ+ γ$ production in photon-photon collisions at CEPC Jiang, Ying-Zhao Sun, Zhan High Energy Physics - Phenomenology We systematically investigate the production of $J/ψ+ γ$ in $γγ$ collisions within nonrelativistic QCD (NRQCD) factorization, with the direct-photon channel calculated specifically up to the next-to-leading order in $α_s$. Calculations for CEPC energy region show the resolved photon contribution is negligible, while the direct photon process dominates, yielding substantial annual $J/ψ$ yields. Significant modifications to $J/ψ$ polarization parameters emerge from color-octet mechanisms, and different NRQCD long distance matrix elements (LDMEs) further yield distinct polarization patterns. Furthermore, the polarization predictions are highly sensitive to the $^3P_J^{[8]}$ LDME, while being insensitive to the $^1S_0^{[8]}$ and $^3S_1^{[8]}$ LDMEs. Leveraging the cleaner environment of $e^+e^-$ collisions versus hadronic processes, the production of $J/ψ$ associated with a photon in $γγ$ collisions provides a high-precision platform to test LDMEs universality and resolve longstanding $J/ψ$ polarization puzzles. |
| title | Next-to-leading order analysis of $J/ψ+ γ$ production in photon-photon collisions at CEPC |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.16881 |