$J/ψ$ Polarization and $p_T$ distribution in $c\ \!\bar{c}$ associated hadroproduction at $\mathcal{O}(α_s^5)$
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| Format: | Preprint |
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2025
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| _version_ | 1866916867199729664 |
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| author | Feng, Qi-Ming Qiao, Cong-Feng |
| author_facet | Feng, Qi-Ming Qiao, Cong-Feng |
| contents | The quarkonium production in association with a heavy-quark pair of the same flavor was found plays an important role in various production schemes, let alone it provides a distinctive signature that could be studied in experiment. Within the NRQCD framework, we perform the first complete calculation of the hadroproduction process $gg\to J/ψ+c\bar{c}$ at the next-to-leading order (NLO) in the expansion of strong coupling constant $α_s$. The result tells that the NLO corrections substantially enhance the color-singlet yield and alter the predicted polarization patterns, and hence lead to a better agreement with experimental data across the $p_T$ spectrum. In contrast to charm-quark fragmentation, the $J/ψ$ and $c\bar{c}$ associated production channel displays a markedly different kinematic behavior, underscoring its distinct role in the production mechanism. While the inclusion of this process greatly reduces the discrepancy between color-singlet theoretical prediction and experimental measurement, a residual gap of approximately one order of magnitude still remains. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_20654 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $J/ψ$ Polarization and $p_T$ distribution in $c\ \!\bar{c}$ associated hadroproduction at $\mathcal{O}(α_s^5)$ Feng, Qi-Ming Qiao, Cong-Feng High Energy Physics - Phenomenology The quarkonium production in association with a heavy-quark pair of the same flavor was found plays an important role in various production schemes, let alone it provides a distinctive signature that could be studied in experiment. Within the NRQCD framework, we perform the first complete calculation of the hadroproduction process $gg\to J/ψ+c\bar{c}$ at the next-to-leading order (NLO) in the expansion of strong coupling constant $α_s$. The result tells that the NLO corrections substantially enhance the color-singlet yield and alter the predicted polarization patterns, and hence lead to a better agreement with experimental data across the $p_T$ spectrum. In contrast to charm-quark fragmentation, the $J/ψ$ and $c\bar{c}$ associated production channel displays a markedly different kinematic behavior, underscoring its distinct role in the production mechanism. While the inclusion of this process greatly reduces the discrepancy between color-singlet theoretical prediction and experimental measurement, a residual gap of approximately one order of magnitude still remains. |
| title | $J/ψ$ Polarization and $p_T$ distribution in $c\ \!\bar{c}$ associated hadroproduction at $\mathcal{O}(α_s^5)$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.20654 |