Gluon shadowing in nuclei and the role of the $c \bar c g$ state in the coherent photoproduction of $J/ψ$ in nucleus-nucleus collisions
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913391852912640 |
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| author | Łuszczak, Agnieszka Schäfer, Wolfgang |
| author_facet | Łuszczak, Agnieszka Schäfer, Wolfgang |
| contents | In this brief note, we confront our results on diffractive photoproduction of $J/ψ$ mesons with the putative gluon shadowing ratio defined as $R_g= \sqrt{σ(γA \to J/ψA)/σ_{\rm IA.}}$, where $σ_{\rm IA}$ is the result in impulse approximation. Building on our earlier description of the process in the color-dipole approach, where we took into account the rescattering of $c \bar c$ states only, we demonstrate that the inclusion of $c \bar c g$-Fock states improves the description at small $x$ commonly associated with gluon shadowing. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_10371 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gluon shadowing in nuclei and the role of the $c \bar c g$ state in the coherent photoproduction of $J/ψ$ in nucleus-nucleus collisions Łuszczak, Agnieszka Schäfer, Wolfgang High Energy Physics - Phenomenology In this brief note, we confront our results on diffractive photoproduction of $J/ψ$ mesons with the putative gluon shadowing ratio defined as $R_g= \sqrt{σ(γA \to J/ψA)/σ_{\rm IA.}}$, where $σ_{\rm IA}$ is the result in impulse approximation. Building on our earlier description of the process in the color-dipole approach, where we took into account the rescattering of $c \bar c$ states only, we demonstrate that the inclusion of $c \bar c g$-Fock states improves the description at small $x$ commonly associated with gluon shadowing. |
| title | Gluon shadowing in nuclei and the role of the $c \bar c g$ state in the coherent photoproduction of $J/ψ$ in nucleus-nucleus collisions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2406.10371 |