Observation of strong nuclear suppression in exclusive $J/ψ$ photoproduction in Au$+$Au ultra-peripheral collisions at RHIC
Fuente:
arXiv
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866917738972184576 |
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| author | STAR Collaboration |
| author_facet | STAR Collaboration |
| contents | We report a measurement of exclusive $J/ψ$ photoproduction in Au$+$Au ultra-peripheral collisions at $\sqrt{s_{_\mathrm{NN}}}=200$ GeV using the STAR detector. For the first time, i) the rapidity correlation between $J/ψ$ photoproduction and neutron emission from nuclear breakups has been experimentally measured; ii) nuclear suppression factors are measured for both the coherent and incoherent $J/ψ$ production. At photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent $J/ψ$ cross sections of Au nuclei are found to be $71\pm10\%$ and $36\pm7\%$, respectively, of that of free protons. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_13637 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of strong nuclear suppression in exclusive $J/ψ$ photoproduction in Au$+$Au ultra-peripheral collisions at RHIC STAR Collaboration Nuclear Experiment High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Theory We report a measurement of exclusive $J/ψ$ photoproduction in Au$+$Au ultra-peripheral collisions at $\sqrt{s_{_\mathrm{NN}}}=200$ GeV using the STAR detector. For the first time, i) the rapidity correlation between $J/ψ$ photoproduction and neutron emission from nuclear breakups has been experimentally measured; ii) nuclear suppression factors are measured for both the coherent and incoherent $J/ψ$ production. At photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent $J/ψ$ cross sections of Au nuclei are found to be $71\pm10\%$ and $36\pm7\%$, respectively, of that of free protons. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively. |
| title | Observation of strong nuclear suppression in exclusive $J/ψ$ photoproduction in Au$+$Au ultra-peripheral collisions at RHIC |
| topic | Nuclear Experiment High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2311.13637 |