Observation of strong nuclear suppression in exclusive 𝐽/𝜓 photoproduction in Au+Au ultraperipheral collisions at RHIC
We report a measurement of exclusive 𝐽/𝜓 and 𝜓(2𝑠) photoproduction in Au+Au ultraperipheral collisions at √𝑠NN=200 GeV using the STAR detector. For the first time, (i) the 𝜓(2𝑠) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured; (ii) nuclear s...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
31 July, 2024
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| In: |
Physical review letters
Year: 2024, Jahrgang: 133, Heft: 5, Pages: 1-9 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.133.052301 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.133.052301 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.133.052301 
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| Verfasserangaben: | M.I. Abdulhamid, I.M. Deppner, N. Herrmann, Y.H. Leung, Y. Söhngen (STAR Collaboration) |
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| 245 | 0 | 0 | |a Observation of strong nuclear suppression in exclusive / photoproduction in Au+Au ultraperipheral collisions at RHIC |c M.I. Abdulhamid, I.M. Deppner, N. Herrmann, Y.H. Leung, Y. Söhngen (STAR Collaboration) |
| 246 | 3 | 3 | |a Observation of strong nuclear suppression in exclusive /psi photoproduction in Au plus Au ultraperipheral collisions at RHIC |
| 264 | 1 | |c 31 July, 2024 | |
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| 520 | |a We report a measurement of exclusive / and (2) photoproduction in Au+Au ultraperipheral collisions at √NN=200 GeV using the STAR detector. For the first time, (i) the (2) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured; (ii) nuclear suppression factors are measured for both the coherent and incoherent / production. At average photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent / cross sections of Au nuclei are found to be 71 ±10% and 36 ±7%, 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. | ||
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