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https://hdl.handle.net/20.500.13091/5143
Title: | Probing Small Bjorken-x Nuclear Gluonic Structure via Coherent J=ψ Photoproduction in Ultraperipheral Pb-Pb Collisions at √sNN = 5.02 TeV | Authors: | Tumasyan A. Adam W. Andrejkovic J.W. Bergauer T. Chatterjee S. Damanakis K. Dragicevic M. |
Keywords: | Binary alloys Germanium alloys Heavy ions Ion exchange Lead alloys Tellurium compounds Center-of-mass energies Centre-of-mass energies Heaviest nuclei Heavy ion interactions Integrated luminosity Lead collisions Nucleon-nucleon Pb-Pb collisions Photoproductions Relativistic heavy ions Photons article controlled study diagnosis |
Publisher: | American Physical Society | Abstract: | Quasireal photons exchanged in relativistic heavy ion interactions are powerful probes of the gluonic structure of nuclei. The coherent J=ψ photoproduction cross section in ultraperipheral lead-lead collisions is measured as a function of photon-nucleus center-of-mass energies per nucleon (WPbγN) over a wide range of 40 < WPbγN < 400 GeV. Results are obtained using data at the nucleon-nucleon center-of-mass energy of 5.02 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 1.52 nb−1. The cross section is observed to rise rapidly at low WPbγN, and plateau above WPbγN ≈ 40 GeV, up to 400 GeV, entering a new regime of small Bjorken-x (≈6 × 10−5) gluons being probed in a heavy nucleus. The observed energy dependence is not predicted by current quantum chromodynamic models. © 2023 CERN, for the CMS Collaboration. | URI: | https://doi.org/10.1103/PhysRevLett.131.262301 https://hdl.handle.net/20.500.13091/5143 |
ISSN: | 0031-9007 |
Appears in Collections: | PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collections Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections |
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