期刊
EUROPEAN PHYSICAL JOURNAL C
卷 82, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-022-10417-7
关键词
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资金
- Dutch Research Council (NWO)
- NWO
- U.K. Science and Technology Facility Council (STFC) [ST/P000630/1]
- ASDI grant of The Netherlands eScience Center
This paper presents an updated determination of nuclear parton distributions (nPDFs) through a global NLO QCD analysis of hard processes. It takes into account data from fixed-target lepton-nucleus and proton-nucleus experiments as well as collider proton-nucleus experiments. The constraints from various measurements are considered for the first time in a global nPDF analysis and applied to both the nuclear PDFs and the free-proton PDF baseline. The results show evidence of nuclear-induced modifications to the partonic structure of heavy nuclei and have important implications for ongoing and future experimental programs.
We present an updated determination of nuclear parton distributions (nPDFs) from a global NLO QCD analysis of hard processes in fixed-target lepton-nucleus and proton-nucleus together with collider proton-nucleus experiments. In addition to neutral- and charged-current deep-inelastic and Drell-Yan measurements on nuclear targets, we consider the information provided by the production of electroweak gauge bosons, isolated photons, jet pairs, and charmed mesons in proton-lead collisions at the LHC across centre-of-mass energies of 5.02 TeV (Run I) and 8.16 TeV (Run II). For the first time in a global nPDF analysis, the constraints from these various processes are accounted for both in the nuclear PDFs and in the free-proton PDF baseline. The extensive dataset underlying the nNNPDF3.0 determination, combined with its model-independent parametrisation, reveals strong evidence for nuclear-induced modifications of the partonic structure of heavy nuclei, specifically for the small-x shadowing of gluons and sea quarks, as well as the large-x anti-shadowing of gluons. As a representative phenomenological application, we provide predictions for ultra-high-energy neutrino-nucleon cross-sections, relevant for data interpretation at neutrino observatories. Our results provide key input for ongoing and future experimental programs, from that of heavy-ion collisions in controlled collider environments to the study of high-energy astrophysical processes.
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