nNNPDF3.0: evidence for a modified partonic structure in heavy nuclei

Abdul Khalek, Rabah; Gauld, Rhorry; Giani, Tommaso; Nocera, Emanuele R.; Rabemananjara, Tanjona R.; Rojo, Juan

doi:10.1140/epjc/s10052-022-10417-7

nNNPDF3.0: evidence for a modified partonic structure in heavy nuclei

Rabah Abdul Khalek
(
- Vrije U., Amsterdam and
- Nikhef, Amsterdam
)
,
Rhorry Gauld
(
- Bonn U.
)
,
Tommaso Giani
(
- Vrije U., Amsterdam and
- Nikhef, Amsterdam
)
,
Emanuele R. Nocera
(
- U. Edinburgh, Higgs Ctr. Theor. Phys.
)
,
Tanjona R. Rabemananjara
(
- Vrije U., Amsterdam and
- Nikhef, Amsterdam and
- INFN, Milan and
- Milan U.
)

Jan 28, 2022

61 pages

Published in:

Eur.Phys.J.C 82 (2022) 6, 507

Published: Jun 3, 2022

e-Print:

2201.12363 [hep-ph]

DOI:

10.1140/epjc/s10052-022-10417-7

Report number:

Nikhef-2021-028,
BONN-TH-2021-14

View in:

ADS Abstract Service

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Abstract: (Springer)

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.

Note:

61 pages, 38 figures

nucleus: heavy
gluon: shadowing
quark: sea
neutrino nucleon: cross section
nucleus: target
heavy ion: scattering
parton: distribution function
p nucleus: scattering
UHE
quantum chromodynamics

References(152)

Figures(0)

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