Evidence of shadowing in inelastic nucleon-nucleon cross section

Kari J. Eskola, Ilkka Helenius, Mikko Kuha, Hannu Paukkunen

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The Glauber modeling plays a key role in centrality-dependent measurements of heavy-ion collisions. A central input parameter in Glauber models is the inelastic nucleon-nucleon cross section σinel which is nearly always taken from proton-proton measurements. At the LHC energies nn σinel depends on the QCD dynamics at small x and low interaction scales where the shadownn ing/saturation phenomena are expected to become relatively more important for larger nuclei than for the proton. Thus, σnninel e.g. in Pb+Pb collisions may well be lower than what is seen in proton-proton collisions. In this talk, we demonstrate how to use the recent W± and Z measurements as a "standard candle" to extract σnninel in Pb+Pb collisions. Our analysis - built on the ATLAS data, state-of-the-art NNLO QCD calculations and nuclear PDFs - indicate that at the LHC energies σinel in Pb+Pb collisions is suppressed relative to the proton-proton measurements by tens of nn percents. We demonstrate that this is in line with expectations from nuclear PDFs.

TidskriftProceedings of Science
Antal sidor5
StatusPublicerad - 1 sep. 2021
MoE-publikationstypA4 Artikel i en konferenspublikation
EvenemangInternational Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions - Austin, Förenta Staterna (USA)
Varaktighet: 1 juni 20206 juni 2020
Konferensnummer: 10

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