%0 Report
%T Charged-hadron yield measurements in photo-nuclear collisions using 5.02 TeV Pb+Pb data with ATLAS
%N ATLAS-CONF-2023-059
%M PUBDB-2023-07316
%M ATLAS-CONF-2023-059
%M ATLAS-CONF-2023-059
%P 23
%D 2023
%Z All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2023-059
%X This note presents the analysis of charged-hadron measurements in photo-nuclear collisions using 1.73 nb<sup>−1</sup> of 5.02 TeV Pb+Pb data collected in 2018 by ATLAS. Candidate photo-nuclear events are selected and background events rejected using a combination of zero degree calorimeter, pseudorapidity gap, and tracking information. The yield of charged hadrons as a function of transverse momentum (p<sub>T</sub>) and pseudorapidity (η) is measured in these photo-nuclear collisions as a function of charged-particle multiplicity. The results are compared with 0.10 nb<sup>−1</sup> of 5.02 TeV p+Pb data collected in 2016 by ATLAS using similar charged-particle multiplicity selections. These photo-nuclear measurements are important for constraining the photon energy distribution and particle production in Monte Carlo models such as DPMJET-III. Additionally, the results are important to test whether such photo-nuclear collisions may produce small droplets of quark-gluon plasma that flow hydrodynamically.
%K talk (INSPIRE)
%K heavy ion: scattering (INSPIRE)
%K lead (INSPIRE)
%K photoproduction (INSPIRE)
%K charged particle: multiplicity (INSPIRE)
%K quark gluon: plasma (INSPIRE)
%K photon: energy (INSPIRE)
%K photon: spectrum (INSPIRE)
%K equivalent photon approximation (INSPIRE)
%K calorimeter: forward spectrometer (INSPIRE)
%K trigger (INSPIRE)
%K rapidity: gap (INSPIRE)
%K ATLAS (INSPIRE)
%K droplet (INSPIRE)
%K numerical calculations: Monte Carlo (INSPIRE)
%K flow (INSPIRE)
%K transverse momentum dependence (INSPIRE)
%K rapidity dependence (INSPIRE)
%K hydrodynamics (INSPIRE)
%K background (INSPIRE)
%K hadron: yield (INSPIRE)
%K tracks (INSPIRE)
%K track data analysis (INSPIRE)
%K data analysis method (INSPIRE)
%K experimental results (INSPIRE)
%K 5020 GeV-cms/nucleon (INSPIRE)
%K HEAVYIONS (autogen)
%K Charged-hadron (autogen)
%K yield (autogen)
%K photo-nuclear (autogen)
%K UPC (autogen)
%F PUB:(DE-HGF)29
%9 Report
%R 10.3204/PUBDB-2023-07316
%U https://bib-pubdb1.desy.de/record/599320