TY  - RPRT
TI  - Charged-hadron yield measurements in photo-nuclear collisions using 5.02 TeV Pb+Pb data with ATLAS
IS  - ATLAS-CONF-2023-059
M1  - PUBDB-2023-07316
M1  - ATLAS-CONF-2023-059
M1  - ATLAS-CONF-2023-059
SP  - 23
PY  - 2023
N1  - All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2023-059
AB  - 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.
KW  - talk (INSPIRE)
KW  - heavy ion: scattering (INSPIRE)
KW  - lead (INSPIRE)
KW  - photoproduction (INSPIRE)
KW  - charged particle: multiplicity (INSPIRE)
KW  - quark gluon: plasma (INSPIRE)
KW  - photon: energy (INSPIRE)
KW  - photon: spectrum (INSPIRE)
KW  - equivalent photon approximation (INSPIRE)
KW  - calorimeter: forward spectrometer (INSPIRE)
KW  - trigger (INSPIRE)
KW  - rapidity: gap (INSPIRE)
KW  - ATLAS (INSPIRE)
KW  - droplet (INSPIRE)
KW  - numerical calculations: Monte Carlo (INSPIRE)
KW  - flow (INSPIRE)
KW  - transverse momentum dependence (INSPIRE)
KW  - rapidity dependence (INSPIRE)
KW  - hydrodynamics (INSPIRE)
KW  - background (INSPIRE)
KW  - hadron: yield (INSPIRE)
KW  - tracks (INSPIRE)
KW  - track data analysis (INSPIRE)
KW  - data analysis method (INSPIRE)
KW  - experimental results (INSPIRE)
KW  - 5020 GeV-cms/nucleon (INSPIRE)
KW  - HEAVYIONS (autogen)
KW  - Charged-hadron (autogen)
KW  - yield (autogen)
KW  - photo-nuclear (autogen)
KW  - UPC (autogen)
LB  - PUB:(DE-HGF)29
DO  - DOI:10.3204/PUBDB-2023-07316
UR  - https://bib-pubdb1.desy.de/record/599320
ER  -