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@TECHREPORT{Collaboration:599320,
      key          = {599320},
      collaboration = {{ATLAS Collaboration}},
      title        = {{C}harged-hadron yield measurements in photo-nuclear
                      collisions using 5.02 {T}e{V} {P}b+{P}b data with {ATLAS}},
      number       = {ATLAS-CONF-2023-059},
      reportid     = {PUBDB-2023-07316, ATLAS-CONF-2023-059. ATLAS-CONF-2023-059},
      pages        = {23},
      year         = {2023},
      note         = {All figures including auxiliary figures are available at
                      https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2023-059},
      abstract     = {This note presents the analysis of charged-hadron
                      measurements in photo-nuclear collisions using 1.73
                      $\mathrm{nb^{-1}}$ 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 ($p_{\mathrm{T}}$) and pseudorapidity
                      ($\eta$) is measured in these photo-nuclear collisions as a
                      function of charged-particle multiplicity. The results are
                      compared with 0.10 $\mathrm{nb^{-1}}$ 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.},
      keywords     = {talk (INSPIRE) / heavy ion: scattering (INSPIRE) / lead
                      (INSPIRE) / photoproduction (INSPIRE) / charged particle:
                      multiplicity (INSPIRE) / quark gluon: plasma (INSPIRE) /
                      photon: energy (INSPIRE) / photon: spectrum (INSPIRE) /
                      equivalent photon approximation (INSPIRE) / calorimeter:
                      forward spectrometer (INSPIRE) / trigger (INSPIRE) /
                      rapidity: gap (INSPIRE) / ATLAS (INSPIRE) / droplet
                      (INSPIRE) / numerical calculations: Monte Carlo (INSPIRE) /
                      flow (INSPIRE) / transverse momentum dependence (INSPIRE) /
                      rapidity dependence (INSPIRE) / hydrodynamics (INSPIRE) /
                      background (INSPIRE) / hadron: yield (INSPIRE) / tracks
                      (INSPIRE) / track data analysis (INSPIRE) / data analysis
                      method (INSPIRE) / experimental results (INSPIRE) / 5020
                      GeV-cms/nucleon (INSPIRE) / HEAVYIONS (autogen) /
                      Charged-hadron (autogen) / yield (autogen) / photo-nuclear
                      (autogen) / UPC (autogen)},
      cin          = {ATLAS},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)29},
      doi          = {10.3204/PUBDB-2023-07316},
      url          = {https://bib-pubdb1.desy.de/record/599320},
}