{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.158635.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2898746"}},{"@id":"https://doi.org/10.1103/7lx4-x8rw","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"This paper presents the measurement of charged-hadron and identified-hadron (K^{0}_{S}, #Lambda, #Xi^{-}) yields in photo-nuclear collisions using 1.7 nb^{-1} of #sqrt{s_{NN}} = 5.02 TeV Pb+Pb data collected in 2018 with the ATLAS detector at the Large Hadron Collider. Candidate photo-nuclear events are selected using a combination of tracking and calorimeter information, including the zero-degree calorimeter. The yields as a function of transverse momentum and rapidity are measured in these photo-nuclear collisions as a function of charged-particle multiplicity. These photo-nuclear results are compared with 0.1 nb^{-1} of #sqrt{s_{NN}} = 5.02 TeV p+Pb data collected in 2016 by ATLAS using similar charged-particle multiplicity selections. These photo-nuclear measurements shed light on potential quark-gluon plasma formation in photo-nuclear collisions via observables sensitive to radial flow, enhanced baryon-to-meson ratios, and strangeness enhancement. The results are also compared with the Monte Carlo DPMJET generator and hydrodynamic calculations to test whether such photo-nuclear collisions may produce small droplets of quark-gluon plasma that flow collectively.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t1","@type":"Dataset","description":"The multiplicity distribution (#it{N}_{ch}^{rec}) from Pb+Pb photo-nuclear collisions.","name":"Nchrec distribution in #gamma+Pb collisions"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t2","@type":"Dataset","description":"The multiplicity distribution (#it{N}_{ch}^{rec}) from p+Pb collisions.","name":"Multiplicity distribution in p+Pb collisions"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t3","@type":"Dataset","description":"The Charged-hadron yields as a function of pT in different y selections in Pb+Pb photo-nuclear collisions.","name":"Charged-hadron yields as a function of pT in #gamma+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t4","@type":"Dataset","description":"The Charged-hadron yields as a function of pT in different y selections in p+Pb collisions.","name":"Charged-hadron yields as a function of pT in p+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t5","@type":"Dataset","description":"The K^{0}_{S} yields as a function of pT in different y selections in Pb+Pb photo-nuclear collisions.","name":"K^{0}_{S} yields as a function of pT in #gamma+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t6","@type":"Dataset","description":"The #Lambda yields as a function of pT in different y selections in Pb+Pb photo-nuclear collisions.","name":"#Lambda yields as a function of pT in #gamma+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t7","@type":"Dataset","description":"The #Xi^{-} yields as a function of pT in different y selections in Pb+Pb photo-nuclear collisions.","name":"#Xi^{-} yields as a function of pT in #gamma+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t8","@type":"Dataset","description":"The K^{0}_{S} yields as a function of pT in different y selections in p+Pb collisions.","name":"K^{0}_{S} yields as a function of pT in p+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t9","@type":"Dataset","description":"The #Lambda yields as a function of pT in different y selections in p+Pb collisions.","name":"#Lambda yields as a function of pT in p+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t10","@type":"Dataset","description":"The #Xi^{-} yields as a function of pT in different y selections in p+Pb collisions.","name":"#Xi^{-} yields as a function of pT in p+Pb"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t11","@type":"Dataset","description":"The Charged-hadron and identified-hadron yields as a function of y in Pb+Pb photo-nuclear collisions.","name":"Yields as a function of y in #gamma+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t12","@type":"Dataset","description":"The Charged-hadron and identified-hadron yields as a function of y in Pb+Pb photo-nuclear collisions.","name":"Yields as a function of y in #gamma+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t13","@type":"Dataset","description":"The Charged-hadron and identified-hadron yields as a function of y in p+Pb collisions.","name":"Yields as a function of y in p+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t14","@type":"Dataset","description":"The Charged-hadron and identified-hadron yields as a function of y in p+Pb collisions.","name":"Yields as a function of y in p+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t15","@type":"Dataset","description":"The meanpT of charged hadrons and identified hadrons as a function of Nchrec in Pb+Pb photo-nuclear collisions.","name":"MeanpT as a function of Nchrec in #gamma+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t16","@type":"Dataset","description":"The meanpT of charged hadrons and identified hadrons as a function of Nchrec in Pb+Pb photo-nuclear collisions.","name":"MeanpT as a function of Nchrec in #gamma+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t17","@type":"Dataset","description":"The meanpT of charged hadrons and identified hadrons as a function of Nchrec in Pb+Pb photo-nuclear collisions.","name":"MeanpT as a function of Nchrec in #gamma+Pb - Curve 3"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t18","@type":"Dataset","description":"The meanpT of charged hadrons and identified hadrons as a function of Nchrec in p+Pb collisions.","name":"MeanpT as a function of Nchrec in p+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t19","@type":"Dataset","description":"The meanpT of charged hadrons and identified hadrons as a function of Nchrec in p+Pb collisions.","name":"MeanpT as a function of Nchrec in p+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t20","@type":"Dataset","description":"The baryon to meson ratio as a function of pT in Pb+Pb photo-nuclear collisions.","name":"Baryon/Meson as a function of pT in #gamma+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t21","@type":"Dataset","description":"The baryon to meson ratio as a function of pT in Pb+Pb photo-nuclear collisions.","name":"Baryon/Meson as a function of pT in #gamma+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t22","@type":"Dataset","description":"The baryon to meson ratio as a function of pT in p+Pb collisions.","name":"Baryon/Meson as a function of pT in p+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t23","@type":"Dataset","description":"The baryon to meson ratio as a function of pT in p+Pb collisions.","name":"Baryon/Meson as a function of pT in p+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t24","@type":"Dataset","description":"The ratios of identified-strange-hadron yield to charged-hadron yields as a function of Nchrec in Pb+Pb photo-nuclear collisions.","name":"Strange/charged hadrons in #gamma+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t25","@type":"Dataset","description":"The ratios of identified-strange-hadron yield to charged-hadron yields as a function of Nchrec in Pb+Pb photo-nuclear collisions.","name":"Strange/charged hadrons in #gamma+Pb - Curve 2"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t26","@type":"Dataset","description":"The ratios of identified-strange-hadron yield to charged-hadron yields as a function of Nchrec in Pb+Pb photo-nuclear collisions.","name":"Strange/charged hadrons in #gamma+Pb - Curve 3"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t27","@type":"Dataset","description":"The ratios of identified-strange-hadron yield to charged-hadron yields as a function of Nchrec in p+Pb collisions.","name":"Strange/charged hadrons in p+Pb - Curve 1"},{"@id":"https://doi.org/10.17182/hepdata.158635.v1/t28","@type":"Dataset","description":"The ratios of identified-strange-hadron yield to charged-hadron yields as a function of Nchrec in p+Pb collisions.","name":"Strange/charged hadrons in p+Pb - Curve 2"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2898746?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/158635"}],"inLanguage":"en","name":"Charged-hadron and identified-hadron ($K^\\mathrm{0}_\\mathrm{S}$, $\u039b$, $\u039e^\\mathrm{-}$) yield measurements in photo-nuclear Pb+Pb and $p$+Pb collisions at $\\sqrt{s_\\mathrm{NN}} = 5.02$ TeV with ATLAS","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2898746?version=1","version":1}