{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.95233.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1829248"}},{"@id":"https://doi.org/10.1103/PhysRevLett.127.122001","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2021","description":"The first measurement of the dependence of $\\gamma\\gamma \\to \\mu^{+}\\mu^{-}$ production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV, with an integrated luminosity of approximately 1.5 nb$^{-1}$, were collected using the CMS detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region $8 < m_{\\mu\\mu} < 60$ GeV are extracted for events including zero, one, or at least two neutrons detected in the forward pseudorapidity range $|{\\eta}| > 8.3$. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This observation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possible final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t1","@type":"Dataset","description":"Neutron multiplicity dependence of acoplanarity ($\\alpha$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t2","@type":"Dataset","description":"Neutron multiplicity dependence of acoplanarity ($\\alpha$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t3","@type":"Dataset","description":"Neutron multiplicity dependence of acoplanarity ($\\alpha$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t4","@type":"Dataset","description":"Neutron multiplicity dependence of acoplanarity ($\\alpha$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t5","@type":"Dataset","description":"Neutron multiplicity dependence of acoplanarity ($\\alpha$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t6","@type":"Dataset","description":"Neutron multiplicity dependence of acoplanarity ($\\alpha$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t7","@type":"Dataset","description":"Neutron multiplicity dependence of average core acoplanarity ($<\\alpha^{core}>$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t8","@type":"Dataset","description":"Neutron multiplicity dependence of average invariant mass ($$) from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV.","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t9","@type":"Dataset","description":"Acoplanarity ($\\alpha$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ for 0n1n class in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV. Dimuon rapidity is...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t10","@type":"Dataset","description":"Acoplanarity ($\\alpha$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ for 0nXn class in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV. Dimuon rapidity is...","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t11","@type":"Dataset","description":"Acoplanarity ($\\alpha$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ for 1nXn class in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV. Dimuon rapidity is...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t12","@type":"Dataset","description":"Acoplanarity ($\\alpha$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ for 0n1n class in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV. Dimuon rapidity is...","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t13","@type":"Dataset","description":"Acoplanarity ($\\alpha$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ for 0nXn class in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV. Dimuon rapidity is...","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.95233.v1/t14","@type":"Dataset","description":"Acoplanarity ($\\alpha$) distributions from process $\\gamma\\gamma$ to $\\mu^+\\mu^-$ for 1nXn class in ultraperipheral PbPb at $\\sqrt{s_{NN}}=5.02$ TeV. Dimuon rapidity is...","name":"Table 14"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1829248?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/95233"}],"inLanguage":"en","name":"Observation of forward neutron multiplicity dependence of dimuon acoplanarity in ultraperipheral PbPb collisions at $\\sqrt{s_\\mathrm{NN}} =$ 5.02 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1829248?version=1","version":1}