{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.101346.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/927960"}},{"@id":"https://doi.org/10.1103/PhysRevC.86.064902","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2021","description":"We present two-dimensional (2D) two-particle angular correlations on relative pseudorapidity $\\eta$ and azimuth $\\phi$ for charged particles from Au-Au collisions at $\\sqrt{s_{\\mathrm{NN}}}=62$ and $200 \\mathrm{GeV}$ with transverse momentum $p_{t} \\geq 0.15 \\mathrm{GeV} / c,|\\eta| \\leq 1$ and $2 \\pi$ azimuth. Observed correlations include $\\mathrm{a}$ $\\{$ same-side $\\}$ (relative azimuth $<\\pi / 2$ ) $2 \\mathrm{D}$ peak, a closely-related away-side azimuth dipole, and an azimuth quadrupole conventionally associated with elliptic flow. The same-side 2 D peak and away-side dipole are explained by semihard parton scattering and fragmentation (minijets) in proton-proton and peripheral nucleus-nucleus collisions. Those structures follow N-N binary-collision scaling in Au-Au collisions until midcentrality where a transition to a qualitatively different centrality trend occurs within a small centrality interval. Above the transition point the number of same-side and away-side correlated pairs increases rapidly \\{relative to $\\}$ binary-collision scaling, the $\\eta$ width of the same-side $2 \\mathrm{D}$ peak also increases rapidly $(\\eta$ elongation) and the $\\phi$ width actually decreases significantly. Those centrality trends are more remarkable when contrasted with expectations of jet quenching in a dense medium. Observed centrality trends are compared to \\{ Isc hijing\\} predictions and to the expected trends for semihard parton scattering and fragmentation in a thermalized opaque medium. We are unable to reconcile a semihard parton scattering and fragmentation origin for the observed correlation structure and centrality trends with heavy ion collision scenarios which invoke rapid parton thermalization. On the other hand, if the collision system is effectively opaque to few-GeV partons the observations reported here would be inconsistent with a minijet picture.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t1","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1a"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t2","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1b"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t3","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1c"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t4","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1d"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t5","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1e"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t6","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1f"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t7","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1g"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t8","@type":"Dataset","description":"FIG. 1. (Color online) Perspective views of $2 \\mathrm{D}$ charge-independent angular correlations $\\Delta \\rho / \\sqrt{\\rho_{\\mathrm{ref}}}$ on $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ for...","name":"Figure 1h"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t9","@type":"Dataset","description":"FIG. 2. (Color online) Fit decomposition of the $46 \\%-56 \\%$ centrality data for 62 -GeV Au-Au collisions. The top...","name":"Figure 2a"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t10","@type":"Dataset","description":"FIG. 3. Fit parameters for $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ correlation data from Au-Au collisions at $\\sqrt{s_{N N}}=62$ (open symbols) and 200 GeV...","name":"Figure 3a"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t11","@type":"Dataset","description":"FIG. 3. Fit parameters for $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ correlation data from Au-Au collisions at $\\sqrt{s_{N N}}=62$ (open symbols) and 200 GeV...","name":"Figure 3b"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t12","@type":"Dataset","description":"FIG. 3. Fit parameters for $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ correlation data from Au-Au collisions at $\\sqrt{s_{N N}}=62$ (open symbols) and 200 GeV...","name":"Figure 3c"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t13","@type":"Dataset","description":"FIG. 3. Fit parameters for $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ correlation data from Au-Au collisions at $\\sqrt{s_{N N}}=62$ (open symbols) and 200 GeV...","name":"Figure 3d"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t14","@type":"Dataset","description":"FIG. 3. Fit parameters for $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ correlation data from Au-Au collisions at $\\sqrt{s_{N N}}=62$ (open symbols) and 200 GeV...","name":"Figure 3e"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t15","@type":"Dataset","description":"FIG. 3. Fit parameters for $\\left(\\eta_{\\Delta}, \\phi_{\\Delta}\\right)$ correlation data from Au-Au collisions at $\\sqrt{s_{N N}}=62$ (open symbols) and 200 GeV...","name":"Figure 3f"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t16","@type":"Dataset","description":"FIG. 4. (Color online) (a) 2D data histogram from $0 \\%-5 \\%$ central 200 GeV Au-Au collisions $[(0,0)$ bin suppressed]....","name":"Figure 4a"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t17","@type":"Dataset","description":"FIG. 9. (a) Amplitude of SS 2D peak (jet-correlated pairs per final-state hadron) for data (solid points), GLS extrapolation from...","name":"Figure 9a"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t18","@type":"Dataset","description":"FIG. 9. (a) Amplitude of SS 2D peak (jet-correlated pairs per final-state hadron) for data (solid points), GLS extrapolation from...","name":"Figure 9b"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t19","@type":"Dataset","description":"FIG. 9. (a) Amplitude of SS 2D peak (jet-correlated pairs per final-state hadron) for data (solid points), GLS extrapolation from...","name":"Figure 9c"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t20","@type":"Dataset","description":"FIG. 9. (a) Amplitude of SS 2D peak (jet-correlated pairs per final-state hadron) for data (solid points), GLS extrapolation from...","name":"Figure 9d"},{"@id":"https://doi.org/10.17182/hepdata.101346.v1/t21","@type":"Dataset","description":"FIG. 11. (Color online) (Left) Uncorrected angular correlations from 62-GeV $37 \\%-46 \\%$ central Au-Au collisions showing pileup distortions, especially...","name":"Figure 11"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins927960?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/101346"}],"inLanguage":"en","name":"Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions at $\\sqrt{s_{\\rm NN}}$ = 62 and 200 GeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins927960?version=1","version":1}