{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.96391.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1286656"}},{"@id":"https://doi.org/10.1103/PhysRevC.92.014904","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2020","description":"We present results of analyses of two-pion interferometry in Au+Au collisions at $\\sqrt{sNN}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV measured in the STAR detector as part of the RHIC Beam Energy Scan program. The extracted correlation lengths (HBT radii) are studied as a function of beam energy, azimuthal angle relative to the reaction plane, centrality, and transverse mass ($m_T$) of the particles. The azimuthal analysis allows extraction of the eccentricity of the entire fireball at kinetic freeze-out. The energy dependence of this observable is expected to be sensitive to changes in the equation of state. A new global fit method is studied as an alternate method to directly measure the parameters in the azimuthal analysis. The eccentricity shows a monotonic decrease with beam energy that is qualitatively consistent with the trend from all model predictions and quantitatively consistent with a hadronic transport model.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t1","@type":"Dataset","description":"Angular oscillations of the HBT radii relative to the event plane from 20-30% central, 19.6 GeV Au+Au collisions for 0.15...","name":"Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t2","@type":"Dataset","description":"Angular oscillations of the HBT radii relative to the event plane from 20-30% central, 19.6 GeV Au+Au collisions for 0.15...","name":"Figure 4.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t3","@type":"Dataset","description":"Angular oscillations of the HBT radii relative to the event plane from 20-30% central, 19.6 GeV Au+Au collisions for 0.15...","name":"Figure 4.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t4","@type":"Dataset","description":"Sample fit projections onto the $q_{out}$, $q_{side}$, and $q_{long}$ axes respectively for four angular bins relative to the reaction. These...","name":"Figure 5"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t5","@type":"Dataset","description":"Energy dependence of the HBT parameters for central Au+Au, Pb+Pb, and Pb+Au collisions at mid-rapidity and $\\langle k_T \\rangle \\approx...","name":"Figure 6"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t6","@type":"Dataset","description":"The $\\langle m_T \\rangle$ dependence of $R_{out}$, $R_{side}$ and $R_{long}$ for all energies at 0-5% centrality. Errors are statistical only....","name":"Figure 7"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t7","@type":"Dataset","description":"The $\\langle m_T \\rangle$ dependence of $R_{out}$, $R_{side}$ and $R_{long}$ for each energy and multiple centralities. Errors are statistical only.","name":"Figure 8"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t8","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t9","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t10","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.3"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t11","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.4"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t12","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.5"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t13","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.6"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t14","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.7"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t15","@type":"Dataset","description":"The dependence of the HBT radii on multiplicity,$\\langle dN_{ch}/d\\eta \\rangle^{1/3}$, for $k_T\\approx 0.22$ GeV/c and$k_T\\approx 0.39$ GeV/c. Results are for...","name":"Figure 9.8"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t16","@type":"Dataset","description":"The beam energy dependence of the volume of the regions of homogeneity at kinetic freeze-out in central Au+Au, Pb+Pb and...","name":"Figure 10"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t17","@type":"Dataset","description":"The lifetime, $\\tau$, of the system as a function of beam energy for central Au+Au collisions assuming a temperature of...","name":"Figure 11"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t18","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 12.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t19","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 12.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t20","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1)and mid(\u22120.5<y< 0.5) rapidity,...","name":"Figure 13"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t21","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 14.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t22","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 14.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t23","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1) and mid(\u22120.5<y< 0.5)...","name":"Figure 15"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t24","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 16.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t25","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 16.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t26","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1) and mid(\u22120.5<y< 0.5)...","name":"Figure 17"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t27","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 18.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t28","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 18.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t29","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1) and mid(\u22120.5<y< 0.5)...","name":"Figure 19"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t30","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 20.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t31","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 20.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t32","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1) and mid(\u22120.5<y< 0.5)...","name":"Figure 21"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t33","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 22.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t34","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 22.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t35","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1) and mid(\u22120.5<y< 0.5)...","name":"Figure 23"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t36","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 24.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t37","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at mid-rapidity (\u22120.5 < y <...","name":"Figure 24.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t38","@type":"Dataset","description":"Centrality dependence of the Fourier coefficients that describe azimuthal oscillations of the HBT radii, at backward(\u22121<y<\u22120.5), forward(0.5<y<1) and mid(\u22120.5<y< 0.5)...","name":"Figure 25"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t39","@type":"Dataset","description":"Beam energy dependence of the $R_{ol,0}^2$ cross term for forward and backward rapidity with \u27e8$k_T$\u27e9 \u2248 0.31 GeV/c.","name":"Figure 26"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t40","@type":"Dataset","description":"The eccentricity of the collisions at kinetic freez-out, \u03b5F , as a function of initial eccentricity relative to the participant...","name":"Figure 27"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t41","@type":"Dataset","description":"The dependence of the kinetic freeze-out eccentricity of pions on collision energy in mid-central Au+Au collisions (E895, STAR) and Pb+Au...","name":"Figure 28.1"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t42","@type":"Dataset","description":"The dependence of the kinetic freeze-out eccentricity of pions on collision energy in mid-central Au+Au collisions using UrQMD calculations, (2+1)D...","name":"Figure 28.2"},{"@id":"https://doi.org/10.17182/hepdata.96391.v1/t43","@type":"Dataset","description":"The dependence of the kinetic freeze-out eccentricity of pions on collision energy in mid-central Au+Au collisions using (2+1)D hydro EOS-Q,...","name":"Figure 28.3"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1286656?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/96391"}],"inLanguage":"en","name":"Beam energy dependent two-pion interferometry and the freeze-out eccentricity of pions in heavy ion collisions at STAR","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1286656?version=1","version":1}