{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.101341.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/955160"}},{"@id":"https://doi.org/10.1103/PhysRevC.86.014904","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2021","description":"We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants $v_2$ ($v_2\\{2\\}$ and $v_2\\{4\\}$) for Au+Au and Cu+Cu collisions at center of mass energies $\\sqrt{s_{_{\\mathrm{NN}}}} = 62.4$ and 200 GeV. The difference between $v_2\\{2\\}^2$ and $v_2\\{4\\}^2$ is related to $v_{2}$ fluctuations ($\\sigma_{v_2}$) and nonflow $(\\delta_{2})$. We present an upper limit to $\\sigma_{v_2}/v_{2}$. Following the assumption that eccentricity fluctuations $\\sigma_{\\epsilon}$ dominate $v_2$ fluctuations $\\frac{\\sigma_{v_2}}{v_2} \\approx \\frac{\\sigma_{\\epsilon}}{\\epsilon}$ we deduce the nonflow implied for several models of eccentricity fluctuations that would be required for consistency with $v_2\\{2\\}$ and $v_2\\{4\\}$. We also present results on the ratio of $v_2$ to eccentricity.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t1","@type":"Dataset","description":"The two-particle cumulant $v_2\\{2\\}^2$ for Au+Au collisions at 200 and 62.4 GeV. Results are shown with like-sign combinations (LS) and...","name":"Figure 1 (left)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t2","@type":"Dataset","description":"The same as the left but for Cu+Cu collisions. The systematic errors are shown as thin lines with wide caps...","name":"Figure 1 (right)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t3","@type":"Dataset","description":"The difference of charge-independent (CI) v2{2} and like-sign (LS) $v_2\\{2\\}$ for Au+Au and Cu+Cu collisions at 200 (top panel) and...","name":"Figure 2 (up)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t4","@type":"Dataset","description":"The difference of charge-independent (CI) v2{2} and like-sign (LS) $v_2\\{2\\}$ for Au+Au and Cu+Cu collisions at 200 (top panel) and...","name":"Figure 2 (bottom)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t5","@type":"Dataset","description":"The LS and CI four-particle cumulant $v_2\\{4\\}^4$ for Au+Au collisions at 200 and 62.4 GeV for $0.15 < pT <...","name":"Figure 3 (left)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t6","@type":"Dataset","description":"The LS and CI four-particle cumulant $v_2\\{4\\}^4$ for Cu+Cu collisions at 200 and 62.4 GeV for $0.15 < p_T <...","name":"Figure 3 (right)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t7","@type":"Dataset","description":"The difference of charge-independent (CI) $v_2\\{4\\}$ and like-sign (LS) $v_2\\{4\\}$ for Au+Au collisions at 200 and 62.4 GeV vs. the...","name":"Figure 4"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t8","@type":"Dataset","description":"(Left) The difference between $v_2\\{2\\}^2$ and $v_2\\{4\\}^2$ for 200 GeV Au+Au and Cu+Cu collisions for both LS and CI combinations.","name":"Figure 5 (left)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t9","@type":"Dataset","description":"(Right) The difference between $v_2\\{2\\}^2$ and $v_2\\{4\\}^2$ for 62.4 GeV Au+Au and Cu+Cu collisions for both LS and CI combinations....","name":"Figure 5 (right)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t10","@type":"Dataset","description":"The upper limit on $\\sigma_{v_2}/\\langle v_2 \\rangle$ for 200 GeV (left) and 62.4 GeV (right) Au+Au collisions from Eq. (9)...","name":"Figure 6 (left)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t11","@type":"Dataset","description":"The upper limit on $\\sigma_{v_2}/\\langle v_2 \\rangle$ for 200 GeV (left) and 62.4 GeV (right) Au+Au collisions from Eq. (9)...","name":"Figure 6 (right)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t12","@type":"Dataset","description":"The STAR data compared to PHOBOS data [34] on $\\sigma_{v_2}/\\langle v_2 \\rangle$ with $\\delta_2$ for $\\Delta\\eta > 2$ taken to...","name":"Figure 7"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t13","@type":"Dataset","description":"The upper limit on $\\sigma_{v_2}/\\langle v_2 \\rangle$ for 200 GeV (left) and 62.4 GeV (right) Cu+Cu collisions from Eq. (9)...","name":"Figure 8 (left)"},{"@id":"https://doi.org/10.17182/hepdata.101341.v2/t14","@type":"Dataset","description":"The upper limit on $\\sigma_{v_2}/\\langle v_2 \\rangle$ for 200 GeV (left) and 62.4 GeV (right) Cu+Cu collisions from Eq. (9)...","name":"Figure 8 (right)"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins955160?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/101341"}],"inLanguage":"en","name":"Energy and system-size dependence of two- and four-particle $v_2$ measurements in heavy-ion collisions at RHIC and their implications on flow fluctuations and nonflow","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins955160?version=2","version":2}