Elliptic flow from two- and four-particle correlations in Au + Au collisions at s(NN)**(1/2) = 130-GeV.

The STAR collaboration
Phys.Rev.C 66 (2002) 034904, 2002.

Abstract (data abstract)
Elliptic flow holds much promise for studying the early-time thermalization attained in ultrarelativistic nuclear collisions. Flow measurements also provide a means of distinguishing between hydrodynamic models and calculations which approach the low density (dilute gas) limit. Among the effects that can complicate the interpretation of elliptic flow measurements are azimuthal correlations that are unrelated to the reaction plane ( nonflow correlations). Using data for $Au+Au$ collisions at $\sqrt{s_{NN}}=130$ GeV from the STAR time projection chamber, it is found that four-particle correlation analyses can reliably separate flow and nonflow correlation signals. The latter account for on average about $15\%$ of the observed second-harmonic azimuthal correlation, with the largest relative contribution for the most peripheral and the most central collisions. The results are also corrected for the effect of flow variations within centrality bins. This effect is negligible for all but the most central bin, where the correction to the elliptic flow is about a factor of 2. A simple new method for twoparticle flow analysis based on scalar products is described. An analysis based on the distribution of the magnitude of the flow vector is also described.

  • Table 1

    Data from Fig. 2

    10.17182/hepdata.98926.v1/t1

    Correlation between the event plane angles determined from pairs of subevents partitioned randomly (circles), partitioned with opposite signs of pseudorapidity...

  • Table 2

    Data from Fig. 3

    10.17182/hepdata.98926.v1/t2

    The event plane resolution for full events as a function of centrality, using randomly partitioned subevents with (circles) and without...

  • Table 3

    Data from Fig. 4

    10.17182/hepdata.98926.v1/t3

    Elliptic flow signal $v_{2}$ as a function of centrality, from study of the correlation between particle pairs consisting of randomly...

  • Table 4a

    Data from Fig. 5, upper panel

    10.17182/hepdata.98926.v1/t4

    The upper panel shows $v_{2}$ vs centrality using the conventional method, where the circles and triangles represent $v_{2}$ with and...

  • Table 4b

    Data from Fig. 5, lower panel

    10.17182/hepdata.98926.v1/t5

    The upper panel shows $v_{2}$ vs centrality using the conventional method, where the circles and triangles represent $v_{2}$ with and...

  • Table 5a

    Data from Fig. 6, upper panel

    10.17182/hepdata.98926.v1/t6

    The upper panel presents $v_{2}$ vs centrality from the scalar product method (triangles) and the conventional random subevent method (circles)....

  • Table 5b

    Data from Fig. 6, lower panel

    10.17182/hepdata.98926.v1/t7

    The upper panel presents $v_{2}$ vs centrality from the scalar product method (triangles) and the conventional random subevent method (circles)....

  • Table 6

    Data from Fig. 8

    10.17182/hepdata.98926.v1/t8

    Elliptic flow as determined from the fits to the $q$ distributions in different centrality bins. The circles are from the...

  • Table 7

    Data from Fig. 13

    10.17182/hepdata.98926.v1/t9

    Measured elliptic flow vs centrality for $Au+Au$ at $\sqrt{s_{NN}}=130$ GeV. The circles show the conventional $v_{2}$ with estimated systematic uncertainty...

  • Table 8a

    Data from Fig. 14, centrality 53%-77%

    10.17182/hepdata.98926.v1/t10

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8b

    Data from Fig. 14, centrality 41%-53%

    10.17182/hepdata.98926.v1/t11

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8c

    Data from Fig. 14, centrality 31%-41%

    10.17182/hepdata.98926.v1/t12

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8d

    Data from Fig. 14, centrality 24%-31%

    10.17182/hepdata.98926.v1/t13

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8e

    Data from Fig. 14, centrality 16%-24%

    10.17182/hepdata.98926.v1/t14

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8f

    Data from Fig. 14, centrality 10%-16%

    10.17182/hepdata.98926.v1/t15

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8g

    Data from Fig. 14, centrality 5%-10%

    10.17182/hepdata.98926.v1/t16

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 8h

    Data from Fig. 14, centrality 0%-5%

    10.17182/hepdata.98926.v1/t17

    Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9a

    Data from Fig. 15, centrality 53%-77%

    10.17182/hepdata.98926.v1/t18

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9b

    Data from Fig. 15, centrality 41%-53%

    10.17182/hepdata.98926.v1/t19

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9c

    Data from Fig. 15, centrality 31%-41%

    10.17182/hepdata.98926.v1/t20

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9d

    Data from Fig. 15, centrality 24%-31%

    10.17182/hepdata.98926.v1/t21

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9e

    Data from Fig. 15, centrality 16%-24%

    10.17182/hepdata.98926.v1/t22

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9f

    Data from Fig. 15, centrality 10%-16%

    10.17182/hepdata.98926.v1/t23

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9g

    Data from Fig. 15, centrality 5%-10%

    10.17182/hepdata.98926.v1/t24

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 9h

    Data from Fig. 15, centrality 0%-5%

    10.17182/hepdata.98926.v1/t25

    Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant...

  • Table 10

    Data from Fig. 16

    10.17182/hepdata.98926.v1/t26

    Elliptic flow vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), from quarter events (crosses), and...

  • Table 11

    Data from Fig. 17

    10.17182/hepdata.98926.v1/t27

    Elliptic flow vs transverse momentum from the conventional method (circles), from the second-order cumulant method (triangles), from quarter events (crosses),...

  • Table 12

    Data from Fig. 18

    10.17182/hepdata.98926.v1/t28

    The ratio of $v_{2}$ from the fourth-order cumulant divided by $v_{2}$, from the conventional method as a function of $p_{t}$,...

  • Table 13

    Data from Fig. 19

    10.17182/hepdata.98926.v1/t29

    The ratio of $v_{2}$ from quarter events divided by the conventional $v_{2}$ as a function of $p_{t}$. In both cases,...

  • Table 14

    Data from Fig. 22

    10.17182/hepdata.98926.v1/t30

    $v_{2}/\varepsilon$ as a function of charged particle density in $Au+Au$ collisions. Data are from E877 at the AGS (squares), NA49...

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