Measurements of transverse energy distributions in Au + Au collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.C 70 (2004) 054907, 2004.

Abstract (data abstract)
Transverse energy ($E_{T}$) distributions have been measured for Au+Au collisions at $sqrt{s_{NN}}$=200 GeV by the STAR collaboration at RHIC. $E_{T}$ is constructed from its hadronic and electromagnetic components, which have been measured separately. $E_{T}$ production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of $E_{T}$ per charged particle agrees well with measurements at lower collision energy, indicating that the growth in $E_{T}$ for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total $E_{T}$ is consistent with a final state dominated by mesons and independent of centrality.

  • Figure 1

    Data from Figure 1

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    Typical MIP spectrum. The hits correspond to isolated tracks with p > 1.25 GeV/c which project to EMC towers. The...

  • Figure 2

    Data from Figure 2

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    $p/E_{tower}$ spectrum for electron candidates, selected through $dE/dx$ from the TPC, with 1.5 < p < 5.0 GeV/c. A well...

  • Figure 3 up

    Data from Figure 3 up

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    Upper plot: points are measured $p/E_{tower}$ electron peak position as a function of the distance to the center of the...

  • Figure 3 down

    Data from Figure 3 down

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    Upper plot: points are measured $p/E_{tower}$ electron peak position as a function of the distance to the center of the...

  • Figure 4

    Data from Figure 4

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    Mean values from GEANT simulations of the energy deposited in the EMC by various hadronic species as a function of...

  • Figure 5

    Data from Figure 5

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    Spatial profiles of energy deposition in the EMC as a function of distance ($d$) from the hit point to the...

  • Figure 6

    Data from Figure 6

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    Event-by-event ratio of the reconstructed electromagnetic energy for the most central events. The solid line is a gaussian fit.

  • Figure 7

    Data from Figure 7

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    Total Transverse Energy for 0 < $\eta$ < 1. The minimum bias distribution is presented as well as the distributions...

  • Figure 8 up

    Data from Figure 8 up

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    ⟨$dE_{T}/d\eta|_{\eta=0.5}$⟩ per $N_{part}$ pair vs. $N_{part}$. Upper panel: $N_{part}$ is obtained from Monte Carlo Glauber calculations. The lines show calculations...

  • Figure 8 down

    Data from Figure 8 down

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    ⟨$dE_{T}/d\eta|_{\eta=0.5}$⟩ per $N_{part}$ pair vs. $N_{part}$. Upper panel: $N_{part}$ is obtained from Monte Carlo Glauber calculations. The lines show calculations...

  • Figure 9

    Data from Figure 9

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    $dE_{T}/dy$ (see text for details) per $N_{part}$ pair vs $sqrt{s_{NN}}$ for central events. In this figure $dE_{T}/dy/(0.5N_{part})$ is seen to...

  • Figure 10 up

    Data from Figure 10 up

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    Upper panel - ⟨$dE_{T}/d\eta⟩/⟨dN_{ch}/d\eta$⟩ vs $N_{part}$. Predictions from HIJING simulations for Au+Au at 200 GeV are presented. Results from WA98...

  • Figure 10 down

    Data from Figure 10 down

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    Upper panel - ⟨$dE_{T}/d\eta⟩/⟨dN_{ch}/d\eta$⟩ vs $N_{part}$. Predictions from HIJING simulations for Au+Au at 200 GeV are presented. Results from WA98...

  • Figure 11

    Data from Figure 11

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    ⟨$dE_{T}/d\eta⟩/⟨dN_{ch}/d\eta$⟩ vs $sqrt{s_{NN}}$ for central events. The error bar in the STAR point corresponds to the systematic uncertaintiy. A constant...

  • Figure 12

    Data from Figure 12

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    Energy dependence of the electromagnetic fraction of the transverse energy for a number of systems spanning SPS to RHIC energy...

  • Figure 13

    Data from Figure 13

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    Participant number dependence of the electromagnetic fraction of the total transverse energy. The results are consistent with HIJING within errors...

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