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Direct virtual photon production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The STAR collaboration
Phys.Lett.B 770 (2017) 451-458, 2017.

Abstract
We report the direct virtual photon invariant yields in the transverse momentum ranges $1\!<\!p_{T}\!<\!3$ GeV/$c$ and $5\!<\!p_T\!<\!10$ GeV/$c$ at mid-rapidity derived from the dielectron invariant mass continuum region $0.10<M_{ee}<0.28$ GeV/$c^{2}$ for 0-80\% minimum-bias Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. A clear excess in the invariant yield compared to the number-of-binary-collisions ($N_{bin}$) scaled $p+p$ reference is observed in the $p_T$ range $1\!<\!p_{T}\!<\!3$ GeV/$c$. For $p_T\!>6$ GeV/$c$ the production follows $N_{bin}$ scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.

  • Table 1

    Data from Figure 1

    10.17182/hepdata.77495.v1/t1

    Dielectron invariant mass spectra in 1.0-1.5 GeV/c.

  • Table 2

    Data from Figure 1

    10.17182/hepdata.77495.v1/t2

    Dielectron invariant mass spectra in 1.5-2.0 GeV/c.

  • Table 3

    Data from Figure 1

    10.17182/hepdata.77495.v1/t3

    Dielectron invariant mass spectra in 2.0-2.5 GeV/c.

  • Table 4

    Data from Figure 1

    10.17182/hepdata.77495.v1/t4

    Dielectron invariant mass spectra in 2.5-3.0 GeV/c.

  • Table 5

    Data from Figure 1

    10.17182/hepdata.77495.v1/t5

    Dielectron invariant mass spectra in 5.0-6.0 GeV/c.

  • Table 6

    Data from Figure 1

    10.17182/hepdata.77495.v1/t6

    Dielectron invariant mass spectra in 6.0-7.0 GeV/c.

  • Table 7

    Data from Figure 1

    10.17182/hepdata.77495.v1/t7

    Dielectron invariant mass spectra in 7.0-8.0 GeV/c.

  • Table 8

    Data from Figure 1

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    Dielectron invariant mass spectra in 8.0-9.0 GeV/c.

  • Table 9

    Data from Figure 1

    10.17182/hepdata.77495.v1/t9

    Dielectron invariant mass spectra in 9.0-10.0 GeV/c.

  • Table 10

    Data from Figure 2 Panel a

    10.17182/hepdata.77495.v1/t10

    Dielectron invariant mass spectra with combined uncertainties, 2.0-2.5 GeV/C.

  • Table 11

    Data from Figure 2 Panel b

    10.17182/hepdata.77495.v1/t11

    Data versus fit function, 2.0-2.5 GeV/C.

  • Table 12

    Data from Figure 2 Panel c

    10.17182/hepdata.77495.v1/t12

    Data versus cocktail, 2.0-2.5 GeV/C.

  • Table 13

    Data from Figure 3

    10.17182/hepdata.77495.v1/t13

    Fraction of direct photon versus inclusive photon.

  • Table 14

    Data from Figure 4, Figure 5

    10.17182/hepdata.77495.v1/t14

    Direct virtual photon invariant yield in 60-80% centrality.

  • Table 15

    Data from Figure 4, Figure 5

    10.17182/hepdata.77495.v1/t15

    Direct virtual photon invariant yield in 40-60% centrality.

  • Table 16

    Data from Figure 4, Figure 5

    10.17182/hepdata.77495.v1/t16

    Direct virtual photon invariant yield in 0-80% centrality.

  • Table 17

    Data from Figure 4, Figure 5

    10.17182/hepdata.77495.v1/t17

    Direct virtual photon invariant yield in 20-40% centrality.

  • Table 18

    Data from Figure 4, Figure 5

    10.17182/hepdata.77495.v1/t18

    Direct virtual photon invariant yield in 0-20% centrality.

  • Table 19

    Data from Figure 6

    10.17182/hepdata.77495.v1/t19

    Direct virtual photon excess yield in 1.0-3.0GeV.

  • Table 20

    Data from Figure 6

    10.17182/hepdata.77495.v1/t20

    Direct virtual photon excess yield in 1.5-3.0GeV.

  • Table 21

    Data from Figure 6

    10.17182/hepdata.77495.v1/t21

    Direct virtual photon total yield in 1.0-3.0GeV.

  • Table 22

    Data from Figure 6

    10.17182/hepdata.77495.v1/t22

    Direct virtual photon total yield in 1.5-3.0GeV.

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