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R_{gamma}: real vs. virtual photons

Figure Information
Scope: PWG
PWG-DQ (Dileptons and Quarkonia)
Energy
2.76 TeV
System
Pb-Pb
Figure Group
Measurement of dielectron production in central Pb--Pb collisions at $\mathbf{\sqrt{{\textit{s}}_{\mathrm{NN}}}}$ = 2.76 TeV
Figure Image
Figure image (.eps)
2018-Aug-08-RGammaComparison.eps
Figure image (.pdf)
2018-Aug-08-RGammaComparison.pdf
Figure Caption

Comparison between the direct photon ratio $R_{\gamma^{(*)}}=1+\gamma^{(*)}_{\mathrm{dir}}/\gamma^{(*)}_{\mathrm{decay}}$ measured using virtual photons in the centrality range 0$-$10$\%$ to that obtained using real photons in the centrality range 0$-$20$\%$ and several theoretical model calculations (see text for references). The real photon measurement is taken from \cite{ALICEDirectPhotons}. The statistical and systematic uncertainties of the data are represented by vertical bars and boxes.

Detail description

Comparison between the direct photon ratio $R_{\gamma^{(*)}}=1+\gamma^{(*)}_{\mathrm{dir}}/\gamma^{(*)}_{\mathrm{decay}}$ measured using virtual photons in the centrality range 0$-$10$\%$ to that obtained using real photons in the centrality range 0$-$20$\%$ and several theoretical model calculations (see text for references). The real photon measurement is taken from \cite{ALICEDirectPhotons}. The statistical and systematic uncertainties of the data are represented by vertical bars and boxes.