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Impact of hadron contamination in dielectron spectrum

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-HadronContaminationInMassSpectrum.eps
Figure image (.pdf)
2018-Aug-08-HadronContaminationInMassSpectrum.pdf
Figure Caption

Invariant-mass distribution of correlated electron-hadron and hadron-hadron pairs, where hadrons are wrongly identified as electrons, in comparison with the invariant-mass spectrum of all pairs (dielectron signal pairs and `contaminated' pairs) obtained from MC simulations. In the bottom panel, the ratio between the invariant-mass spectrum of electron-hadron and hadron-hadron pairs to that of all pairs is shown. Boxes represent the systematic uncertainties on the hadron contamination. 

Detail description

Invariant-mass distribution of correlated electron-hadron and hadron-hadron pairs, where hadrons are wrongly identified as electrons, in comparison with the invariant-mass spectrum of all pairs (dielectron signal pairs and `contaminated' pairs) obtained from MC simulations. In the bottom panel, the ratio between the invariant-mass spectrum of electron-hadron and hadron-hadron pairs to that of all pairs is shown. Boxes represent the systematic uncertainties on the hadron contamination.