Dielectron production in central Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02TeV
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Le résumé fourni par la source
The first measurement of the e$^+$e$^−$ pair production at midrapidity and low invariant mass in central Pb-Pb collisions at $\sqrt{s_{NN}}$=5.02TeV at the Large Hadron Collider is presented. The yield of e$^+$e$^−$ pairs is compared with a cocktail of expected hadronic decay contributions in the invariant mass (m$_{ee}$) and pair transverse momentum ($p_{T,ee}$) ranges m$_{ee}$ < 3.5 GeV/c$^2$ and p$_{T,ee}$ <8 GeV/c. For 0.18 < m$_{ee}$ < 0.5 GeV/c$^2$ the ratio of data to the cocktail of hadronic contributions amounts to 1.40±0.11(stat.)±0.23(syst.)±0.16(cocktail) and 1.42±0.11(stat.)±0.23(syst.)−0.29+0.24(cocktail), including or not including medium effects in the estimation of the heavy-flavor background, respectively. It is consistent with predictions from two different models for an additional contribution of thermal e$^+$e$^−$ pairs from the hadronic and partonic phases. In the intermediate-mass range (1.2 < m$_{ee}$ < 2.6 GeV/c$^2$), the pair transverse impact parameter of the e$^+$e$^−$ pairs (DCAee, where “DCA” denotes “distance of closest approach”) is used for the first time in Pb-Pb collisions to separate displaced dielectrons from heavy-flavor hadron decays from a possible (thermal) contribution produced at the interaction point. The data are consistent with a suppression of e$^+$e$^−$ pairs from $c\bar{c}$ and an additional prompt component. Finally, the first direct-photon measurement in the 10% most central Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02TeV is reported via the study of virtual direct photons in the transverse momentum range 1 < p$_T$ < 5 GeV/c. A model including prompt photons, as well as photons from the preequilibrium and fluid-dynamic phases, can reproduce the result, while being at the upper edge of the data uncertainties.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.