Measurement of dielectron production in central Pb-Pb collisions at sNN=2.76TeV

The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at √ sNN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < mee < 3.5 GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15 < mee < 0.7 GeV/c2, where an excess of dielectrons is observed in other experiments, and its value is 1.40 ± 0.28 (stat.) ± 0.08 (syst.) ± 0.27 (cocktail). The dielectron spectrum measured in the invariant mass range 0 < mee < 1 GeV/c2 is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened ρ0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < mee < 0.3 GeV/c2 and in the transverse-momentum intervals 1 < pT,ee < 2 GeV/c and 2 < pT,ee < 4 GeV/c. The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties.

• Publication year

  2018

• Venue

  Physical Review C

• Publication date

  2018-07-02

• Fields of study

  Physics

• Identifiers
  DOI 10.1103/PhysRevC.99.024002arXiv 1807.00923
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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