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Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV (CROSBI ID 261857)

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(ALICE Collaboration) Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... et al. Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV // Physical review. C, 99 (2019), 2; 024002, 23. doi: 10.1103/physrevc.99.024002

Podaci o odgovornosti

Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Simatović, Goran ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zou, S.

ALICE Collaboration

engleski

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

The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at sNN=2.76TeV 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<3.5GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range mee<0.15, 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 mee<0, 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 mee<0.1, 0.3>GeV/c2 and in the transverse-momentum intervals 1<pT, ee<2GeV/c and 2<pT, ee<4GeV/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.

photon: virtual ; photon: direct production ; heavy ion: scattering ; hadron: decay ; Brookhaven RHIC Coll ; transverse momentum ; CERN LHC Coll ; thermal ; ALICE ; meson

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Podaci o izdanju

99 (2)

2019.

024002

23

objavljeno

2469-9985

2469-9993

10.1103/physrevc.99.024002

Povezanost rada

Fizika

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