Measurement of dielectron production in central Pb-Pb collisions at root S-NN=2.76 TeV
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Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE
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Abstract
The first measurement of dielectron (e(+)e(-)) production in central
(0-10\%) Pb-Pb collisions at root S-NN = 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
< m(ee) < 3.5 GeV/c(2). The ratio of data and the cocktail of hadronic
contributions without vacuum rho(0) is measured in the invariant-mass
range 0.15 < m(ee) < 0.7 GeV/c(2), where an excess of dielectrons is
observed in otheer 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 < m(ee) < 1 GeV/c(2) 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 rho(0) meson. The fraction of direct virtual
photons over inclusive virtual photons is extracted for dielectron pairs
with invariant mass 0.1 < m(ee) < 0.3 GeV/c(2) and in the
transverse-momentum intervals 1 <( )p(T,ee) < 2 GeV/c and 2 < p(T,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.... Show more Show less