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Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV
Linnyk O., Cassing W., Manninen J., Bratkovskaya E.L., Gossiaux P.-B. et al
Physical Review C 87 (2013) 014905 - http://hal.in2p3.fr/in2p3-00723332
Physique/Physique Nucléaire Expérimentale
Physique/Physique Nucléaire Théorique
Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV
O. Linnyk, W. Cassing, J. Manninen, E. L. Bratkovskaya, Pol-Bernard Gossiaux ()1, Jörg Aichelin1, T. Song, C. M. Ko
1 :  SUBATECH - Laboratoire SUBATECH Nantes
CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes
4, rue Alfred Kastler - 44070 Nantes Cedex 03
We study e^+e^- pair production in proton-proton and central Pb+Pb collisions at sqrt(s_NN)=2.76 TeV within two models: an extended statistical hadronization model (SHM) and the Parton-Hadron-String Dynamics (PHSD) transport approach. We find that the PHSD calculations roughly agree with the dilepton spectrum from hadronic sources with the 'cocktail' estimates from the statistical hadronization model matched to available data at LHC energies. The dynamical simulations within the PHSD show a moderate increase of the low mass dilepton yield essentially due to the in-medium modification of the rho-meson. Furthermore, pronounced traces of the partonic degrees of freedom are found in the PHSD results in the intermediate mass regime. The dilepton production from the strongly interacting quark-gluon plasma (sQGP) exceeds that from the semi-leptonic decays of open charm and bottom mesons. Additionally, we observe that a transverse momentum cut of 1 GeV/c further suppresses the relative contribution of the heavy meson decays to the dilepton yield, such that the sQGP radiation strongly dominates the spectrum for masses from 1 to 3 GeV, allowing a closer look at the electromagnetic emissivity of the partonic plasma in the early phase of Pb+Pb collisions.

Articles dans des revues avec comité de lecture
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)

16 pages, 10 figures
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