Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 2013

Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV

O. Linnyk
  • Function : Author
W. Cassing
  • Function : Author
J. Manninen
  • Function : Author
E. L. Bratkovskaya
  • Function : Author
Pol-Bernard Gossiaux
Joerg Aichelin
T. Song
  • Function : Author
C. M. Ko
  • Function : Author

Abstract

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.

Dates and versions

in2p3-00723332 , version 1 (09-08-2012)

Identifiers

Cite

O. Linnyk, W. Cassing, J. Manninen, E. L. Bratkovskaya, Pol-Bernard Gossiaux, et al.. Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV. Physical Review C, 2013, 87, pp.014905. ⟨10.1103/PhysRevC.87.014905⟩. ⟨in2p3-00723332⟩
38 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More