Dilepton production in proton-proton and Pb+Pb collisions atsNN=2.76TeV Academic Article uri icon

abstract

  • We study e+e- pair production in proton-proton and central Pb+Pb collisions at sNN=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 Large Hadron Collider 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 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 semileptonic 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. 2013 American Physical Society.

published proceedings

  • Physical Review C

altmetric score

  • 0.5

author list (cited authors)

  • Linnyk, O., Cassing, W., Manninen, J., Bratkovskaya, E. L., Gossiaux, P. B., Aichelin, J., Song, T., & Ko, C. M.

citation count

  • 37

complete list of authors

  • Linnyk, O||Cassing, W||Manninen, J||Bratkovskaya, EL||Gossiaux, PB||Aichelin, J||Song, T||Ko, CM

publication date

  • January 2013