Journal article
Authors list: Song, Taesoo; Cassing, Wolfgang; Moreau, Pierre; Bratkovskaya, Elena
Publication year: 2018
Journal: Physical Review C
Volume number: 97
Issue number: 6
ISSN: 2469-9985
eISSN: 2469-9993
Open access status: Green
DOI Link: https://doi.org/10.1103/PhysRevC.97.064907
Publisher: American Physical Society
Abstract:
Dileptons are considered as one of the cleanest signals of the quark-gluon plasma (QGP); however, the QGP radiation is masked by many background sources from either hadronic decays or semileptonic decays from correlated charm pairs. In this study, we investigate the relative contribution of these channels in heavy-ion collisions from root S-NN = 8 GeV to 5 TeV with a focus on the competition between the thermal QGP radiation and the semileptonic decays from correlated D-meson pairs. As a tool, we employ the parton-hadron-string dynamics (PHSD) transport approach to study dilepton spectra in Pb + Pb (Au + Au) collisions in a wide energy range, incorporating for the first time a fully microscopic treatment of the charm dynamics and their semileptonic decays. We find that the dileptons from correlated D-meson decays dominate the thermal radiation from the QGP in central Pb Pb collisions at the intermediate masses (1.2 GeV < M < 3 GeV) for root S-NN > 40 GeV, while for root S-NN = 8 to 20 GeV the contribution from D, (D) over bar decays to the intermediate mass dilepton spectra is subleading such that one should observe a rather clear signal from the QGP radiation. We furthermore study the PT spectra and the R-AA (PT) of single electrons at different energies as well as the excitation function of the inverse slope of the m(T) spectra for intermediate-mass dileptons from the QGP and from charm decays. We find moderate but characteristic changes in the inverse slope parameter for root S-NN > 20 GeV which can be observed experimentally in high statistics data. Additionally, we provide detailed predictions for dilepton spectra from Pb + Pb collisions at root S-NN = 5.02 TeV.
Citation Styles
Harvard Citation style: Song, T., Cassing, W., Moreau, P. and Bratkovskaya, E. (2018) Open charm and dileptons from relativistic heavy-ion collisions, Physical Review C, 97(6), Article 064907. https://doi.org/10.1103/PhysRevC.97.064907
APA Citation style: Song, T., Cassing, W., Moreau, P., & Bratkovskaya, E. (2018). Open charm and dileptons from relativistic heavy-ion collisions. Physical Review C. 97(6), Article 064907. https://doi.org/10.1103/PhysRevC.97.064907
Keywords
ALICE; PB-PB COLLISIONS; Photons; PROTON
