Dileptons from the nonequilibrium Quark-Gluon Plasma

Details Dileptons from the nonequilibrium Quark-Gluon Plasma Dileptons from the nonequilibrium Quark-Gluon Plasma

2010-04-18

arxiv.org/abs/1004.3069v1

Journal of Physics: Conference Series 230 (2010) 012032

Physics

Nuclear Physics

Nuclear Theory

8 pages, 8 figures, to be published in the Proceedings of the 26th Winter Workshop on `Nuclear Dynamics', Ochto Rios, Jamaica,

Scientific paper

10.1088/1742-6596/230/1/012032

According to the dynamical quasiparticle model (DQPM) -- matched to reproduce lattice QCD results in thermodynamic limit, -- the constituents of the strongly interacting quark-gluon plasma (sQGP) are massive and off-shell quasi-particles (quarks and gluons) with broad spectral functions. In order to address the electromagnetic radiation of the sQGP, we derive off-shell cross sections of $q\bar q\to\gamma^*$, $q\bar q\to\gamma^*+g$ and $qg\to\gamma^*q$($\bar q g\to\gamma^* \bar q$) reactions taking into account the effective propagators for quarks and gluons from the DQPM. Dilepton production in In+In collisions at 158 AGeV is studied by implementing these processes into the parton-hadron-string dynamics (PHSD) transport approach. The microscopic PHSD transport approach describes the full evolution of the heavy-ion collision: from the dynamics of quasi-particles in the sQGP phase (when the local energy density is above $\sim 1$ GeV/fm$^3$) through hadronization and to the following hadron interactions and off-shell propagation after the hadronization. A comparison to the data of the NA60 Collaboration shows that the low mass dilepton spectra are well described by including a collisional broadening of vector mesons, while the spectra in the intermediate mass range are dominated by off-shell quark-antiquark annihilation, quark Bremsstrahlung and gluon-Compton scattering in the nonperturbative QGP. In particular, the observed softening of the $m_T$ spectra at intermediate masses (1 GeV $\le M \le$ 3 GeV) is approximately reproduced.

Affiliated with

Also associated with

No associations

Rating

Dileptons from the nonequilibrium Quark-Gluon Plasma does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dileptons from the nonequilibrium Quark-Gluon Plasma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dileptons from the nonequilibrium Quark-Gluon Plasma will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-59119