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Dilepton radiation by vector mesons and off-shell partons in the hot and dense medium
- Source :
- AIP Conf. Proc. 1257, 700 (2010)
- Publication Year :
- 2010
-
Abstract
- 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+qbar->gamma*, q+qbar->gamma*+glue and q+glue->gamma*+q(qbar+glue->gamma*qbar) 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 ~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 mT spectra at intermediate masses (1 GeV < M < 3 GeV) is approximately reproduced.<br />Comment: Talk given at the XIII International Conference on Hadron Spectroscopy (HADRON 09), November 29 - December 4, 2009, Tallahassee, Florida; two references added in version 2
- Subjects :
- Nuclear Theory
Subjects
Details
- Database :
- arXiv
- Journal :
- AIP Conf. Proc. 1257, 700 (2010)
- Publication Type :
- Report
- Accession number :
- edsarx.1001.3858
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1063/1.3483424