Dilepton production from a nonequilibrium quark - gluon plasma in ultrarelativistic nucleus-nucleus collisions
Nov, 199061 pages
Published in:
- Phys.Rev.D 43 (1991) 2871-2891
Report number:
- MIT-CTP-1913
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Abstract: (APS)
Dilepton production from a nonequilibrium quark-gluon plasma produced in ultrarelativistic nucleus-nucleus collisions is studied, based on the flux-tube model which has been formulated in terms of a model relativistic Boltzmann-Vlasov equation with a boost-invariant particle source term. This model kinetic equation is solved with the collision term in the relaxation-time approximation. In the collisionless limit, the solution of the kinetic equation becomes oscillatory, indicating the spontaneous excitation of the plasma oscillation. We study how such a nonequilibrium evolution of the system is reflected in the dilepton spectrum. It is shown that the dileptons emitted during such a nonequilibrium stage of matter evolution does not necessarily lead to a spectrum which interpolates smoothly the spectrum from thermal emission and that from the Drell-Yan mechanism. Our results show, on the contrary, that the dilepton spectrum is softened significantly in the absence of thermalization. MT scaling, which is expected in scaling one-dimensional hydrodynamic evolution, is also broken due to the anisotropy in the phase-space distribution of quarks.- nucleus nucleus: nuclear reaction
- lepton: pair production
- pair production: lepton
- quark gluon: plasma
- plasma: oscillation
- flux tube
- thermodynamics
- scaling
- hydrodynamics
- Boltzmann-Vlasov equation
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