Dilepton production from a nonequilibrium quark-gluon plasma in ultrarelativistic nucleus-nucleus collisions

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.43.2871· OSTI ID:5664313

Asakawa, M ^[1]; Matsui, T ^[2]

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1. Center for Theoretical Physics, Laboratory for Nuclear Science Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA) Department of Physics, Faculty of Science, University of Tokyo, Tokyo 113, (Japan)
2. Center for Theoretical Physics, Laboratory for Nuclear Science, Cambridge, Massachusetts 02139 (USA) Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)

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. {ital M}{sub {ital T}} scaling, which is expected in scaling one-dimensional hydrodynamic evolution, is also broken due to the anisotropy in the phase-space distribution of quarks.

• DOE Contract Number: AC02-76ER03069
• OSTI ID: 5664313
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 43:9; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOLTZMANN-VLASOV EQUATION
CHARGED-PARTICLE REACTIONS
DIFFERENTIAL EQUATIONS
DRELL MODEL
ELECTRODYNAMICS
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
FERMIONS
FIELD THEORIES
HEAVY ION REACTIONS
HYDRODYNAMIC MODEL
INTERACTIONS
LEPTONS
MASS SPECTRA
MATHEMATICAL MODELS
MATHEMATICAL SPACE
MATTER
NUCLEAR REACTIONS
PAIR PRODUCTION
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHASE SPACE
PLASMA WAVES
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
QUARK MATTER
QUARK-ANTIQUARK INTERACTIONS
RELATIVISTIC RANGE
RELAXATION TIME
SPACE
SPACE-TIME
SPECTRA
STATISTICAL MODELS
THERMODYNAMIC MODEL