Transverse Flow Effects in Dilepton Emission

Kajantie, K.; Kataja, M.; McLerran, Larry D.; Ruuskanen, P.V.

doi:10.1103/PhysRevD.34.811

Transverse Flow Effects in Dilepton Emission

K. Kajantie
(
- Helsinki, Academy of Finland and
- Helsinki U.
)
,
M. Kataja
(
- Jyvaskyla U.
)
,
Larry D. McLerran
(
- Fermilab
)
,
P.V. Ruuskanen
(
- Jyvaskyla U.
)

Jan, 1986

39 pages

Published in:

Phys.Rev.D 34 (1986) 811

DOI:

10.1103/PhysRevD.34.811

Report number:

HU-TFT-86-6

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Abstract: (APS)

Dilepton emission from expanding QCD matter formed in ultrarelativistic nuclear collisions is computed. The energy density and the velocity field of the expanding matter are computed numerically with a (1+3)-dimensional numerical code which assumes cylindrical invariance in the transverse and boost invariance in the longitudinal direction. Effects of transverse flow are studied and shown to be important in the region of pair mass M≲1.2 GeV. The existence of transverse flow results in the persistent appearance of the ρ peak in the M distribution at fixed transverse mass MT for large MT. The initial temperature Ti and the thermalization time τi of the hydrodynamical flow are related to the associated pion multiplicity dN/dy and the dilepton emission rate at M>1.5 GeV.

NUCLEUS NUCLEUS: NUCLEAR REACTION
RELATIVISTIC
FINAL STATE: DILEPTON
DILEPTON: FINAL STATE
NUCLEAR REACTION: CENTRAL REGION
QUARK GLUON: PLASMA
THERMODYNAMICS: CRITICAL PHENOMENA
MATTER: HADRONIC
ENERGY: DENSITY
VELOCITY

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