Saturation of elliptic flow and the transport opacity of the gluon plasma at RHIC - INSPIRE

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Saturation of elliptic flow and the transport opacity of the gluon plasma at RHIC

Denes Molnar
(
- Columbia U. and
- Budapest, RMKI
)
,
Miklos Gyulassy
(
- Columbia U. and
- Budapest, RMKI and
- Collegium Budapest
)

Apr, 2001

12 pages

Published in:

Nucl.Phys.A 697 (2002) 495-520,
Nucl.Phys.A 703 (2002) 893-894 (erratum)

e-Print:

nucl-th/0104073 [nucl-th]

DOI:

10.1016/S0375-9474(01)01224-6,
10.1016/S0375-9474(02)00859-X (erratum)

Report number:

CU-TP-1016

View in:

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Abstract:

Differential elliptic flow and particle spectra are calculated taking into account the finite transport opacity of the gluon plasma produced in Au+Au at Ecm ~ 130 A GeV at RHIC. Covariant numerical solutions of the ultrarelativistic Boltzmann equation are obtained using the MPC parton cascade technique. For typical pQCD (~3 mb) elastic cross sections, extreme initial gluon densities, dN/deta ~ 15000, are required to reproduce the elliptic flow saturation pattern reported by STAR. However, we show that the solutions depend mainly on the transport opacity,

\chi=\int dz \sigma_t\rho_g

, and thus the data can also be reproduced with dN/deta ~ 1000, but with extreme elastic parton cross sections, \~45 mb. We demonstrate that the spectra and elliptic flow are dominated by numerical artifacts unless parton subdivisions ~100-1000 are applied to retain Lorentz covariance for RHIC initial conditions.

Note:

Long overdue update with final published version + erratum (13 pages, 17 EPS figs) Report-no: CU-TP-1016 Journal-ref: Nucl. Phys. A697 (2002) 495-520: Erratum in Nucl. Phys. A703 (2002) 893-894

12.38.Mh
24.85.+p
25.75.-q
scattering: heavy ion
gold
gluon: particle flow
angular dependence
transverse momentum dependence
hadron: particle flow
negative particle

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