Knudsen number, ideal hydrodynamic limit for elliptic flow, and QGP viscosity in {radical}(s{sub NN})=62 and 200 GeV Cu+Cu/Au+Au collisions

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.047901· OSTI ID:21421330

Chaudhuri, A K ^[1]

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1. Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064 (India)

Taking into account entropy generation during evolution of a viscous fluid, we have estimated the inverse Knudsen number, the ideal hydrodynamic limit for elliptic flow, and the quark-gluon plasma viscosity to entropy ratio in {radical}(s{sub NN})=62 and 200 GeV Cu+Cu/Au+Au collisions. The viscosity to entropy ratio is estimated as {eta}/s=0.17{+-}0.10{+-}0.20, where the first error is statistical, the second one is systematic. In a central Au+Au collision, the inverse Knudsen number is {approx_equal}2.80{+-}1.63, which is presumably too small for complete equilibration. In peripheral collisions it is even less. The ideal hydrodynamic limit for elliptic flow is {approx}40% more than the experimental flow in a central collision.

• OSTI ID: 21421330
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
BASIC INTERACTIONS
COLLISIONS
COPPER
ELEMENTS
ENERGY RANGE
ENTROPY
FLUID FLOW
GAS FLOW
GEV RANGE
GOLD
HYDRODYNAMIC MODEL
INTERACTIONS
KNUDSEN FLOW
MATHEMATICAL MODELS
MATTER
METALS
PARTICLE MODELS
PERIPHERAL COLLISIONS
PHYSICAL PROPERTIES
QUARK MATTER
STATISTICAL MODELS
STRONG INTERACTIONS
THERMODYNAMIC MODEL
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS