Scaling Properties of Hyperon Production in Au + Au Collisions at sqrt sNN = 200 GeV [electronic resource].

Published:: Berkeley, Calif. : Lawrence Berkeley National Laboratory. Nuclear Science Division, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 7 : digital, PDF file
Additional Creators:: Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory. Nuclear Science Division, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We present the scaling properties of Lambda, Xi, and their anti-particles produced at mid-rapidity in Au+Au collisions at RHIC at psNN = 200 GeV. The yield of multi-strange baryons per participant nucleon increases from peripheral to central collisions more rapidly than the Lambda yield, which appears to correspond to an increasing strange quark density of matter produced. The value of the strange phase space occupancy factor gamma s, obtained from a thermal model fit to the data, approaches unity for the most central collisions. We also show that the nuclear modification factors, RCP, of Lambda and Xi are consistent with each other and with that of protons in the transverse momentum range2.0< pT< 5.0 GeV/c. This scaling behaviour is consistent with a scenario of hadron formation from constituent quark degrees of freedom through quark recombination or coalescence.

Report Numbers:

E 1.99:lbnl-1270e
lbnl-1270e

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Note:

Published through SciTech Connect.
06/08/2006.
"lbnl-1270e"
Physical Review Letters 98 ISSN 0031-9007; PRLTAO FT
Adams, J.

Funding Information:

DE-AC02-05CH11231

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