Scaling Properties of Hyperon Production in Au + Au Collisions at sqrt sNN = 200 GeV

Journal Article · Thu Jun 08 04:00:00 EDT 2006 · Physical Review Letters

OSTI ID:943587

Adams, J

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.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 943587
• Report Number(s): LBNL-1270E
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
COALESCENCE
DEGREES OF FREEDOM
HADRONS
HYPERONS
MODIFICATIONS
NUCLEONS
PHASE SPACE
PRODUCTION
PROTONS
QUARKS
RECOMBINATION
TRANSVERSE MOMENTUM