Strange anti-particle to particle ratios at mid-rapidity in {radical} {ovr s} {sub NN} = 130 GeV Au+Au collisions.

Journal Article · Thu Aug 14 04:00:00 EDT 2003 · Phys. Lett. B

DOI:https://doi.org/10.1016/j.physletb.2003.06.039· OSTI ID:961170

Adams, J; Adler, C; Ahammed, Z; Allgower, C; Amonett, J; Cadman, R V; Krueger, K; Spinka, H M; Underwood, D G

Values of the ratios in the mid-rapidity yields of anti-{Lambda}/{Lambda} = 0.71 {+-} 0.01(stat.) {+-} 0.04(sys.), anti-{Xi}{sup +}{Xi}{sup -} = 0.83 {+-} 0.04(stat.) {+-} 0.05(sys.), anti-{Omega}{sup +}/{Omega}{sup -} = 0.95 {+-} 0.15(stat.) {+-} 0.05(sys.) and {Kappa}{sup +}/{Kappa}{sup -} 1.092 {+-} 0.023(combined) were obtained in central {radical}{ovr s}{sub NN} = 130 GeV Au+Au collisions using the STAR detector. The ratios indicate that a fraction of the net-baryon number from the initial system is present in the excess of hyperons over anti-hyperons at mid-rapidity. The trend in the progression of the baryon ratios, with increasing strange quark content, is similar to that observed in heavy-ion collisions at lower energies. The value of these ratios may be related to the charged kaon ratio in the framework of simple quark-counting and thermal models.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF; FOR
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 961170
• Report Number(s): ANL-HEP-PR-02-111
• Journal Information: Phys. Lett. B, Journal Name: Phys. Lett. B Journal Issue: 3-4 ; Aug. 14, 2003 Vol. 567; ISSN PYLBAJ; ISSN 0370-2693
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AUGMENTATION
BARYONS
COLLISIONS
HYPERONS
KAONS
PARTICLE RAPIDITY
PARTICLES
QUARKS
YIELDS