Kaon and pionproduction in central Au+Au collisions at sqrt sNN = 62.4 GeV

Journal Article · Fri Mar 05 04:00:00 EST 2010 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2010.02.078· OSTI ID:985520

Arsene, I C; Videbaek, F

Invariant p{sub T} spectra and rapidity densities covering a large rapidity range (-0.1 < y < 3.5) are presented for {pi}{sup {+-}} and K{sup {+-}} mesons from central Au + Au collisions at {radical}S{sub NN} = 62.4 GeV. The mid-rapidity yields of meson particles relative to their anti-particles are found to be close to unity ({pi}{sup -}/{pi}{sup +} {approx} 1, K{sup -}/K{sup +} {approx} 0.85) while the anti-proton to proton ratio is {bar p}/p {approx} 0.49. The rapidity dependence of the {pi}{sup -}/{pi}{sup +} ratio is consistent with a small increase towards forward rapidities while the K{sup -}/K{sup +} and {bar p}/p ratios show a steep decrease to {approx}0.3 for kaons and 0.022 for protons at y {approx} 3. It is observed that the kaon production relative to its own anti-particle as well as to pion production in wide rapidity and energy ranges shows an apparent universal behavior consistent with the baryo-chemical potential, as deduced from the {bar p}/p ratio, being the driving parameter.

• Research Organization: Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 985520
• Report Number(s): BNL--93622-2010-JA; KB0201021
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Journal Issue: 1 Vol. 687; ISSN 0370-2693
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ENERGY RANGE
Heavy ion collisons
KAONS
MESONS
PARTICLE RAPIDITY
PIONS
PRODUCTION
PROTONS
SPECTRA
baryon chemical potential
relativistic heavy ion collider
strangeness enhancement