Pion, kaon, proton and anti-proton transverse momentum distributions from p+p and d+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.

Journal Article · Thu Jun 09 04:00:00 EDT 2005 · Phys. Rev. Lett.

OSTI ID:961445

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

Identified mid-rapidity particle spectra of {pi}{sup {+-}}, K{sup {+-}} , and inlMMLBox from 200 GeV p + p and d +Au collisions are reported. A time-of-flight detector based on multi-gap resistive plate chamber technology is used for particle identification. The particle-species dependence of the Cronin effect is observed to be significantly smaller than that at lower energies. The ratio of the nuclear modification factor ( R d Au ) between protons ( inlMMLBox ) and charged hadrons ( h ) in the transverse momentum range 1.2< p T <3.0 GeV/ c is measured to be 1.19{+-}0.05(stat){+-}0.03(syst) in minimum-bias collisions and shows little centrality dependence. The yield ratio of inlMMLBox in minimum-bias d +Au collisions is found to be a factor of 2 lower than that in Au+Au collisions, indicating that the Cronin effect alone is not enough to account for the relative baryon enhancement observed in heavy ion collisions at RHIC.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF; FOR
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 961445
• Report Number(s): ANL-HEP-PR-03-82
• Journal Information: Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: 1-2 ; Jun. 9, 2005 Vol. 616; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
BARYONS
BROOKHAVEN RHIC
CHARGED PARTICLES
COLLISIONS
DEUTERON REACTIONS
GEV RANGE 100-1000
GOLD 197 REACTIONS
GOLD 197 TARGET
HADRONS
HEAVY IONS
MODIFICATIONS
PARTICLE IDENTIFICATION
PARTICLE RAPIDITY
PARTICLES
PROTON-PROTON INTERACTIONS
PROTONS
SPECTRA
TRANSVERSE MOMENTUM