Identified baryon and meson distriburions at large transverse momenta from Au+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Phys. Rev. Lett.

DOI:https://doi.org/10.1103/PhysRevLett.97.152301· OSTI ID:965755

Cadman, R V; Krueger, K; Spinka, H M; McClain, C J; Underwood, D G; Abelev, B I; Aggarwal, M M; Ahammed, Z; Anderson, B D; Anderson, M

Transverse momentum spectra of {pi}{sup {+-}}, p, and {bar p} up to 12 GeV/c at midrapidity in centrality selected Au+Au collisions at {radical}s{sub NN} = 200 GeV are presented. In central Au+Au collisions, both {pi}{sup {+-}} and p({bar p}) show significant suppression with respect to binary scaling at p{sub T} {approx}> 4 GeV/c. Protons and antiprotons are less suppressed than {pi}{sup {+-}}, in the range 1.5 {approx}< p{sub T} {approx}< 6 GeV/c. The {pi}{sup -}/{pi}{sup +} and {bar p}/p ratios show at most a weak p{sub T} dependence and no significant centrality dependence. The p/{pi} ratios in central Au+Au collisions approach the values in p+p and d+Au collisions at p{sub T} {approx}> 5 GeV/c. The results at high p{sub T} indicate that the partonic sources of {pi}{sup {+-}}, p, and {bar p} and have similar energy loss when traversing the nuclear medium.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 965755
• Report Number(s): ANL-HEP-PR-09-60
• Journal Information: Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: 2009 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTIPROTONS
BARYONS
MESONS
PROTONS
SPECTRA
TRANSVERSE MOMENTUM