Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at s(NN)**(1/2) = 200-GeV

Abelev, B.I.; Aggarwal, M.M.; Ahammed, Z.; Anderson, B.D.; Anderson, M.; Arkhipkin, D.; Averichev, G.S.; Bai, Y.; Balewski, J.; Barannikova, O.

doi:10.1103/PhysRevLett.97.152301

Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at s(NN)**(1/2) = 200-GeV

STAR

Collaboration

Jun, 2006

6 pages

Published in:

Phys.Rev.Lett. 97 (2006) 152301

e-Print:

nucl-ex/0606003 [nucl-ex]

DOI:

10.1103/PhysRevLett.97.152301

Experiments:

BNL-RHIC-STAR

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Abstract:

Transverse momentum spectra of

\pi^{\pm}

,

p

and

\bar{p}

up to 12 GeV/c at mid-rapidity in centrality selected Au+Au collisions at

\sqrt{s_{_{NN}}} = 200

GeV are presented. In central Au+Au collisions, both

\pi^{\pm}

and

p(\bar{p})

show significant suppression with respect to binary scaling at

p_T >

4 GeV/c. Protons and anti-protons are less suppressed than

\pi^{\pm}

, in the range 1.5

< p_{T} <

6 GeV/c. The

\pi^-/\pi^+

and

\bar{p}/p

ratios show at most a weak

p_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_T >

5 GeV/c. The results at high

p_T

indicate that the partonic sources of

\pi^{\pm}

,

p

and

\bar{p}

have similar energy loss when traversing the nuclear medium.

Note:

6 pages, 4 figures Journal-ref: Phys. Rev. Lett. 97, 152301 (2006) DOI: 10.1103/PhysRevLett.97.152301

13.85.Ni
25.75.Dw
nucleus nucleus: colliding beams
scattering: heavy ion
gold
hadron: multiple production
pi
p
anti-p
transverse momentum: spectrum

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