Identified Baryon and Meson Distributions at Large Transverse Momenta from Au+Au Collisions at {radical}(s{sub NN})=200 GeV
- Yale University, New Haven, Connecticut 06520 (United States)
- Panjab University, Chandigarh 160014 (India)
Transverse momentum spectra of {pi}{sup {+-}}, p, and 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(p) show significant suppression with respect to binary scaling at p{sub T}(greater-or-similar sign)4 GeV/c. Protons and antiprotons are less suppressed than {pi}{sup {+-}}, in the range 1.5 < or approx. p{sub T} < or approx. 6 GeV/c. The {pi}{sup -}/{pi}{sup +} and 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} > or approx. 5 GeV/c. The results at high p{sub T} indicate that the partonic sources of {pi}{sup {+-}}, p, and p have similar energy loss when traversing the nuclear medium.
- OSTI ID:
- 20860949
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.97.152301; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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