Centrality evolution of p(t) and y(t) spectra from Au-Au collisions at s(NN)**(1/2) = 200-GeV - INSPIRE

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Centrality evolution of p(t) and y(t) spectra from Au-Au collisions at s(NN)**(1/2) = 200-GeV

Thomas A. Trainor
(
- CENPA, Seattle
)

Oct, 2007

21 pages

Published in:

Int.J.Mod.Phys.E 17 (2008) 1499-1540

e-Print:

0710.4504 [hep-ph]

DOI:

10.1142/S021830130801057X

View in:

ADS Abstract Service

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Abstract: (arXiv)

A two-component analysis of spectra to

p_t = 12

GeV/c for identified pions and protons from 200 GeV Au-Au collisions is presented. The method is similar to an analysis of the

n_{ch}

dependence of

p_t

spectra from p-p collisions at 200 GeV, but applied to Au-Au centrality dependence. The soft-component reference is a L\'evy distribution on transverse mass

m_t

. The hard-component reference is a Gaussian on

y_t

with exponential (

p_t

power-law) tail. Deviations of data from the reference are described by hard-component ratio

r_{AA}

which generalizes nuclear modification factor

R_{AA}

. The analysis suggests that centrality evolution of pion and proton spectra is dominated by changes in parton fragmentation. The structure of

r_{AA}

suggests that parton energy loss produces a negative boost

\Delta y_t

of a large fraction (but not all) of the minimum-bias fragment distribution, and that lower-energy partons suffer relatively less energy loss, possibly due to color screening. The analysis also suggests that the anomalous

p/\pi

ratio may be due to differences in the parton energy-loss process experienced by the two hadron species. This analysis provides no evidence for radial flow.

13.87.Fh
12.38.Qk
13.66.Bc
13.87.-a
25.75.-q
25.40.Ep
25.75.Gz
Two-component model
heavy ions
spectra

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