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Article overview
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Quantitative Constraints on the Opacity of Hot Partonic Matter from Semi-Inclusive Single High Transverse Momentum Pion Suppression in Au+Au collisions at sqrt(s_NN) = 200 GeV | | PHENIX Collaboration
; A. Adare
; | | Date: |
10 Jan 2008 | | Abstract: | The PHENIX experiment has measured the suppression of semi-inclusive single
high transverse momentum pi^0’s in Au+Au collisions at sqrt(s_NN) = 200 GeV.
The present understanding of this suppression is in terms of energy-loss of the
parent (fragmenting) parton in a dense color-charge medium. We have performed a
quantitative comparison between various parton energy-loss models and our
experimental data. The statistical point-to-point uncorrelated as well as
correlated systematic uncertainties are taken into account in the comparison.
We detail this methodology and the resulting constraint on the model parameters
of medium opacity, as characterized via the initial color-charge density
dN^g/dy or the medium transport coefficient q^hat. We find that high transverse
momentum pi^0 suppression in Au+Au collisions has sufficient accuracy to
constrain these model dependent opacity parameters at the level of +/- 20-25%
(1 standard deviation). These constraints include only the experimental
uncertainties, and further studies are needed to compute the corresponding
theoretical uncertainties. Extracting fundamental model-independent
characteristics of the medium requires resolution of the differences in the
model calculations. | | Source: | arXiv, 0801.1665 | | Services: | Forum | Review | PDF | Favorites | |
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