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Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC

J. Adams

Abstract

We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high $p_T$) in minimum bias and central d+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high $p_T$ previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions.

Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC

Abstract

We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high ) in minimum bias and central d+Au collisions at =200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions.

Paper Structure

This paper contains 3 equations, 4 figures, 1 table.

Figures (4)

  • Figure 1: Uncorrected charged particle multiplicity distributions measured in $-3.8 < \eta < -2.8$ (Au-direction) for d+Au collisions. Points are for minimum bias (triangles) and peripheral (circles, ZDC-d single neutron) collisions. Both are normalized to the total number of d+Au collisions. Histograms are Glauber model calculations.
  • Figure 2: Inclusive $p_T$ distributions for minimum bias and central d+Au collisions, and non-singly diffractive p+p collisions STARHighpt200. Hash marks at the top indicate bin boundaries for $p_T$$>$3.8 GeV/c.
  • Figure 3: $R_{AB}(\hbox{$p_T$})$ from Eq. \ref{['RAA']} for minimum bias and central d+Au collisions, and central Au+Au collisionsSTARHighpt200. The minimum bias d+Au data are displaced 100 MeV/c to the right for clarity. The bands show the normalization uncertainties, which are highly correlated point-to-point and between the two d+Au distributions.
  • Figure 4: (a) Efficiency corrected two-particle azimuthal distributions for minimum bias and central d+Au collisions, and for p+p collisionsSTARHighptCorrelations. Curves are fits using Eq. \ref{['EqCorr']}, with parameters given in Table \ref{['TableCorr']}. (b) Comparison of two-particle azimuthal distributions for central d+Au collisions to those seen in p+p and central Au+Au collisions STARHighptCorrelations. The respective pedestals have been subtracted.