6  (deg) φ Δ -150 -100 -50 0 50 100 150 η Δ -1.5 -1 -0.5 0 0.5 1 1.5 0.994 0.997 1.000 1.003 1.006 1.009 1.012 0 to 10% Centrality FIG. 4: The CI (sum of all charged-particle-pairs) correlation for the 0-10% centrality bin with a charged particle p t selection (0.8 < p t < 4.0 GeV/c), generated by the PBM. It is plotted as a two dimensional Δ φ vs. Δ η perspective plot. small. ble due to strong jet quenching[9, 15, 16]. As one can see in Fig. 4 the central CI correlation of Δ φ on the near side (Δ φ < 90 ◦ ), is sharp and approximately jetlike at all Δ η . In contrast the Δ η dependence is relatively flat. In the central production the average observed angles are approximately 30 ◦ in Δ φ and 70 ◦ in Δ η . It is of interest to note that the sharp jetlike collimation in Δ φ persists at all centralities (0-80%). The elongation in Δ η persists in the 0-30% centrality range and then decreases with decreasing centrality becoming jetlike in the peripheral bins. These characteristics are in reasonable quantitative agreement with the fits of the PBM and the PBME to experimental data analyses[6, 12–14]. The CI correlation used in Fig. 4 and the PBM[6] is also defined as the sum of two charged-particle- pair correlations. They are the unlike-sign charge pairs (US) and the like-sign charge pairs (LS). This Charge Independent correlation (CI) is defined as the correlation made up of charged-particle-pairs in- dependent of what the sign is, which is the average of the US plus the LS correlations. Thus CI = (US + LS)/2. Therefore the CI is the total charge pair correlation observed in the experimental detection system within its acceptance. The CI was generated for √ s NN = 200 GeV central (0-5%) Au Au collisions in the p t range 0.8 GeV/c to 4.0 GeV/c at RHIC. When the CI was compared to the corresponding experimental analyses[12, 14] a reasonably quantitative agreement within a few percent of the observed CI was at- tained. See Ref.[6] Sec. 4.2, Ref.[13] Sec. V, and Ref.[14] Sec. VI B $^{1}$. This analysis and our previous work[6, 13] was done without using a jet trigger. In fact jet production in the central region was negligi- The difference of the US and LS correlations is defined as the Charge Dependent (CD) correlation (CD = US - LS). The 2-D experimental CD cor- relation for centralities (0-80%) has a jetlike shape which is consistent with PYTHIA jets (vacuum frag- mentation) for all centralities. This clearly implies that both particle hadronization and emission oc- cur from the fireball surface region as explained in Ref.[13] Sec. II. 1 The STAR collaboration preferred to use the conventional definition of CI = US + LS which is larger by a factor of 2 than the CI definition used in this present paper that is directly physically meaningful.