Centrality dependence of the differential invariant yield in collisions (solid symbols). The curves are number-of-binary-collision-scaled Levy functions from fitting to the result (open circles), which has been updated from Ref. [1] with the latest global analysis of charm fragmentation ratios from Ref. [2] and also taking into account the dependence of the fragmentation ratio between and from pythia 6.4 [3]. The arrow denotes the upper limit with 90% confidence level of the last data point for 10%–40% collisions. The systematic uncertainties are shown as square brackets.
Panels (a),(b): for peripheral 40%–80% and semicentral 10%–40% collisions; panel (c): for 0%–10% most central events (blue circles) compared with model calculations from the TAMU (solid curve), SUBATECH (dashed curve), Torino (dot-dashed curve), Duke (long-dashed and long-dot-dashed curves), and LANL groups (filled band). The open symbol indicates the result with the extrapolated reference. The vertical lines and brackets around the data points denote the statistical and systematic uncertainties, respectively. The vertical bars around unity denote the overall normalization uncertainties in the and data, respectively. The probability distribution for the data point is largely skewed. The uncertainty we report is the 68.3% probability range with respect to the measured central value assuming Gaussian distribution.
Integrated as a function of in different regions: (squares), 0.7–2.2 (diamonds), and (circles). Open symbols are for the 0%–80% minimum bias events. The vertical bar around unity denotes the overall normalization uncertainty from reference.