Two-particle correlations in Pb-Au collisions at 80A GeV beam energy

The calibration scheme of the CERES TPC has been improved with respect to the data reconstruction used in [1], which leads to a remarkable decrease of the systematic error for the 80A GeV and 158A GeV data set. Figure 1 shows the new results of the HBT parameters for collisions at 80A GeV in the Bertsch-Pratt parametrization as a function of the transverse pair momentum k⊥. The new values are compared to the published results as well as to the results obtained by the NA49 collaboration for the same beam energy. Systematic errors are depicted in filled boxes around the data points. For the error calculation effects due to finite momentum resolution, the fitting procedure, the Coulomb correction and the applied pair cuts are included. Regarding absolute values, the new analysis yields slightly larger Rout and Rlong parameters in the low k⊥ bins. In comparison to the NA49 results, the recent analysis entails a good agreement between both experiments.