Three-Dimensional two-pion source image from Pb+Pb Collisions at SqrtsNN=17.3 GeV: New constraints for source breakup dynamics
Abstract
Source imaging methodology is used to provide a three-dimensional two-pion source function for mid-rapidity pion pairs with pT<70 MeV/c in central (0-7%) Pb+Pb collisions at sNN=17.3 GeV. Prominent non-Gaussian tails are observed in the pion pair transverse momentum (outward) and in the beam (longitudinal) directions. Model calculations reproduce them with the assumption of Bjorken longitudinal boost invariance and transverse flow blast-wave dynamics coupled with "outside-in burning" in the transverse direction; they also yield a proper time for breakup and emission duration for the pion source.
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