Abstract:
The in-plane transverse momentum of pions in Ne(2A GeV)Pb and Au(2A GeV)Au collisions is analysed in the framework of the Vlasov-Uehling-Uhlenbeck model. The rapidity dependence of pion flow shows the opposite sign as the nucleon flow. The anticorrelation of pions and nucleons can be explained by multiple πN scattering. It turns out that the nonzero transverse momentum for pions at target rapidities is no proof for pion absorption in contrast to claims in previous works. Pion absorption does not influence the angular distribution of pions but plays an important role for the absolute numbers of produced pions. © 1993.
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