title: Novel rapidity dependence of directed flow in high-energy heavy-Ion collisions
abstract: For high-energy nucleus-nucleus collisions, we show that a combination of space-momentum correlations characteristic of radial expansion, together with the correlation between the position of a nucleon in the nucleus and its stopping, results in a very specific rapidity dependence of directed flow: a reversal of sign in the midrapidity region. We support our argument by RQMD model calculations for Au+Au collisions at sqrt[s] = 200A GeV.
authors.affiliation: Nuclear Science Division, LBNL, Berkeley, California 94720, USA.
authors.initials: RJ
authors.lastname: Snellings
authors.initials: H
authors.lastname: Sorge
authors.initials: SA
authors.lastname: Voloshin
authors.initials: FQ
authors.lastname: Wang
authors.initials: N
authors.lastname: Xu