High - order collective flow correlations

Using 4π data from the Bevalac streamer chamber, azimuthal correlations for fragment pairs (as in conventional sideward flow analyses) and higher-order multiplets are studied for 400 A MeV Ar + Pb and 1200 A MeV Ar + BaI2. The authors point out that previous studies of sideward flow have not ruled out the possibility that the effect is dominated by a small number of correlated fragments in each event, as opposed to being a collective motion to which most or all fragments contribute. The authors infer the percentage of the forward going fragments that carry a component of the collective motion