Azimuthal asymmetries of particles emitted in relativistic heavy-ion collisions

Experimental particle yield ratios from 14.6A-GeV/${\mathit{c}}^{28}$Si interactions with nuclei at intermediate impact parameters are correlated with the orientation of the transverse momentum of projectile fragments. The ${\mathrm{\pi }}^{\pm }$/p ratio increases and the (d+t)/p ratio decreases when fragments are deflected toward the observing spectrometer. Asymmetries are confined to the target rapidity region. Assuming a spectator participant model, these results suggest the presence of significant rescattering of particles with dependences on the collision geometry.