Change of the azimuthal asymmetry at high momentum with different parton absorptions in a quark-gluon plasma

We present simple geometrical model calculations for parton suppression at high momentum, where the fragmentation process is dominant, in relativistic heavy-ion collisions. Depending on the position of hard scattering, the pattern of the parton absorption changes because of the different pathlengths to escape the overlapped zone. The out-of-plane yield of partons is more suppressed than the in-plane yield in the overlap zone, especially for large impact parameters. In addition, the in-plane yield is expected to decrease as the parton absorption is increased because of the strong parton absorption even before they reach the geometrical boundary of the overlapped zone. The present result is in contrast to that of previous calculations in which the saturation effect was observed to occur at a rather small absorption coefficient.