Abstract
This paper describes the measurement of collective flow for charged particles in collisions at using the PHOBOS detector at the Relativistic Heavy Ion Collider (RHIC). The measured azimuthal hit anisotropy is presented over a wide range of pseudorapidity () for the first time at this energy. The result, averaged over momenta and particle species, is observed to reach 7% for peripheral collisions at midrapidity, falling off with centrality and increasing . These results call into question the common assumption of longitudinal boost invariance over a large region of rapidity in RHIC collisions.
- Received 29 May 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.222301
©2002 American Physical Society