Abstract
Dihadron correlations at high transverse momentum in collisions at GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider. From these correlations, we extract several structural characteristics of jets: the root-mean-squared transverse momentum of fragmenting hadrons with respect to the jet , the mean sine-squared of the azimuthal angle between the jet axes , and the number of particles produced within the dijet that are associated with a high- particle ( distributions). We observe that the fragmentation characteristics of jets in collisions are very similar to those in collisions and that there is little dependence on the centrality of the collision. This is consistent with the nuclear medium having little influence on the fragmentation process. Furthermore, there is no statistically significant increase in the value of from to collisions. This constrains the effect of multiple scattering that partons undergo in the cold nuclear medium before and after a hard collision.
35 More- Received 7 October 2005
DOI:https://doi.org/10.1103/PhysRevC.73.054903
©2006 American Physical Society