Jet structure from dihadron correlations in d+Au collisions at sNN=200 GeV

S. S. Adler et al. (PHENIX Collaboration)
Phys. Rev. C 73, 054903 – Published 10 May 2006

Abstract

Dihadron correlations at high transverse momentum pT in d+Au collisions at sNN=200 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 jT2, the mean sine-squared of the azimuthal angle between the jet axes sin2ϕjj, and the number of particles produced within the dijet that are associated with a high-pT particle (dN/dxE distributions). We observe that the fragmentation characteristics of jets in d+Au collisions are very similar to those in p+p collisions and that there is little dependence on the centrality of the d+Au 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 sin2ϕjj from p+p to d+Au collisions. This constrains the effect of multiple scattering that partons undergo in the cold nuclear medium before and after a hard collision.

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  • Received 7 October 2005

DOI:https://doi.org/10.1103/PhysRevC.73.054903

©2006 American Physical Society

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Vol. 73, Iss. 5 — May 2006

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