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Jet Structure from Dihadron Correlations in d+Au collisions at $\sqrt{S-{NN}}$=200 GeV (2006)

Abstract
Dihadron correlations at high transverse momentum in d+Au collisions at sqrt(s_NN) = 200 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). From these correlations we extract several structural characteristics of jets; the root-mean-squared (RMS) transverse momentum of fragmenting hadrons with respect to the jet sqrt(< j_T^2 >), the mean sine-squared angle between the scattered partons < sin^2(phi_jj) >, and the number of particles produced within the dijet that are associated with a high-p_T particle (dN/dx_E 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 also 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 < sin^2(phi_jj) > from p+p to d+Au collisions. This constrains the amount of multiple scattering that partons undergo in the cold nuclear medium before and after a hard-collision.

Publication details
Download http://hal.in2p3.fr/in2p3-00025236/en/
Publisher HAL - CCSd - CNRS
Contributors Jeanine Pellet
Repository CCSd/HAL : e-articles server (based on gBUS) (France)
Keywords Physics/High Energy Physics - Experiment, Physics/Nuclear Experiment
Type ART_ACL
Coverage deuteron-nucleus reactions; proton-proton interactions; nuclei with mass number 190 to 219; elementary particle jets; nuclear fragmentation; nuclear matter