/ Experiment-Nucl nucl-ex/0510021

Jet structure from dihadron correlations in d+Au collisions at s(NN)**(1/2) = 200-GeV

Adler, Stephen Scott ; Afanasiev, S. ; Aidala, C. ; Ajitanand, N.N. ; Akiba, Y. ; Al-Jamel, A. ; Alexander, J. ; Aoki, K. ; Aphecetche, L. ; Armendariz, R. ; Aronson, S.H. ; Averbeck, R. ; Awes, T.C. ; Babintsev, V. ; Baldisseri, A. ; Barish, K.N. ; Barnes, P.D. ; Bassalleck, B. ; Bathe, S. ; Batsouli, S. ; Baublis, V. ; Bauer, F. ; Bazilevsky, A. ; Belikov, S. ; Bjorndal, M.T.

Published in: Phys.Rev.
Year: 2006
Vol.: C73
Page No: 054903
Pages: 30

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.

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