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

PHENIX Collaboration

Hachiya Takashi

Homma Kensuke

Kohara Ryota

Nakamura Tomoaki

Shigaki Kenta

Sugitate Toru

Tsuchimoto Yuji

Physical Review C - Nuclear Physics

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 〈sin2 φjj〉, 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 〈sin2 φjj〉 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.

deuteron-nucleus reactions

proton-proton interactions

nuclei with mass number 190 to 219

elementary particle jets

nuclear fragmentation

nuclear matter

eng

American Physical Society

Copyright (c) 2006 The American Physical Society.

[ISSN] 0556-2813

[DOI] 10.1103/PhysRevC.73.054903

[NCID] AA00773613

[DOI] http://dx.doi.org/10.1103/PhysRevC.73.054903