Jet properties from dihadron correlations in p+p collisions at s=200GeV

S. S. Adler et al. (PHENIX Collaboration)
Phys. Rev. D 74, 072002 – Published 5 October 2006

Abstract

The properties of jets produced in p+p collisions at s=200GeV are measured using the method of two-particle correlations. The trigger particle is a leading particle from a large transverse momentum jet while the associated particle comes from either the same jet or the away-side jet. Analysis of the angular width of the near-side peak in the correlation function determines the jet-fragmentation transverse momentum jT. The extracted value, jT2=585±6(stat)±15(sys)MeV/c, is constant with respect to the trigger particle transverse momentum, and comparable to the previous lower s measurements. The width of the away-side peak is shown to be a convolution of jT with the fragmentation variable, z, and the partonic transverse momentum, kT. The z is determined through a combined analysis of the measured π0 inclusive and associated spectra using jet-fragmentation functions measured in e+e collisions. The final extracted values of kT are then determined to also be independent of the trigger particle transverse momentum, over the range measured, with value of kT2=2.68±0.07(stat)±0.34(sys)GeV/c.

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  • Received 12 May 2006

DOI:https://doi.org/10.1103/PhysRevD.74.072002

©2006 American Physical Society

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Vol. 74, Iss. 7 — 1 October 2006

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