Jet Properties from Dihadron Correlations in p+p Collisions at sqrt(s)=200 GeV

Details Jet Properties from Dihadron Correlations in p+p Collisions at sqrt(s)=200 GeV Jet Properties from Dihadron Correlations in p+p Collisions at sqrt(s)=200 GeV

2006-05-12

arxiv.org/abs/hep-ex/0605039v1

Phys.Rev.D74:072002,2006

Physics

High Energy Physics

High Energy Physics - Experiment

330 authors, 27 pages, 31 figures, 12 tables. Submitted to Physical Review D. Plain text data tables for the points plotted in

Scientific paper

10.1103/PhysRevD.74.072002

The properties of jets produced in p+p collisions at sqrt(s)=200 GeV 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 j_T . The extracted value, sqrt()= 585 +/- 6(stat) +/- 15(sys) MeV/c, is constant with respect to the trigger particle transverse momentum, and comparable to the previous lower sqrt(s) measurements. The width of the away-side peak is shown to be a convolution of j_T with the fragmentation variable, z, and the partonic transverse momentum, k_T . The is determined through a combined analysis of the measured pi^0 inclusive and associated spectra using jet fragmentation functions measured in e^+e^-. collisions. The final extracted values of k_T are then determined to also be independent of the trigger particle transverse momentum, over the range measured, with value of sqrt() = 2.68 +/- 0.07(stat) +/- 0.34(sys) GeV/c.

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