  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(<j_T^2>)=
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 <z> 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(<k_T^2>) = 2.68 +/- 0.07(stat) +/- 0.34(sys)
GeV/c.
