  To obtain more precise parton distribution functions (PDFs) it is important
to include data on inclusive high transverse energy jet production in the
global parton analyses. These data have high statistics and the NNLO terms in
the perturbative QCD (pQCD) description are now available. Our aim is to reduce
the uncertainty in the comparison of the jet data with pQCD. To ensure the best
convergence of the pQCD series it is important to choose the appropriate
factorization scales, $\mu_F$. We show that it is possible to absorb and resum
in the incoming PDFs and fragmentation function ($D$) an essential part of the
higher $\alpha_s$ order corrections by determining the `optimal' values of
$\mu_F$. We emphasize that it is necessary to optimize different factorization
scales for the various factors in the cross section: indeed, both of the PDFs,
and also the fragmentation function, have their own optimal scale. We show how
the values of these scales can be calculated for the LO (NLO) part of the pQCD
prediction of the cross section based on the theoretically known NLO (NNLO)
corrections. After these scales are fixed at their optimal values, the residual
factorization scale dependence is much reduced.

High Energy Physics - Phenomenology