  Comparisons of experimental data with theoretical predictions for collider
processes containing hadronic jets rely on shower Monte Carlo event generators
to include corrections to perturbative calculations from hadronization, parton
showering, multiple parton collisions. We examine current treatments of these
corrections and propose alternative methods to take into account
nonperturbative effects and parton showering in the context of
next-to-leading-order (NLO) event generators. We point out sizeable
parton-showering corrections to jet transverse energy spectra at high rapidity,
and discuss kinematic shifts in longitudinal momentum distributions from
initial state showering in the case both of jet production and of heavy mass
production at the Large Hadron Collider.
