Collinearity approximations and kinematic shifts in partonic shower algorithms

Abstract

We study kinematic effects due to the approximation of on-shell, collinear partons in shower Monte Carlo event generators. We observe that the collinearity approximation, combined with the requirements of energy-momentum conservation, gives rise to a kinematic shift, event by event, in longitudinal momentum distributions. We present numerical results in the case of jet and heavy flavor production processes measured at the LHC.

3 pages, 2 figures

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• Longitudinal momentum shifts, showering and nonperturbative corrections in matched NLO-shower event generators
• Back-to-back azimuthal correlations in Z+jet events at high transverse momentum in the TMD parton branching method at next-to-leading order
• Neutral Current Forward-Backward Asymmetry: from ${\theta }_W$ to PDF Determinations
• Azimuthal correlations of high transverse momentum jets at next-to-leading order in the parton branching method
• Collinear and TMD distributions with dynamical soft-gluon resolution scale
• QCD theory overview
• QCD at high-luminosity hadron colliders