Collinearity approximations and kinematic shifts in partonic shower algorithms
University of Oxford, Physics Department, Oxford, OX1 3NP, UK
2 Deutsches Elektronen Synchrotron, 22603, Hamburg, Germany
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Revised: 5 November 2012
Published online: 11 December 2012
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.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2012