Merging parton showers and matrix elements — back to basics ∗
نویسنده
چکیده
We make a thorough comparison between different schemes of merging fixedorder tree-level matrix element generators with parton-shower models. We use the most basic benchmark of the O(αS) correction to ee → jets, where the simple kinematics allows us to study in detail the transition between the matrix-element and parton-shower regions. We find that the CKKW-based schemes give a reasonably smooth transition between these regions, although problems may occur if the parton shower used is not ordered in transverse momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have potentially serious problems due to different scale definitions in different regions of phase space, and due to sensitivity to the details in the initial conditions of the parton shower programs used.
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