Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-02-10
Phys.Rev.D84:054003,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
72 pages, 78 figures
Scientific paper
10.1103/PhysRevD.84.054003
We present a simple formalism for the evolution of timelike jets in which tree-level matrix element corrections can be systematically incorporated, up to arbitrary parton multiplicities and over all of phase space, in a way that exponentiates the matching corrections. The scheme is cast as a shower Markov chain which generates one single unweighted event sample, that can be passed to standard hadronization models. Remaining perturbative uncertainties are estimated by providing several alternative weight sets for the same events, at a relatively modest additional overhead. As an explicit example, we consider Z -> q qbar evolution with unpolarized, massless quarks and include several formally subleading improvements as well as matching to tree-level matrix elements through alpha_s^4. The resulting algorithm is implemented in the publicly available VINCIA plugin to the PYTHIA 8 event generator.
Giele Walter T.
Kosower David A.
Skands Peter Zeiler
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