TY - JOUR
T1 - Efficient matrix-element matching with sector showers
AU - Lopez-Villarejo, J. J.
AU - Skands, P.
PY - 2011
Y1 - 2011
N2 - A Markovian shower algorithm based on "sector antennae" is presented and its main properties illustrated. Tree-level full-color matrix elements can be automatically incorporated in the algorithm and are re-interpreted as process-dependent 2 → n antenna functions. In hard parts of phase-space, these functions generate tree-level matrix-element corrections to the shower. In soft parts, they should improve the logarithmic accuracy of it. The number of matrix-element evaluations required per order of matching is 1, with an unweighting effciency that remains very high for arbitrary numbers of legs. Total rates can be augmented to NLO precision in a straightforward way. As a proof of concept, we present an implementation in the publicly available Vincia plug-in to the Pythia 8 event generator, for hadronic Z0 decays including tree-level matrix elements through O(α4 s).
AB - A Markovian shower algorithm based on "sector antennae" is presented and its main properties illustrated. Tree-level full-color matrix elements can be automatically incorporated in the algorithm and are re-interpreted as process-dependent 2 → n antenna functions. In hard parts of phase-space, these functions generate tree-level matrix-element corrections to the shower. In soft parts, they should improve the logarithmic accuracy of it. The number of matrix-element evaluations required per order of matching is 1, with an unweighting effciency that remains very high for arbitrary numbers of legs. Total rates can be augmented to NLO precision in a straightforward way. As a proof of concept, we present an implementation in the publicly available Vincia plug-in to the Pythia 8 event generator, for hadronic Z0 decays including tree-level matrix elements through O(α4 s).
KW - QCD Phenomenology
UR - http://www.scopus.com/inward/record.url?scp=84255176441&partnerID=8YFLogxK
U2 - 10.1007/JHEP11(2011)150
DO - 10.1007/JHEP11(2011)150
M3 - Article
AN - SCOPUS:84255176441
SN - 1126-6708
VL - 2011
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 11
M1 - 150
ER -