Antenna Showers with One-Loop Matrix Elements
Abstract
We consider the probability for a colour-singlet qqbar pair to emit a gluon, in strongly and smoothly ordered antenna showers. We expand to second order in alphaS and compare to the second-order QCD matrix elements for Z -> 3 jets, neglecting terms suppressed by 1/NC^2. We give a prescription that corrects the shower to the matrix-element result at this order for both soft and hard emissions, thereby explicitly reducing its dependence on evolution- and renormalization-scale choices. We confirm that the choice of pT for both of these scales absorbs all logarithms through order alphaS^2, and contrast this with various alternatives. We include these corrections in the VINCIA shower generator and study the impact on LEP event-shape and fragmentation observables. An uncertainty estimate is provided for each event, in the form of a vector of alternative weights.
Keywords
Cite
@article{arxiv.1303.4974,
title = {Antenna Showers with One-Loop Matrix Elements},
author = {L. Hartgring and E. Laenen and P. Skands},
journal= {arXiv preprint arXiv:1303.4974},
year = {2016}
}