Year: 2013
Type: article
Abstract: We consider the probability for a colour-singlet $ q\overline{q} $ pair to emit a gluon, in strongly and smoothly ordered antenna showers. We expand to second order inαsand compare to the second-order QCD matrix elements forZ→ 3 jets, neglecting terms suppressed by $ {1 \left/ {{N_C^2}} \right.} $ . 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 ofp⊥for both of these scales absorbs all logarithms through $ \mathcal{O}\left( {\alpha_s^2} \right) $ , 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.
Source: Journal of High Energy Physics
Authors: L. Hartgring, E. Laenen, P. Skands
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid:
OpenAlex ID: W1984514124