Polarizing the Dipoles
arXiv:0905.0883 · doi:10.1088/1126-6708/2009/08/085
Abstract
We extend the massless dipole formalism of Catani and Seymour, as well as its massive version as developed by Catani, Dittmaier, Seymour and Trocsanyi, to arbitrary helicity eigenstates of the external partons. We modify the real radiation subtraction terms only, the primary aim being an improved efficiency of the numerical Monte Carlo integration of this contribution as part of a complete next-to-leading order calculation. In consequence, our extension is only applicable to unpolarized scattering. Upon summation over the helicities of the emitter pairs, our formulae trivially reduce to their original form. We implement our extension within the framework of Helac-Phegas, and give some examples of results pertinent to recent studies of backgrounds for the LHC. The code is publicly available. Since the integrated dipole contributions do not require any modifications, we do not discuss them, but they are implemented in the software.
20 pages, 4 figures, Integrated dipoles implemented for massless and massive cases
References in corpus (21)
- Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
- An Automated Implementation of On-Shell Methods for One-Loop Amplitudes
- Electroweak and QCD corrections to Higgs production via vector-boson fusion at the LHC
- Strong and electroweak corrections to the production of Higgs+2jets via weak interactions at the LHC
- On the Rational Terms of the one-loop amplitudes
- NLO QCD corrections to t tbar + jet production at hadron colliders
- Automating dipole subtraction for QCD NLO calculations
- NLO QCD corrections to pp -> t anti-t b anti-b + X at the LHC
- Automation of the Dipole Subtraction Method in MadGraph/MadEvent
- Polarized QED splittings of massive fermions and dipole subtraction for non-collinear-safe observables
- QCD corrections to tri-boson production
- Next-to-leading order QCD corrections to W+Z and W-Z production via vector-boson fusion
- QCD corrections to hadronic WWZ production with leptonic decays
- NLO QCD corrections to WW+jet production at hadron colliders
- Optimizing the Reduction of One-Loop Amplitudes
- The NLO multileg working group: summary report
- TeVJet: A general framework for the calculation of jet observables in NLO QCD
- NLO QCD corrections to the production of t-tbar-Z in gluon fusion
- One-Loop Calculations with BlackHat
- Automating dipole subtraction
- NLO QCD corrections to pp->WW+jet+X