A general algorithm for calculating jet cross sections in NLO QCD
Abstract
We present a new general algorithm for calculating arbitrary jet cross sections in arbitrary scattering processes to nexttoleading accuracy in perturbative QCD. The algorithm is based on the subtraction method. The key ingredients are new factorization formulae, called dipole formulae, which implement in a Lorentz covariant way both the usual soft and collinear approximations, smoothly interpolating the two. The corresponding dipole phase space obeys exact factorization, so that the dipole contributions to the cross section can be exactly integrated analytically over the whole of phase space. We obtain explicit analytic results for any jet observable in any scattering or fragmentation process in lepton, leptonhadron or hadronhadron collisions. All the analytical formulae necessary to construct a numerical program for nexttoleading order QCD calculations are provided. The algorithm is straightforwardly implementable in general purpose Monte Carlo programs.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1997
 DOI:
 10.1016/S05503213(96)005895
 arXiv:
 arXiv:hepph/9605323
 Bibcode:
 1997NuPhB.485..291C
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 Resubmitted version corrects an error in the definitions of the Lorentz boosts used in sections 5.5 and 5.6. No other results are affected. 120 pages, 4 figures. This paper can also be obtained from http://surya11.cern.ch/users/seymour/pubs/nlo.html