Abstract
Automatic Feynman-amplitude calculation system, GRACE , is a generator of event generators, which was originally designed to calculate the processes in the standard electroweak theory. Recently GRACE has been extended to treat next-to-leading order (NLO) QCD calculations ( GRACE-NLO ). Matrix elements of loop diagrams as well as those of tree level ones can be generated using the GRACE system. A soft/collinear singularity is treated using a leading-log subtraction method. Higher order re-summation of the soft/collinear correction by the parton shower method is combined with the NLO matrix-element without any double-counting in this method. For the LHC physics, the GR@PPA framework has been prepared to include the parton distribution function (PDF) and the treatment of lots of subprocesses. Combing GRACE-NLO with the GR@PPA framework, the event generators for W + j e t and di-photon processes are given for demonstrating a validity of this method.
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