GRACE-NLO for the LHC

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+jet and di-photon processes are given for demonstrating a validity of this method.