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A method for incorporating information from next-to-leading order QCD matrixelements for hadronic diboson production into showering event generators ispresented. In the hard central region (high jet transverse momentum) whereperturbative QCD is reliable, events are sampled according to the first ordertree level matrix element. In the soft and collinear regions next-to-leadingorder corrections are approximated by calculating the differential crosssection across the phase space accessible to the parton shower using the firstorder (virtual graphs included) matrix element. The parton shower then providesan all-orders exclusive description of parton emissions. Events generated inthis way provide a physical result across the entire jet transverse momentumspectrum, have next-to-leading order normalization everywhere, and havepositive definite event weights. The method is generalizable withoutmodification to any color singlet production process.Comment: 13 pages, 9 figure

Incorporating next-to-leading order matrix elements for hadronic diboson production in showering event generators