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We use the POWHEG formalism in the Herwig++ event generator to match QCDreal-emission matrix elements with the parton shower for a range of decaysrelevant to Beyond the Standard Model physics searches. Applying thiscorrection affects the shapes of experimental observables and so changes thenumber of events passing selection criteria. To validate this approach, westudy the impact of the correction on Standard Model top quark decays. We thenillustrate the effect of the correction on Beyond the Standard Model scenariosby considering the invariant-mass distribution of dijets produced in the decayof the lightest Randall-Sundrum graviton and transverse momentum distributionsfor decays in Supersymmetry. We consider only the effect of the POWHEGcorrection on the simulation of the hardest emission in the shower and ignorethe normalisation factor required to correct the total widths and branchingratios to next-to-leading order accuracy.

Monte Carlo Simulation of Hard Radiation in Decays in Beyond the Standard Model Physics in Herwig++