Peter Richardson, Alexandra Wilcock
We use the POWHEG formalism in the Herwig++ event generator to match QCD real-emission matrix elements with the parton shower for a range of decays relevant to Beyond the Standard Model physics searches. Applying this correction affects the shapes of experimental observables, changing the number of events passing selection cuts. To illustrate this effect we consider the invariant-mass distribution of dijets produced in the decay of the lightest Randall-Sundrum graviton and jet measure and transverse momentum distributions for decays in Supersymmetry. We consider only the effect the POWHEG correction has on the shapes of distributions and ignore the global normalisation factor required to correct the total widths and branching ratios to next-to-leading order accuracy.
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http://arxiv.org/abs/1303.4563
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