as normal except that the hardest emission is fixed at the generated scale. In addition to this, the soft matrix element correction is applied to all emissions in the parton shower which are the hardest so far. Normally this leads to the correction of both the hardest emission and a number of other emissions with large values of the evolution parameter, but smaller transverse momentum. These differences all contribute to the discrepancies between the POWHEG style and matrix element corrected distributions although it is unclear which would have the largest effect. However, the difference between the POWHEG style and matrix element corrected results is comparatively small. The agreement between the two approaches serves to further validate our implementation of the POWHEG formalism. Finally, we note that the POWHEG style approach is preferable to the original matrix element correction scheme since it is significantly simpler to implement in .

Decays of BSM Particles {#sec:BSMDecays}
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As discussed in Sect. \[sec:Intro\], it is important that the simulation of QCD radiation in the decays of BSM particles is done in the most accurate way possible. In this work, we present results illustrating the effect of consistently matching the QCD real-emission matrix element with 