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One of the most important developments in Monte Carlo simulation of colliderevents for the LHC has been the arrival of schemes and codes for matching ofparton showers to matrix elements calculated at next-to-leading order in theQCD coupling. The POWHEG scheme, and particularly its implementation in thePOWHEG-BOX code, has attracted most attention due to ease of use and effectiveportability between parton shower algorithms.  But formal accuracy to NLO does not guarantee predictivity, and thebeyond-fixed-order corrections associated with the shower may be large.Further, there are open questions over which is the "best" variant of thePOWHEG matching procedure to use, and how to evaluate systematic uncertaintiesdue to the degrees of freedom in the scheme.  In this paper we empirically explore the scheme variations allowed in Pythia8matching to POWHEG-BOX dijet events, demonstrating the effects of both discreteand continuous freedoms in emission vetoing details for both tuning to data andfor estimation of systematic uncertainties from the matching and parton showeraspects of the POWHEG-BOX+Pythia8 generator combination.

Powheg-Pythia matching scheme effects in NLO simulation of dijet events