id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc 365,Incomplete variation weights for MEPS@NLO samples,Frank Siegert,Enrico Bothmann,"The newly implemented variation weights for MEPS@NLO samples fail to take into account the shower weight, which can come from the B/Bbar in (2.14) of arXiv:1207.5030 as long as CSS_USE_BWW=1 (the default). This has two consequences: 1.) The variation weights are incomplete, i.e. a trivial 1.,1. variation does not always reproduce the nominal weight. Trivial workaround for users of 2.2.1: Include the 1.,1. variation in your runs and multiply all variation weights by the following ratio (e.g. in HepMC terms assuming the default PDF): {{{ event->weights[0]/event->weights[""MUR1_MUF1_PDF261000""] }}} 2.) The variation of the B/Bbar term is missing in the variation weights and would thus not give perfect closure. This will make even less of a difference, but should be fixed for completeness in the future. In both cases the difference is (fortunately) beyond the NLO accuracy of the method.",defect,new,major,rel-2.3.0,Hadron Decays,2.2.1,,,marek