<html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Dear RIVET experts, when running some of the MC_Z* analyses, I observed differences in the way histograms are normalised. E.g. in the analysis MC_ZJETS all histograms inherited from the MC_JetAnalysis are normalised using Scale(hist, crossSection()/sumOfWeights()) which in my opinion seems to be the correct approach. On the contrary, the two histograms Z_jet1_dR and Z_jet1_deta are normalised using normalize(hist, crossSection()/picobarn) which can be quite misleading in my opinion. The cross section passed to RIVET usually corresponds to the full generated sample of events. However, the histograms with the Z properties are only filled in a phase space with a Z mass requirement (and thus will have in general a smaller cross section). In my opnion, it would preferable to have a standard way of normalising histograms using the Scale(hist, crossSection()/sumOfWeights()) approach. THis problem basically affects all MC_Z* analyses while the MC_W* analyses look fine. Also, the description of MC_ZJETS (<a class="pathentry" href="https://rivet.hepforge.org/trac/browser/data?order=name" title="View data">data</a>/<a class="pathentry" href="https://rivet.hepforge.org/trac/browser/data/anainfo?order=name" title="View anainfo">anainfo</a>/<a class="pathentry" href="https://rivet.hepforge.org/trac/browser/data/anainfo/MC_ZJETS.info?order=name" title="View MC_ZJETS.info">MailScanner has detected a possible fraud attempt from "rivet.hepforge.org" claiming to be MC_ZJETS.info</a>) is a bit outdated as e.g. the Z mass distribution is not available. Cheers Christian </body> </html>