[Rivet] Problem with Rivet LEP Four Jet Analysis

[Frank Siegert]

Frank Siegert, Wednesday 23 September 2009:
> Hendrik Hoeth, Wednesday 23 September 2009:
> > Thus spake Frank Siegert (frank.siegert at durham.ac.uk):
> > > In addition to what Hendrik pointed out: Do you happen to be using
> > > *all* particles in your internal analysis, or only the charged
> > > particles? I also saw discrepancies between my own implementation
> > > of this analysis and the Rivet one, and it turned out to be
> > > important to restrict your analysis to charged particles only.
> >
> > Well, no matter what, but looking at this Rivet plots it's clear that
> > they are wrong.
>
> Yes, I have to admit that I hadn't looked at your plots yet when I
> wrote this. The differences I saw where much more subtle, but still
> noticeable. I can't confirm that the trunk version of this analysis is
> broken (see attached plot for a rough idea of what Sherpa looks like
> compared to the Durham cos(a34) from Rivet trunk). I'll check whether
> there is a difference to 1.1.3 though.

Ah, yes, now I remember:

http://projects.hepforge.org/rivet/trac/changeset/1697

Frank