[Rivet] Problem with Rivet LEP Four Jet Analysis

[Frank Siegert]

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.

Frank

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