[Rivet] all events are vetoed in Drell Yan analysis

[Hendrik Hoeth]

Hi Holger,

Thus spake Holger Schulz (holger.schulz at physik.hu-berlin.de):

> I want to generate some data using the CDF_2008_NOTE_9351 analysis in
> Rivet and I am having trouble doing so. All the histos have zero
> entries due to the fact that all events are being vetoed during the
> execution of Rivet.analyze().

Check that you're using the right parameter files. I have no problems
generating events using rivet revision 980 with this command:

rivetgun -g Pythia6:418 -a CDF_2008_NOTE_9351 -P fpythia-cdfdrellyan.params -P fpythia-longlife-stable.params -P tevatron1960.params -n 1000

> Provided that everything is ok with the implementation of the analysis
> and that the rather strict cuts are unavoidable,

The cuts represent the cuts of the analysis. There is no way to change
those.

Cheers,

   Hendrik

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