[Rivet] Problem with Rivet LEP Four Jet Analysis

[Simon Plaetzer]

Dear Rivet developers,

when running the LEP four jet correlation analysis the Rivet output is 
not compatible with the builtin Herwig++ analysis. Besides the fact that 
Rivet seems to use much less events than the Herwig++ analysis selects 
for the observables, the shape of especially \alpha_{34} is completely 
different.

Attached you can find the plots from the Herwig++ analysis and the Rivet 
analysis, originating from the very same run of 500k events (in this case 
Herwig++ 2.4.0 and Rivet 1.1.3, both using fastjet 2.4.1).

The Rivet analysis issues the warnings

Rivet.Analysis.DELPHI_2003_WUD_03_11: WARN  numdurjets   = 36515
Rivet.Analysis.DELPHI_2003_WUD_03_11: WARN  numjadejets  = 63975
Rivet.Analysis.DELPHI_2003_WUD_03_11: WARN  sumofweights = 499960

Best,
Simon
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