[Rivet] delta phi of jets with sherpa

[Ulrike Schnoor]

Dear RIVET experts,

When using RIVET to compare WHIZARD (hepmc files) to SHERPA (hepmc2g
files) I ran into the following problem with the azimuthal angle of
the jets' FourMomentum, which is happening with my own analysis as
well as with MC_WWJETS:
There are far less entries in the jets' phi or delta phi plots for
Sherpa than for Whizard. You can see this in the following plot made
with MC_WWJETS:
http://iktp.tu-dresden.de/~schnoor/rivet/jets_dphi_12.pdf. Has this
happened before, and what could I do to avoid this? I have already
tried to rescale the histograms, with no effect.
The same is happening in my private analysis that also needs the
azimuthal angle of jets. In addition, the MET distributions of the two
generators look rather different as shown in this plot:
http://iktp.tu-dresden.de/~schnoor/rivet/MC_VBS/missingET.pdf
Could this be related to the problem with the jets' phi coordinates?

Please have a look at this and let me know if you need more information.
Many thanks,
Ulrike