[Rivet] delta phi of jets with sherpa

[Frank Siegert]

Hi Ulrike,

this is clearly not a Rivet question, but a generator question. Have you 
checked whether both generators give the same total cross section for 
the same cuts? Also, is it possible that the units in the HepMC file are 
accidently inconsistent with what the generator claims (normally pb and 
GeV)?

Frank

On 15/09/11 11:10, Ulrike Schnoor wrote:
> 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
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