[Rivet] undocumented behaviour in wfinder/zfinder (bug ?)

[Nicolas Morange]

Hello,

I'm writing a Z+jets analysis.
Thus I use a ZFinder whose remainingFinalState() is chained to a FastJet.
However, the code in ZFinder

00044     LeptonClusters leptons(fs, bareleptons, dRmax,
00045                            clusterPhotons, excludePhotonsFromRFS,
00046                            etaRanges, pTmin);
00047     addProjection(leptons, "LeptonClusters");
00048     InvMassFinalState imfs(leptons, std::make_pair(pid, -pid), m2_min, 
m2_max);
00049     addProjection(imfs, "IMFS");
00050 
00051     VetoedFinalState remainingFS;
00052     
remainingFS.addVetoOnThisFinalState(leptons.constituentsFinalState());
00053     addProjection(remainingFS, "RFS");

gives me the impression that not only the Z leptons are removed from the 
remainingFS, but also the other leptons in the event.
Is this correct ?
And how should I do to remove only the Z leptons (and associated photons) from 
the final state ?

Cheers,
Nicolas