[Rivet] Bug/change in RIVET IdentifiedFinalState()?

[Marco Delmastro]

Hello,

Andy Buckley suggested that I report this bug (?) I encountered when using Rivet within the ATLAS Athena framework.

I'm writing the RIVET routines for the ATLAS 8 TeV inclusive diphoton and diphoton + jet analyses. In the first tests I made, running on a Pythia diphoton samples, I noticed something strange: only photons with eta > 1 were used, and the initial pT selection was not applied. I tracked down the problem to this method:

IdentifiedFinalState photonfs(Cuts::abseta < 2.37 && Cuts::pT > 30.*GeV); // 30 GeV cut on subleading photon

Apparently the 30 GeV cut on the photon pT is not applied, and or some reason only objects with eta > 1 are kept. From some conversation on the ATLAS MC Generator mailing list, it seems that the problem might be related to the handling of the && operator. If I change the line to:

IdentifiedFinalState photonfs(-2.37,2.37,30.*GeV); // etamin, etamax, ptmin

everything seems to work fine. I'm using rivet 2.2.0 from Athena 19.2.1:

[mdelmast at lxplus0157 Rivet]# which rivet
/cvmfs/atlas.cern.ch/repo/sw/software/x86_64-slc6-gcc47-opt/19.2.1/AtlasSimulation/19.2.1/InstallArea/share/bin/rivet

[mdelmast at lxplus0157 Rivet]# rivet
Rivet 2.2.0 running on machine lxplus0157.cern.ch (x86_64)

Thanks for your help!

Ciao, M.
-- 
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Marco DELMASTRO | phone @ LAPP: +33 4 50 09 17 85
CNRS/LAPP ATLAS | phone @ CERN: +41 76 4 87 86 90
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