[Rivet] Question concering PromptFinalState projection

[Dominic Hirschbuehl]

Dear all, 

I have a question concerning the PromptFinalState projection.
I did a study on acceptences of lep+jets ttbar events, where I found an
unexpected differences between Powheg+Pythia6 and Powheg+Herwig samples.
The differences occured already on the level of the lepton acceptance,
which includes a dilepton veto.

After some investigation I have the suspicion, that leptons from hadron
decays are counted as prompt leptons.

Looking to the actual implementation of isPrompt I found this line of code:
if (ancestor->status() != 2) continue; // no non-standard statuses or
beams to be used in decision making

Is there a reason to restrict the status codes to 2?
If I print out all ancestors of a "prompt lepton" from a Herwig showered event
I get:

    pdg = 2212 status = 101 0 1
    pdg = 2212 status = 102 0 1
    pdg = 21 status = 121 1 0
    pdg = 21 status = 122 1 0
    pdg = 6 status = 123 1 0
    pdg = 6 status = 143 1 0
    pdg = 6 status = 3 1 0
    pdg = 6 status = 155 1 0
    pdg = 24 status = 123 0 0
    pdg = 24 status = 3 0 0
    pdg = 24 status = 155 0 0
    pdg = 4 status = 124 1 0
    pdg = 4 status = 144 1 0
    pdg = 4 status = 2 1 0
    pdg = 21 status = 2 1 0
    pdg = 4 status = 158 1 0
    pdg = -2 status = 158 1 0
    pdg = 91 status = 183 0 0
    pdg = 411 status = 197 0 1

which would indicate that the identified lepton actually comes fomr a
hadron.

Do I miss something?

Thanks in advance
  Dominic


-- 
 /---------------------------------------------------------------------\
|                     Dr. Dominic Hirschbuehl                           |
 \   Bergische Universitaet Wuppertal - Exp. Elementarteilchenphysik   /
 /  hirsch at physik.uni-wuppertal.de / dominic.hirschbuehl at cern.ch       \             
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