[Rivet] accessing HepMC/PdfInfo.h from a rivet analysis

[stefania spagnolo]

Dear all, 
I'm running a rivet analysis on hepmc files produced with aMC at NLO  and showered with Herwig++; I need to retrieve some extra info written in the lhe original file which are not propagated to the hepmc format. The problem I have is that the hepmc file misses a few events (parton shower failure while running, I guess) and therefore I need to make sure I'm associating the correct lhe event to the hepmc event. 

Therefore, I'd like to retrieve some special event info from the hepmc event header; in particular I've the impression that the pdfScale of the event might be useful ... 

In my hepmc file this is the 4th word in the Event header row: 

E 3 -1 2.8168094000000000e+01 1.4036799198303040e-01 7.6616229391653504e-03 0 -1 245 10003 10007 0 1 1.0000000000000000e+00

And in the lhe file I can easily find it again in the event header: 

  <event>
  6     66 0.70177165E-03 0.28168094E+02 0.79577472E-01 0.11965156E+00

Cross checking the value, might allow to make sure I'm reading  the same event from the two files (hepmc and lhe). 

So the question: 
How can I access the PdfInfo object from the hepmc event in the analyze method of a rivet analysis ? 
I've tried to browse the code without much success ... 

Thanks for any suggestion, 
Cheers, 
Stefania 


Stefania Spagnolo
----------------------------------------------------------------------------------------------
 Sezione INFN di Lecce 
 Dip. di Matematica e Fisica "Ennio DeGiorgi", Univ. del Salento 
 Phone:  +39 0832 297439
 http://www.dmf.unisalento.it/~spagnolo/ 
 ATLAS experiment 
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