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

[Frank Siegert]

Hi Stefania,

I understand you have already managed to get to the HepMC event with
the Rivet::Event::genEvent() method:
http://rivet.hepforge.org/code/dev/a00236.html#a57dbce8fdc74bca2487f624010724272

>From there it's a matter of HepMC to get to the PdfInfo. The function
you want is HepMC::GenEvent::pdf_info(), cf. line 234ff here:
http://svnweb.cern.ch/world/wsvn/hepmc/trunk/HepMC/GenEvent.h

Hope that helps,
Frank


On 17 February 2014 20:09, stefania spagnolo
<stefania.spagnolo at le.infn.it> wrote:
>
> 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
> ----------------------------------------------------------------------------------------------
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>  Dip. di Matematica e Fisica "Ennio DeGiorgi", Univ. del Salento
>  Phone:  +39 0832 297439
>  http://www.dmf.unisalento.it/~spagnolo/
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