PDF Informations in Delphes

[muanza]

Hello,

I produced MC samples with Herwig++ and Pythia8 and ran Delphes on their HepMC outputs.

I'd like to apply PDF reweighting to those root-tuples, so I need the usual x1,x2,flav1,flav2,Q² variables. The last one seems to be in the GEN tree whereas for the x's and flav's of the colliding partons I couldn't figure an obvious robust way to identify them for all processes.
Is there a recipe for this?

[Pavel Demin]

Hi Steve,

Is it possible to extract the x1,x2,flav1,flav2,Q² variables using information from a STDHEP common block?

Or should we calculate them from the kinematic parameters of incoming protons and partons?

Here is a basic description of the STDHEP contents:

​http://cmssdt.cern.ch/SDT/lxr/source/SimDataFormats/GeneratorProducts/data/stdhep.inc

Regards,

Pavel

[muanza]

Dear all,

I slightly modified Delphes_V_2.0.2 in order to add the PDF variables cited above into the GEN tree, only for the case of an HepMC input file. I retrieved these variables from the HepMC::PdfInfo class.

Please find hereby attached the 2 modified files.

Best regards, Steve

[muanza]

Delphes_V_2.0.2/Utilities/ExRootAnalysis/interface/BlockClasses.h

[muanza]

Delphes_V_2.0.2/src/HepMCConverter.cc

[muanza]

Dear all,
As far as I'm concerned, this ticket can be closed.

Thanks
Regards, Steve