MadGraph5_aMC@NLO

Finding Parton distribution functions from lhe file generated from Madgraph

Asked by Gagandeep Singh

Is there a way to find structure functions and Parton Distribution functions using the .lhe file generated by Madgraph for the event
generate p p > p p e- e+ ve ve~
launch

Please help!

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

I do not understand your question.
The parton distribution used to generate the event is indicated before the first event. (in the <init> block)

Cheers,

Olivier

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Gagandeep Singh (gagan45arora) said : 		#2

How is exactly is the whole distribution defined? In the init block, i see just a few numbers as shown below from .lhe file

<init>
2212 2212 6.500000e+03 6.500000e+03 0 0 247000 247000 -4 1
3.994046e-03 1.147838e-05 3.994047e-03 1
<generator name='MadGraph5_aMC@NLO' version='2.9.13'>please cite 1405.0301 </generator>
</init>

If it's already defined what meaningful quantities can we derive from p p collision events?

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

So this means that you use pdf set 247000
Which like for all PDF can be found here:
https://lhapdfsets.web.cern.ch/current/

I knew that they are also tools online to plot various distribution related to the PDF/...

> If it's already defined what meaningful quantities can we derive from p p collision events?

We can not extract it from a lhe file, but those PDF are extracted from data (and theory).

Cheers,

Olivier

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