MadGraph5_aMC@NLO

Higgs production in association with bottom quarks

Asked by Fethou

Dear experts,

Hi. Excuse me for my naive questions but i am new on MadGraph and particle physics!!
I want to obtain some results which are in this article http://arxiv.org/abs/1409.5301 , so after creating the model (thank's to the authors who helped me) i am now ready to launch processes. My problem is to put the right parameters as the parameter "alpha" which is described on page 12...How or where can i put it??
I think that i will have more questions after.
Thank's in advance.

Kind regards,

Fethou.

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Rikkert Frederix Edit question
Solved by:
Rikkert Frederix
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Best Rikkert Frederix (frederix) said : 		#1

Hello,

you can adjust the alpha parameter by changing the file
Subprocesses/madfks_mcatnlo.inc

The default (alpha=1) would be

c Define lower and upper veto range (see MC subtraction terms)
      double precision frac_low,frac_upp
      parameter (frac_low=0.1d0)
      parameter (frac_upp=1.0d0)

now you can multiply frac_low and frac_upp by alpha and change their
respective values:

e.g. alpha=1/4:

c Define lower and upper veto range (see MC subtraction terms)
      double precision frac_low,frac_upp
      parameter (frac_low=0.025d0)
      parameter (frac_upp=0.25d0)

VERY IMPORTANT NOTE: after changing an include file you have to remove all
object files, either by hand or by typing "make clean" in the process folder
(which is the safest way).

Best regards,
Rikkert

Revision history for this message
Fethou (fethou-shinigami) said : 		#2

Thanks Rikkert Frederix, that solved my question.