How to remove a channel of a process in batch mode

Asked by Marco Mancini

Hi,

I would like to compute the cross-section of the s-channel bhabha scattering in batch mode scanning on the invariant mass. How can I remove the t-channel process and, successively, the interference term by the squared diagrams?

thank you in advance,
marco.

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Marco Mancini (marcomancini35) said :
#1

Hi, is there someone around? I still need an help 😅
Thank you so much!

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Alexander Pukhov (pukhov) said :
#2

I propose to use the  par_scan program

In this case you can  configure  diagrams  using   interactive (GUI)
mode. In particular the

"Exclude  diagram with"

option can help you  to remove unwanted diagrams. Then you have to
compile n_calchep and set  all needed parameters for numerical session:

the number of MC calls, histograms, structure functions and so not.
Then  you have to prepare input file for par_scan. See
https://arxiv.org/pdf/1207.6082.pdf page  27.

Then you  call

   ../../bin/par_scan  < your_input_file > out_put_file

I hope it will  help

      Best

        Alexander Pukhov

On 6/9/23 11:35, Marco Mancini wrote:
> Question #706830 on CalcHEP changed:
> https://answers.launchpad.net/calchep/+question/706830
>
> Marco Mancini posted a new comment:
> Hi, is there someone around? I still need an help 😅
> Thank you so much!
>

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Alexander Belyaev (alexander.belyaev) said :
#3

Dear Marco,
apologies for the late reply.

As alexander Pukhov said, you can do this using by selecting diagrams at the numerical stage in the graphical mode.
You can exclude any diagrams you want before or after squaring
and then use
 ../../bin/par_scan < your_input_file > out_put_file

to scan over parameters of the model

../../bin/pcm_cycle to scan over the energy

Best
Alexander Belyaev

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