Batch scanning CoM energy

Asked by Cedric Yu

Hi,

Let's say I am considering m,A->m,A scattering and I'd like to calculate the cross section.
Is there any way where I can scan the parameter space of mass of m (Mm) and also the centre-of-mass energy?

I tried batch file but it seems to only scan parameters, not initial momenta.

Thanks a lot.

Cedric

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CalcHEP Edit question
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Alexander Belyaev
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Alexander Pukhov (pukhov) said :
#1

I don't remember about scan over energy in batch.

In GUI mode for any 2->2 process one can use
      1D integration
            Parameter dependence
                  Pcm
                        'Pcm' min ......
                        'Pcm' max ......
                        Number of points ....

Other way which can applied for any reaction:
      Suppose you have n_calchep compiled in 'results' directory
      Then go to this directory and launch
       ../bin/pcm_cycle
It will inform you which arguments pcm_cycle expects for launching a cycle.

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Best Alexander Belyaev (alexander.belyaev) said :
#2

Dear Cedric,

yes you can use batch to scan energy.

Here are the basic instructions.
Main point -- You can scan over a parameter that is not a model parameter!

 So, for example, you could add the lines:

Run parameter: rtS
Run begin: 7
Run step size: 1
Run n steps: 2

to your batch file even though rtS is not a parameter of the model. (You could name it something different if you like.) Then, the momenta can be made functions of the scan parameters. For example,

p1: 1000*rtS/2
p2: 1000*rtS/2

This will plug the scan value of rtS in and then calculate the value before running CalcHEP.

Regards,
      Alexander Belyaev

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Cedric Yu (cedricyu803) said :
#3

Thanks Alexander Belyaev, that solved my question.