CalcHEP

subproc_cycle script

Asked by NADY

Hi,
If I generate a subprocess by CALCHEP and I want to generate the events of this process by using the script
subproc_cycle lumi nmax
The question is:
Are the results be the same when I using Monte Carlo simulation Menu or there is a difference?
You advice me by using Montcarlo Simulation menu or using scripts?
The 2nd question here is What the appropriate value of lumi parameter When I study the process of LHC and Tevatron
and what is the default value of lumi in CALCHEP if I do not write the value of this parameter?
With Best Regards,
Nady Bakhet

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Neil Christensen (neil-christensen-qft) said : 		#1

Dear Nady,

The script subproc_cycle does the same thing as in the graphical interface with whatever settings you have set it up with or with the default settings if you have not run it yet.

I suggest you get comfortable using the graphical interface first and then use the scripts when you become more expert.

There is no default value for the luminosity and you need to learn the luminosity of the experiments to begin to get an answer for this. But, beware that for some processes, this luminosity may give too many events. While, for others, it may not give enough events to reach a stable result. So, it requires a little trial and error and experience to become comfortable with this.

Best wishes,
Neil

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NADY (nady-bakhet) said : 		#2

Dear Neil
Exactly as you said:
" this luminosity may give too many events. While, for others, it may not give enough events "
once I get many events and once no events"
so I had a doubt and I asked you for the apro. value of lum. for LHC and Tevatron
I do not understand the Grid Freeze grid clear grid and event cubes
can you give me short notes about these items to I can use the Monte Carlo Menu instead subproc_cycle?
Many thanks.
Nady

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Neil Christensen (neil-christensen-qft) said : 		#3

Please see:

http://inspirehep.net/record/1123804

for details about the grid. In particular, whether to freeze the grid is explained in Section 4.7.

Best wishes,
Neil

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Alexander Belyaev (alexander.belyaev) said : 		#4

Dear NANDY,
did it clarify your problem?
Cheers,
Sasha

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