Information about calculation of the cross setion in Whizard

Asked by Evgeny

Dear Whizard support,

Is it possible to get information about how the cross section is calculated for various processes in Whizard ?

Suppose I study the process "e+ e- -> N1 ve" using SM_HeavyN_NLO model:

model = SM_HeavyN_NLO (ufo)

mN1 = 500 GeV

process eE_N1ve = em, ep => N1, ve

compile

sqrts = 800 GeV

beams = em, ep

integrate(eE_N1ve) {iterations = 10:100000}

And I get the corresponding values of Integral[fb] and Error[fb]:

| Starting integration for process 'eE_N1ve'
| Integrate: iterations = 10:100000
| Integrator: 3 chains, 3 channels, 2 dimensions
| Integrator: Using VAMP channel equivalences
| Integrator: 100000 initial calls, 20 bins, stratified = T
| Integrator: VAMP
|=============================================================================|
| It Calls Integral[fb] Error[fb] Err[%] Acc Eff[%] Chi2 N[It] |
|=============================================================================|
   1 95256 3.0990073E+04 6.40E+00 0.02 0.06* 11.02
   2 95256 3.0999645E+04 6.38E+00 0.02 0.06* 11.02
   3 95256 3.0988672E+04 6.35E+00 0.02 0.06* 11.02
   4 95256 3.0987977E+04 6.33E+00 0.02 0.06* 11.02
   5 95256 3.0987538E+04 6.40E+00 0.02 0.06 11.02
   6 95256 3.1007277E+04 6.26E+00 0.02 0.06* 11.02
   7 95256 3.0997888E+04 6.49E+00 0.02 0.06 11.02
   8 95256 3.0991739E+04 6.32E+00 0.02 0.06* 11.02
   9 95256 3.0998517E+04 6.42E+00 0.02 0.06 11.02
  10 95256 3.0991267E+04 6.47E+00 0.02 0.06 11.02
|-----------------------------------------------------------------------------|
  10 952560 3.0994084E+04 2.02E+00 0.01 0.06 11.02 1.05 10
|=============================================================================|

So, is there a toolkit that allows you to see the calculations of these quantities themselves?

Thanks and all the best,

Evgeny

Question information

Language:
English Edit question
Status:
Solved
For:
WHIZARD Edit question
Assignee:
Juergen Reuter Edit question
Last query:
Last reply:
Revision history for this message
Juergen Reuter (j.r.reuter) said :
#1

Dear Evgeny,
I'm sorry to say that I didn't get your question: do you want to understand how a Monte Carlo event generator in general works?
Please take a look at the manual and at general literature, and then maybe ask more concrete questions.
Best,
    JRR (Juergen)

Revision history for this message
Juergen Reuter (j.r.reuter) said :
#2

Marking as solved for the moment. Please open a new issue in case you have a more concrete question.