# Integration issue?

Hi,

I used WO to calculate the following SM processes: gamma e- > gamma e-, gamma e- > gamma gamma e-, gamma e- > e- e+ e-, and gamma e- > gamma e- e+ e-, see typical Sindarin script used. For some of the channels mentioned earlier, the cross-section value deviates a lot from one simulation to another. My understanding is when there is a large deviation in the cross-section calculation, it means the integration is diverging, the remedy is usually to apply pseudo-rapidity cuts to remove the extreme backward and forward angles where usually the integration is diverging. However, the extreme angles are the region where my detectors are placed and where the bulk of the signal is. Is there an alternative solution to pseudo-rapidity cuts to make converging the integration?

Thanks, cheers,

Igal.

Typical Sindarin script used:

# WHIZARD SINDARIN script for LEPS (II) & GlueX setups

# This is the generic WHIZARD SM

model = SM

seed = 2176003

process ae_to_aeee_

iterations = 8:20000,3:40000

compile

!!! Tests can be run multi-threaded

! openmp_num_threads = 4

beams = "gamma", "e-"

beams_momentum = 11000 MeV, 0 MeV

integrate (ae_to_

n_events = 1000

sample_format = lhef

simulate (ae_to_

## Question information

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- Juergen Reuter Edit question

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