WHIZARD

isr and beamstrahlung in lepton collider

Asked by Yehia Abdelaziz

I am trying to generate events in ee collider while implementing isr and beamstrahlung for the ilc.

The problem is that after WHIZARD run, I look at the lhe file but I don't see any photons. Why is that? Shouldn't the photon that is radiated from the electrons appear in the lhe file?

Question information

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

Hi Yehia,
1) the beam remnant from the beam spectrum is never included in the event, in agreement with the demands of the experimental collaborations. The collision just happens at a lower energy.
2)
A bit counter-intuituve, you need to set both
?keep_beams = true
to keep the photons in the event file. Note that they are strictly collinear, unless you switch the ISR pT treatment on by
?isr_handler = true
$isr_handler_mode = "recoil"
Cheers,
   JRR

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

We mark this as solved. Should you have some other problem, please open a new question.