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EvtGenDirec/PHOTOS [message #22633] Tue, 22 May 2018 13:57 Go to previous message
Alaa Dbeyssi is currently offline  Alaa Dbeyssi
Messages: 16
Registered: June 2012
occasional visitor
From: *emp.him.uni-mainz.de
Hi,

I am generating the process ppbar->e+e- using EvtGenDirect and switching on PHOTOS (release Dec17p1, macros from /pandaroot/macro/run, p=1.5 GeV).
It seems that PHOTOS is not working properly here since the invariant mass of the e+e- is alway equal to the theoretical value 2.254 GeV (no radiative tail and no photon emission). There is also warning from PHOTOS:

WARNING from PHOTOS: "Momentum not conserved in the vertex". The log file is attached. By switching on PHOTOS, means I don't write "noPhotos" in the decay file. Is this correct?

thank you for your help.
Alaa
///////////////////
The decay file is:

Decay pbarpSystem
1.0 e+ e- PHSP;
Enddecay

End
///////////////////
 
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