PHOTOS is a MC event generator which implements radiative corrections for different processes. Effectively, corrections are implemented in the leading log approximation. PHOTOS has been developed by Zbignev Was and his collaborators.

1. clone STNTUPLE
2. git clone mu2egpvm01.fnal.gov:/mu2e/app/users/murat/git/mc.git
3. export STNTUPLE_MC_GEN=1
4. run scons to build everything
5. make sure lib/libmc_photos.so is loaded into the ROOT session (can modify rootlogon.C to do that automatically)
6. to generate electron and photon spectra dor DIO in Al, run a stnana job

stnana("photos","","","","photos(4,1)",10000)

• see more details in Stntuple/ana/scripts/photos.C. Current PHOTOS jobs are specified in mc/photos/TPhotos.cc (TPhotos::Test*() functions)