Define the model:

{{{
model = SM
}}}

Define containers for electrons and muons (and photons):

{{{
alias lep = e1:E1:e2:E2
alias prt = lep:A
}}}

The Born process and and additional bremsstrahlung photon, compilation:

{{{
process born = e1, E1 => e2, E2
process rc = e1, E1 => e2, E2, A
compile
}}}