few events in certain e+e- radiative return reactions
Hello,
I'm trying to generate e+e- > chi chi via a vector mediator (that can go on shell) using the ISR plugin (https:/
I run into a strange issue where MG5 fails to generate the requested number of events only for the scalar case but not the
fermion model (about a third of the requested events is generated and extremely slowly)
I checked the standard things: there are no explicit cuts on the final state; the couplings are chosen such that the width of the s-channel vector is not tiny (about 1e-3 - 1e-4 of the mass). The cross-sections estimated by MG5 are equal, as expected for a process with an on-shell intermediate state.
Does anyone know how this issue can arise? Thank you!
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