VBF and photon fusion
Hi,
I want to generate a pair of doubly-charged Higgs bosons (h++, h--) at the LHC in the vector boson fusion processes, including photon, W and Z boson-fusion subprocesses.
As I know, if I need the subprocess with only photon fusion, I could do as "a a > h++ h-- " including elastic and inelastic scattering. But I want to include all the fusion subprocesses, namely photon-photon fusion, W boson-W boson fusion, photon-W boson, and so on.
So if I generates events in p p > j j h++ h--. I checked that all Feynman diagrams are included. It is weird that even if I did not impose any cut there was no colliear divergence appearing. So I would like to ask if p p > j j h++ h-- included the contributions from photon fusion?
Besides I found the cross section of p p > j j h++ h-- is unreasonble large even if I impose cuts ptj > 10 GeV. I am not sure what has happened.
I used pdf "nn23lo1" and MG5_aMC_v2_6_5 and MG5_aMC_v2_4_3. I could provide model file for validation if needed.
Thanks very much.
Gang
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