Changing BW cutoff to include off shell W-bosons
Dear Olivier,
I am trying to produce a sample of events containing tribosons, specifically WWW. I would like to include the Higgs mediated mode of WWW production (WH, H -> WW). For this, I need to change the BW cutoff from the standard value of 15 to 40 or so. A plot of the variation of the BW cutoff showing the gradual inclusion of the off-shell W’s from the Higgs mediated mode can be seen here: http://
As the BW cutoff is increased the cross section also increases and I obtain a value of the cross section consistent with the LO prediction (the k-factor is large ~1.9, so within some tolerance the cross section also makes sense). However, I encounter a problem when I the set the BW cutoff to 40. For these values, the rate of event generation is slow and Madgraph produces 73 events when the requested number of events is 10k. For BW cutoff < 40, Madgraph produces 10k events as requested. I have also tried producing a gridpack and after several tries, I get higher numbers of events than regular event production but the rate of event generation remains very slow. I used MG5 2.6.7. Is there a way to solve this problem? I think for this purpose, the ability to set BW cutoff to 40 or a slightly higher value (not more than 50 based on the W width) should be sufficient.
Looking forward to your feedback.
Thanks so much!
Sapta
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