H > W W decay in MadGraph/MadSpin
Hi:
I want to simulate the decay of Higgs to ZZ and WW. Since m_h < 2m_Z/2m_W, if I input the decay chain in MG, I need to give the whole chain like
generate p p > h h, ( h > w+ w-, w+ > l+ vl, w- > l- vl~), ( h > w+ w-, w+ > l+ vl, w- > l- vl~)
which is the 8 final states process, the MG takes long time to give me the required events.
However, I realize I can also use MadSpin to decay the Higgs. I guess the syntax should be for MG
generate p p > h h
and then in MadSpin:
decay h > w+ w-, w+ > l+ vl, w- > l- vl~
The generation of un-decayed events is fast, but still the MadSpin takes time to process all events.
Are these the only two ways to handle such off-shell decay?(Am I doing right for the above methods?) Or there is some other method that I can use to speed up the simulation?
Thanks!
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