Full number of events not generated
Hi,
1) I am using a model file having an anomalous Higgs vertex, h-b-bbar-gamma (from a higher dimensional operator) in Madgraph.
I am using it to simulate a a > b b~ b b~ in e+ e- collider using the following switch:
3 = lpp1 ! beam 1 type
3 = lpp2 ! beam 2 type
When I set the BSM coupling parameters to zero and demand , say 50000 events in generation, I get all the points generated. But when I set the BSM parameters to some non-zero but high values, I get only around ~900 points generated. This gets corrected when I reduce the value of the BSM parameters.
I initially thought that less number of events generated means some singularities in the phase space, which Madgraph skips when generating events. But I have ptj, ptb > 20 GeV and delta_R > 0.4 cuts in run card. So I cannot understand what could be the problem Could you please help with the same ?
2) On a related subject, if i am not wrong, the switch 3 in the above setting refers to effective photon approximation. But is there a way to change the run card to simulate a back scattered photon in a "photon collider" ?
thanks and regards
Siddharth
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