Mismatch between cross-sections in different mg5 version
Dear mg5 author,
I am getting a mismatch between the results obtained in two different versions of mg5. Cross section using MG5_aMC_v2_9_2 is 144 fb and using MG5_aMC_v2_7_3 (and also in MG5_aMC_v2_6_7) is 128 fb. I am using the same parameters for both runs.
The process I generate is e- pb > pb n1, which is mediated by a scalar Leptoquark and also by W boson. Here pb = p b b~, n1 is a gauge singlet right handed neutrino. The difference is there for W mediated channels. Even if the coupling at W-e-n1 vertex is switched off the contribution from this W mediated channel is non-zero for MG5_aMC_v2_9_2 . Whereas, for MG5_aMC_v2_7_3 it is zero. The result of MG5_aMC_v2_9_2 is not reasonable.
Is anything wrong with MG5_aMC_v2_9_2 ? Or I am missing something?
It will be helpful if I can get any suggestions from your side. Thank you very much.
regards,
rojalin
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