Effects of Narrow Width Approximation with and without decay
Hello,
I am trying to evaluate the effects of the NWA in the calculation of the production cross-section as a function of a coupling parameter in the VLQ UFO model I am using, which affects the width of the VLQ. I have read the FAQ (#2442) that explains why one expects a discrepancy in the production cross-section with and without decays adding up to BR=1. However, I would like to ask for some clarifications. Apologies if I am not understanding something trivial.
On the example of FAQ #2442, should I understand that this directive
p p > t t~
(without any decays) uses or has the same effect as the NWA, whereas the directive
p p > t t~, t > w+ b, t~ > w- b~
does not use the approximation? Also, in the former case, do the BR defined by the model play any role?
Regards,
Nik
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