Add a new model?
Dear MadGraph-authors,
for my Master's thesis I look at the ttgamma process. Unfortunately there is no possibility to unambiguously separate events where the top quark radiates the photon from ISR or b-quarks radiating the photon. To archive this I did a few manipulations (I have some slides describing the changes but I do not see a possibility here to upload them). These manipulations , although neglecting interference terms, did not change the overall distributions as I checked (could be seen in my slides as well). The distributions were later used to feed a neural network to distinguish between events where the photon comes from the top quark and where it comes form ISR, the b quark or the W boson and its decay products.
The question that I was asked now is, whether it makes sense to implement those models (although neglecting interference terms) to make these differentiations in general possible (for example also for W or Z radiation). A possible usage of such models is probing the coupling to the top quark because therefore only events where the top quark radiates the interesting particle are relevant and it is necessary to filter them wrt to ISR, b quarks and W bosons radiating such particles, for instance the photon.
What do you think about this?
Cheers,
Andreas
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