automatic detection of zero couplings

Registered by Olivier Mattelaer on 2011-05-07

in presence of zero couplings we should avoid
1) avoid computation of wavefunctions/amplitudes
2) avoid to run the channel of integration

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Hello Olivier,

Partly, this would be easy enough, but is it really worth it? What are the examples you are thinking about? I would guess you are thinking in particular about using full models with restrictive parameter cards, where e.g. CKM matrix elements are set to 0?

To the extent that ALOHA amplitudes are always multiplied by the coupling, it's easy enough to identify, for all amplitudes, which couplings would render this amplitude zero. We can then simply check, both for the amplitude used for the present channel, and for the diagram (or perhaps, as you suggest, wavefunction) calculation. Note however, that in your combined ALOHA couplings, we will need to check multiple couplings.

(?)

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