ComPWA/qrules

Implement CKM matrix functionality

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spflueger commented

Adding the CKM matrix can help in two ways:

  1. Rules for flavor changing can be implemented, allowing for example a c -> s or c -> d transition but not c -> u. This can help to identify how many weak interaction vertices are actually in calculate a decay strength accordingly. It could also be considered working more on a quark content level.

  2. Implementing the CKM matrix itself can help to calculate strengths more precisely, for example b -> c >> b -> u.

This is motivated by PR ComPWA/expertsystem#202