To write tests for lepton number and baryon number

Is the idea to check with Gell-Mann–Nishijima? Particle instances in QRules only carry quantum numbers, not data like quark content, and they can only be constructed if their numbers agree with NNG. It is probably too strict to implement as a runtime check for the particle package, but we could write an NNG check that is run through the test suite, e.g. for PDG particles.

I was not originally thinking about that, as it would require several new quantum numbers to be added to the code here in Particle. That is not to say that it is totally wild. But it would require some (more) work. What do you think?

In the first instance one would add lepton and baryon numbers for the particles, and would take it from there.

Kindly comment and help out :-).

as it would require several new quantum numbers to be added to the code here in Particle

If the check is implemented in a test, the quantum numbers can be computed from existing data in a Particle instance, see code here. Not sure if it works for all definitions, but should work for most.

Hello @redeboer, you linked above to code from you. Is this something you would like to port to Particle? It could be very neat. It's not a tiny piece of work. I thought I would ask anyway :-).

Yes this could be ported, though parts have to be rewritten for particle's implementation.
I'm tagging @grayson-helmholz, who is currently reworking QRules. Maybe something you could look into? On the road myself the next few weeks

Hi. Sounds cool. Let's keep in touch.

And happy trips to you :)!