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I'm just starting out with simple particle physics, and I'm doing a ton of exercises where I have to check if a certain reaction is allowed, from the point of lepton/baryon/energy conservation and such. Now in principle I am able to figure most of it out of course, as it's simply checking a few numbers and whatnot, but from time to time I'm asked to 'add' the missing particles to the equation, and I'm not always sure if my answer is sensible.

Now, as I'm doing approximately 40 of these exercises posting them here and asking if they are sensible is neither time-efficient nor very useful for anyone other than myself, so I was wondering if there's something out there such as a simple tool that checks if the conservation laws are obeyed. Something where you'd say I begin with an antitau and I end up with a tau neutrino, an antimuon and a mu neutrino, and it'll tell you yes this is possible, or no this or that conservation law is not satisfied. I'm assuming something like this should be relatively simple to make (as it simply has to know a few particles and count some numbers), but I haven't been able to find one as of yet. Does anyone know if one exists?

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