Can a Feynman diagram end with more matter than it began with? The answer should be no because it would break the law of conservation of mass, right?
Example: I learned that two up-quarks could interact to create a Higgs boson (via what I learned as "vector fusion"). If this new Higgs were to decay into an up-quark pair, wouldn't the new up-quark be able to interact with the old one to produce another Higgs, creating a potentially infinite amount of particles?
I'm new to this site (and physics), so if this is unclear, please comment.
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