The standard model is very solidly established, and it tells us what fundamental particles there are. The muon is the most stable negatively charged particle other than the electron; the Xi is about 10000x shorter-lived, and the tau 1000x shorter than that - and even muons aren&#x27;t stable enough to be practical.<p>More importantly, these things are physics rather than chemistry. No amount of chemistry will produce muons from ordinary chemicals, you have to use high-energy radiation. (Admittedly molecular bonds distort electron orbitals a little bit, but nothing like the factor of 200 you get from switching them for muons). If someone had a way to catalyse <i>any</i> kind of nuclear process with chemistry (something as simple as making a radioactive element decay faster) that would be a major breakthrough. To jump straight to the single most useful one would be too much to hope for.