A charged pion & (π‡), an unstable particle of mass 140 MeV/c², is known to decayinto a muon (μ‡, mass 106 MeV/c²) and a neutrino (1; we can treat it as masslesshere). In this decay of pion (→ + ₁), typically only the muon is detected, theneutrino being an electrically neutral particle that rarely interact with other matter.Properties of neutrinos in this decay are inferred from measured properties of pion andmuon. Explain, as conceptually as possible, why it is not possible for a pion to simply decayinto a muon, without an associated neutrino. That is, why is this decay, π → Mt,impossible? (Note: If you happen to know about lepton numbers and neutrino flavors,please give an explanation that does not make use of concepts we have not yet covered.)

The explanation for the above process can be given in terms of the lepton number. Lepton numbers are…

Answered: A charged pion (π), an unstable…

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