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- Thread starter Oreith
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Conservation of energy. The tau lepton is heavier than the pion.

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ChrisVer

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Then decaying to something that needs at least (for its mass purposes) energy of [itex]E \sim M_\tau \approx 1777 ~MeV [/itex] is impossible.

That's something one has to check everytime he has a decay of the form : [itex] X \rightarrow A_1 + A_2 + ... +A_n [/itex]

That's not though the case of [itex] X+Y \rightarrow N- \text{particles}[/itex]

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