TAU LEPTON PHYSICAL ADMISSIBILITY UNDER ENFORCED MECHANISM CRITERIA

This paper evaluates whether the tau lepton qualifies as an independently enforcing physical mechanism under a strict mechanism-only admissibility criterion. By excluding decay statistics, detector inference, and theoretical formalism, the analysis isolates enforcement to direct physical properties: mass, inertia, electric charge, energy exchange, momentum exchange, and reciprocal back-reaction in spacetime. Applying elimination by necessity, the paper shows that physical evolution is not invariant under removal of the tau lepton, establishing that enforcement occurs while the tau exists regardless of its instability. The result classifies the tau lepton as a physically admissible enforcing entity on the same mechanical grounds as the electron and muon, completing the charged lepton sector under enforced physical criteria.