Registry · Theorem
IV.T135
tau-effective
formalized
IV.T135 — Fermi Form w-Independence
The Fermi form for neutron lifetime has 6 ingredients (G_F, m_n, V_ud, g_A, f, delta_R), none of which is w=M_W/m_n. The 250 ppm w gap does not propagate to physical observables.
Book IV
Part 4
Ch. 35