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Jan 11, 2023 at 17:01 comment added David Bailey Welcome to Physics SE. "Coupling constant" is not a uniquely defined term. The question is about $g_W$, not $\alpha_W$, which is itself not uniquely defined. It can be defined as $\alpha_W=\frac{g_W}{4\pi}$, and historically a very different "$\alpha_W$" is sometimes estimated from hyperon decays, which is what I suspect you have done. A problem with this "$\alpha_W$" definition is that every weak decay will give a different value, since low energy weak decay rates depend on the 5th power of the energy released.
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Jan 11, 2023 at 18:08
S Jan 11, 2023 at 13:12 history answered user355516 CC BY-SA 4.0