Fermi coupling constant
Try it yourself:
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fermiCoupling
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fermiCoupling sets the scale of weak interactions in low-energy particle physics.
It is used in beta-decay and weak-process formulas, where natural-unit conventions are common. Check the unit system and relate energy scales to planckConstant only with a consistent formulation.
Enter fermiCoupling on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.
The example above is editable, so you can replace surrounding values and test the constant in your own formula. Browse all constants to compare related values and notation.