Weak mixing angle in electroweak theory

weakMixingAngle is the Weinberg angle, a parameter describing how electromagnetic and weak interactions arise from electroweak gauge fields.

Meaning

Its sine and cosine enter relations among electroweak couplings and boson masses. Use sin and cos when evaluating a formula expressed in radians, and compare fundamental electromagnetic scales with fineStructure.

Caveats

The precise effective value can depend on energy scale and renormalization convention. Do not treat it as a universal geometric angle; use the stated convention in a source and pow carefully when a formula uses sin²θ.