Weak mixing angle = 0.223 05 (dimensionless)

Value
0.223 05
Unit
(dimensionless)
Uncertainty
0.000 23
Copy-ready
0.22305

The weak mixing angle, quoted as sin²θ_W: how the electromagnetic and weak forces mix in the electroweak theory.

A core Standard Model parameter, measured at colliders and in parity-violation experiments.

NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.

Electrical, thermal and X-ray constants

Angstrom starConductance quantumCopper x unitElectron charge to mass quotientFermi coupling constantFirst radiation constantHartree energyJosephson constantLattice parameter of siliconLattice spacing of ideal Si (220)Loschmidt constant (273.15 K, 101.325 kPa)Magnetic flux quantumMolar mass constantMolar mass of carbon-12Molar Planck constantMolar volume of siliconMolybdenum x unitNeutron-proton mass differenceProton charge to mass quotientQuantum of circulationSackur-Tetrode constant (1 K, 101.325 kPa)Second radiation constantVon Klitzing constantWeak mixing angleWien frequency displacement law constantW to Z mass ratio

Link to or cite this value

Link from a web page

Plain HTML for any page that accepts markup.

<a href="https://usephysics.com/reference/weak-mixing-angle">Weak mixing angle — 0.223 05 (dimensionless) — UsePhysics</a>

Link from Markdown

For READMEs, wikis and notes.

[Weak mixing angle — 0.223 05 (dimensionless) — UsePhysics](https://usephysics.com/reference/weak-mixing-angle)

Cite it in a document

Replace [date] with the day you consulted the page. The line credits NIST/CODATA for the values.

UsePhysics. "Weak mixing angle — 0.223 05 (dimensionless)." UsePhysics.com. https://usephysics.com/reference/weak-mixing-angle. Value from the 2022 CODATA adjustment (NIST). Accessed [date].

All physical constants

Constants and formula sheetElectrical, thermal and X-ray constantsAll calculators