Tau Compton wavelength = 6.977 71 × 10⁻¹⁶ m

Name: Tau Compton wavelength — CODATA 2022 value
Creator: NIST

Value: 6.977 71 × 10⁻¹⁶
Unit: m
Uncertainty: 0.000 47 × 10⁻¹⁶
Copy-ready: 6.97771e-16

Compton wavelength of the tau, λ = h/(mc): the wavelength of a photon whose energy equals the particle's rest energy.

Below this length the particle cannot be treated as a classical point; it also sets the wavelength shift in Compton scattering. The reduced form ƛ = λ/2π is listed beneath.

The same quantity, other ways NIST lists it

Quantity (NIST name)	Value	Unit	Uncertainty
Reduced tau Compton wavelength	1.110 538 × 10⁻¹⁶	m	0.000 075 × 10⁻¹⁶

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

Compton wavelengths, radii and cross sections

Alpha particle rms charge radius Deuteron rms charge radius Muon Compton wavelength Neutron Compton wavelength Proton Compton wavelength Proton rms charge radius Tau Compton wavelength Thomson cross section

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UsePhysics. "Tau Compton wavelength — 6.977 71 × 10−16 m." UsePhysics.com. https://usephysics.com/reference/tau-compton-wavelength. Value from the 2022 CODATA adjustment (NIST). Accessed [date].