This quantity multiplied by the fine structure constant gives the classical electron (*) radius.
The amplitude of Zitterbewegung oscillations is equal to this value. Considering an object for which this parameter is equal to the Schwarzschild radius is the first step in the derivation of the Planck mass. The square of the inverse of the reduced form of this quantity multiplies the wavefunction in one term of the Klein-Gordon equation. Vacuum polarization occurs over a region defined by this quantity, and therefore this quantity gives the scale over which quantum field theory is applicable. This quantity multiplied by the fine structure constant gives the classical electron (*) radius. Computing this value for the W boson gives the length scale over which the weak force can act. This quantity is equal to h over mc and is the region of space over which a particle can be localized. For 10 points, name this quantity which is multiplied by quantity one minus cosine theta to determine the shift when photons bounce off electrons in a namesake type of scattering.
The amplitude of Zitterbewegung oscillations is equal to this value.
Compton wavelength