# Magnetic Moment of the Tau Lepton

1. Jan 30, 2004

### joecoss

Has the value of the Magnetic Momentic of the Tauon been determined experimentally in Units of Joules/Tesla? I have seen these values for the Electron and Muon. Thanks.

2. Feb 4, 2004

### Orion1

Bohr Magneton...

Bohr Magneton:
$$\mu = \frac{q \hbar}{2m}$$

The value of the magneton is mass and charge dependent for any nuclear particle, however I prefer the energy and charge dependent equasion version:

$$\mu = \frac{q \hbar c^2}{2E}$$

Lepton Magneton Moments:
$$\mu_\beta = 9.274*10^-24 J*T^-1$$
$$\mu_\mu = 4.483*10^-26 J*T^-1$$
$$\mu_\tau = 2.656*10^-27 J*T^-1$$

Due to the extremely short Tau lifetime ~<4*10^-13 s, this makes an experimental measurement extremely difficult and unlikely to disagree with this theory with any great uncertainty.

Last edited: Feb 4, 2004