The tau weak-magnetic dipole moment

Details The tau weak-magnetic dipole moment The tau weak-magnetic dipole moment

1994-11-14

arxiv.org/abs/hep-ph/9411289v2

Nucl.Phys.B436:474-486,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, Latex, 2 figures

Scientific paper

10.1016/0550-3213(94)00525-J

We calculate the prediction for the anomalous weak-magnetic form factor of the tau lepton at $q^2=M_Z^2$ within the Standard Model. With all particles on-shell, this is a electroweak gauge invariant quantity. Its value is $a_\tau^w (M_Z^2)= - \;(2.10 + 0.61\, i) \times 10^{-6}$. We show that the transverse and normal components of the single-tau polarization of tau pairs produced at $e^+e^-$ unpolarized collisions are sensitive to the real and absorptive parts of the anomalous weak-magnetic dipole moment of the tau. The sensitivity one can achieve at LEP in the measurement of this dipole moment is discussed.

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