Tau weak dipole moments from azimuthal asymmetries

Details Tau weak dipole moments from azimuthal asymmetries Tau weak dipole moments from azimuthal asymmetries

1998-12-15

arxiv.org/abs/hep-ph/9812373v1

Nucl.Phys.Proc.Suppl. 76 (1999) 221-228

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the TAU'98 Workshop, September 1998, Santander, Spain. 8 pages, 2 figures

Scientific paper

10.1016/S0920-5632(99)00471-5

We show that transverse and normal single-$tau$ polarization of $tau$ pairs produced at $e^+$ $e^-$ unpolarized collisions, at the $Z$ peak, are sensitive to weak (magnetic and electric) dipole moments of the $tau$. We also show how these components of the $\tau$ polarization are accessible by measuring appropriate azimuthal asymmetries in the angular distribution of its decay products. Sensitivities of the order of $10^{-18}$ $e\cdot cm$, for the weak-electric dipole moment, and $10^{-4}$ ($10^{-3}$), for the real (imaginary) part of the weak-magnetic dipole moment of $\tau$, may be achieved. Compatible bounds are also presented from spin-spin correlated asymmetries.

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