$\tau$ electric dipole moment with polarized beams

Abstract

High luminosity Super B/Flavor factories, near and on top of the ${\rm Y}$ resonances, allow for a detailed investigation of CP-violation in $\tau$ physics. In particular, bounds on the $\tau$ electric dipole moment can be obtained from CP-odd observables. We perform an independent analysis from other low and high energy data. For polarized electron beam a CP-odd asymmetry, associated to the normal polarization term, can be used to set stringent bounds on the $\tau$ electric dipole moment.

Comments: 8 pages, 1 figure, contributed paper to Lepton Photon 2007