Effect of longitudinal electron polarization in the measurement of the τ weak dipole moment in e<SUP>+</SUP>e<SUP>−</SUP> collisions
- Ananthanarayan, B.
- Rindani, Saurabh D.
DOIAbstract
We show that certain CP-odd momentum correlations in the production and subsequent decay of τ pairs in e+e− collisions get enhanced when the electron beam is longitudinally polarized. Analytic expressions for these correlations are obtained when τ+τ− have a "weak" dipole form factor (WDFF) coupling to Z in the case of two-body decay modes of the τ. Expressions of the variance of these correlations due to the standard model interactions are also presented. For e+e− collisions at the Z peak, a sensitivity of about 10−17e cm for the real part of the τ WDFF and 3×10−17e cm for the imaginary part of the τ WDFF can be reached using π and ρ channels (which are the most sens...
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