Production of Polarized tau Pairs and Tests of CP Violation Using Polarized e+e- Colliders Near Threshold

Abstract

We consider the production of tau pairs by electron-positron colliding beams at the maximum cross section near the threshold. At this energy tau pairs are produced mostly in the s-wave which implies that the spin of the tau pairs are almost always pointing in the beam direction independent of the production angle. When both electrons and positrons are longitudinally polarized in the same direction, for example 90%, one can obtain tau pairs with 99% polarization in the direction of the polarization vectors of the incident beams. Tests of CP violation and study of the structure of weak interactions using such polarized tau pairs are discussed.

30 pages, 5 figures, uuencoded file, SLAC-PUB-6685

References in corpus (1)

• Weak dipole moment of $\tau$ in $e^{+}{e}^{-}$ collisions with longitudinally polarized electrons

Cited by in corpus (20)

• Flavour physics of leptons and dipole moments
• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Maximizing Spin Correlations in Top Quark Pair Production at the Tevatron
• Tau Polarization Asymmetry in $B\to X_s{\tau }^{+}{\tau }^{-}$
• CP Violation in Semileptonic $\tau$ Decays with Unpolarized Beams
• P and T Odd Asymmetries in Lepton Flavor Violating Tau Decays
• Probing Top-Quark Couplings at Polarized NLC
• What can we learn about light-meson interactions at electron-positron colliders?
• CP Violation in $\tau \to 3\pi {\nu }_{\tau }$
• Can the observed CP asymmetry in tau --> K pi nu_tau be due to Non-Standard Tensor interactions?
• Measurement of the $\tau$ electric dipole moment using longitudinal polarization of $e^{+}{e}^{-}$ beams
• Search For Non-Standard Model CP/T violation At Tau-Charm Factory
• Searching For Anomalous $\tau \nu W$ Couplings
• Search for CP Violation in $\tau \to \pi {\pi }^0{\nu }_{\tau }$ Decay
• A new method for measurement of the Michel parameters that describe the daughter muon polarization in the ${\tau }^{-}\to {\mu }^{-}{\bar{\nu }}_{\mu }{\nu }_{\tau }$ decay
• Effective CP-violating operators of the tau lepton and some of their phenomenologies
• Feasibility study of $CP$ Violation in ${\tau }^{-}\to K_S{\pi }^{-}{\nu }_{\tau }$ decays at Super Tau Charm Facility
• Sensitivity study of the charged lepton flavor violating process $\tau \to \gamma \mu$ at STCF
• Polarized tau decay and CP violation in ultraperipheral heavy-ion collisions
• Mass effect in polarization investigation at BEPC/BES and the B-factory