CP violation and electric-dipole-moment at low energy $\tau$ production with polarized electrons

Abstract

The new proposals for high luminosity B/Flavor factories, near and on top of the ${\rm Y}$ resonances, allow for a detailed investigation of CP-violation in the $\tau$-pair production. In particular, bounds on the tau electric dipole moment can be obtained from genuine CP-odd observables related to the $\tau$-pair production. We perform an independent analysis from low energy (10 GeV) data by means of linear spin observables. We show that, for a longitudinally polarized electron beam, a CP-odd asymmetry, associated to the normal polarization term, can be measured at these low energy facilities both at resonant and non resonant energies. In this way, stringent and independent bounds to the tau electric dipole moment, which are orders of magnitude below other high or low energy bounds, can be obtained.

arXiv comment12 pages, 2 figures

References in corpus (11)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Search for the Electric Dipole Moment of the tau Lepton
• One-loop Effective Lagrangian for a Standard Model with a Heavy Charged Scalar Singlet
• Improved Bounds on the Electromagnetic Dipole Moments of the Tau Lepton
• Model independent bounds on the tau lepton electromagnetic and weak magnetic moments
• Tau Kinematics from Impact Parameters
• The tau weak-magnetic dipole moment
• A Search for the Electric Dipole Moment of the Tau-Lepton
• Measurement of the $\tau$ electric dipole moment using longitudinal polarization of $e^{+}{e}^{-}$ beams
• CP violation and electric-dipole-moment at low energy tau-pair production

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• Search for the Electric Dipole Moment and anomalous magnetic moment of the tau lepton at tau factories
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• Probe of electromagnetic moments of the tau lepton in gamma-gamma collisions at the CLIC
• Tau spin correlations and the anomalous magnetic moment
• The electric dipole moment of the tau lepton revisited
• Effective Lagrangian approach to fermion electric dipole moments induced by a CP--violating $WW\gamma$ vertex
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• Spin correlations in $\tau$-lepton pair production due to anomalous magnetic and electric dipole moments
• Light new physics and the $\tau$ lepton dipole moments: prospects at Belle II
• Constraining EDM and MDM lepton dimension five interactions in the electroweak sector
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