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arxiv: 0710.1368 · v1 · submitted 2007-10-06 · ✦ hep-ex

Measurement of the Tau Lepton Polarisation at LEP2

DELPHI Collaboration , J. Abdallah , et al This is my paper
classification ✦ hep-ex
keywords polarisationmeasurementaboveannihilationaverageconsistentdecaysdetermined
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A first measurement of the average polarisation P_tau of tau leptons produced in e+e- annihilation at energies significantly above the Z resonance is presented. The polarisation is determined from the kinematic spectra of tau hadronic decays. The measured value P_tau = -0.164 +/- 0.125 is consistent with the Standard Model prediction for the mean LEP energy of 197 GeV.

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  1. Polarized tau decay and CP violation in ultraperipheral heavy-ion collisions

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    Proposes that the relative polarization of tau+ and tau- decay products in UPCs, aligned to the magnetic field, provides a sensitive probe for CP violation.