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We have searched for a CP violation signature arising from an electric dipole moment (d τ ) of the τ lepton in the e + e − →τ + τ − reaction. Using an optimal observable method and 29.5 fb −1 of data collected with the Belle detector at the KEKB collider at s=10.58 GeV, we find Re(dτ)=(1.15±1.70)×10−17 ecm and Im(dτ)=(−0.83±0.86)×10−17 ecm and set the...
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