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  • An improved search for the electric dipole moment of the τ lepton

    • 등록일
      2022.05.25
    • 조회수
      131

We report a measurement of the electric dipole moment of the τ lepton (dτ) using an 833~fb1 data sample collected near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e collider. Using an optimal observable method, we obtain the real and imaginary parts of dτ as Re(dτ)=(0.62±0.63)×1017 ecm and Im(dτ)=(0.40±0.32)×1017 ecm, respectively. These results are consistent with null electric dipole moment at the present level of experimental sensitivity and improve the sensitivity by about a factor of three.

https://arxiv.org/abs/2108.11543

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