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

Inami, K and Giri, Anjan Kumar and Sandilya, Saurabh and et al, . (2022) An improved search for the electric dipole moment of the τ lepton. Journal of High Energy Physics, 2022 (4). pp. 1-17. ISSN 1029-8479

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Abstract

We report a measurement of the electric dipole moment of the τ lepton (dτ) using an 833 fb−1 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) × 10−17ecm and Im(dτ) = (−0.40 ± 0.32) × 10−17ecm, 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. [Figure not available: see fulltext.] © 2022, The Author(s).

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