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.]

Original languageEnglish
Article number110
JournalJournal of High Energy Physics
Volume2022
Issue number4
DOIs
Publication statusPublished - Apr 2022

Keywords

  • e-e Experiments
  • Tau Physics

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY

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