An improved search for the electric dipole moment of the τ lepton
Department
Physics
Document Type
Article
Publication Date
4-1-2022
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.]
Journal Title
Journal of High Energy Physics
Journal ISSN
1029-8479
Volume
2022
Issue
4
Digital Object Identifier (DOI)
10.1007/JHEP04(2022)110
COinS