Publication: An improved search for the electric dipole moment of the τ lepton
Дата
2022
Авторы
Inami, K.
Hayasaka, K.
Adachi, I.
Aihara, H.
Pakhlov, P.
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© 2022, The Author(s).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.]
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An improved search for the electric dipole moment of the τ lepton / Inami, K. [et al.] // Journal of High Energy Physics. - 2022. - 2022. - № 4. - 10.1007/JHEP04(2022)110