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.]

An improved search for the electric dipole moment of the τ lepton / Inami, K., Hayasaka, K., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Bessner, M., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Bracko, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2022:4(2022). [10.1007/JHEP04(2022)110]

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

Campajola M.;De Nardo G.;Di Capua F.;Merola M.;Russo G.;
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.]
2022
An improved search for the electric dipole moment of the τ lepton / Inami, K., Hayasaka, K., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Bessner, M., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Bracko, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2022:4(2022). [10.1007/JHEP04(2022)110]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/938554
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