Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle

Authors

K. Uno, Niigata University
K. Hayasaka, Niigata University
K. Inami, Nagoya University
I. Adachi, The Graduate University for Advanced Studies
H. Aihara, The University of Tokyo
D. M. Asner, Brookhaven National Laboratory
H. Atmacan, University of Cincinnati
T. Aushev, HSE University
R. Ayad, University of Tabuk
V. Babu, Deutsches Elektronen-Synchrotron (DESY)
J. Bennett, University of Mississippi
F. Bernlochner, Universität Bonn
M. Bessner, University of Hawaiʻi at Mānoa
V. Bhardwaj, Indian Institute of Science Education and Research Mohali
J. Biswal, Jozef Stefan Institute
A. Bobrov, Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
G. Bonvicini, Wayne State University
A. Bozek, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
M. Bračko, Jozef Stefan Institute

Document Type

Article

Publication Date

10-1-2021

Abstract

Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ± → ℓ±γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B(τ± → μ±γ) ≤ 4.2 × 10−8 and B(τ± → e±γ) ≤ 5.6 × 10−8, are set at 90% confidence level. [Figure not available: see fulltext.].

Relational Format

journal article

Recommended Citation

The BELLE collaboration, Uno, K., Hayasaka, K., Inami, K., Adachi, I., Aihara, H., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Bennett, J., Bernlochner, F., Bessner, M., Bhardwaj, V., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., … Zhukova, V. (2021). Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle. Journal of High Energy Physics, 2021(10), 19. https://doi.org/10.1007/JHEP10(2021)019

DOI

10.1007/JHEP10(2021)019

Accessibility Status

Searchable text