Y. Ushiroda

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M. Iwasaki

RIKEN

L. E. Piilonen

Virginia Tech

A. Ishikawa

High Energy Accelerator Research Organization

H. Aihara

The University of Tokyo

J. S. Lange

University of Giessen

B. Yabsley

University of Sydney

M. Watanabe

Fukuoka University

T. Kawasaki

Yokohama Municipal Minato Red Cross Hospital

T. E. Browder

University of Hawaiʻi at Mānoa

K. Trabelsi

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

Cooperative Institutions

Campbell Collaboration

162

University of the Basque Country

133

High Energy Accelerator Research Organization

121

University of Cincinnati

109

Chonnam National University

University of Bonn

Duke University

Korea Institute of Science & Technology Information

Centre National de la Recherche Scientifique

Institute of High Energy Physics

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Studies of B0 ---> rho+- pi-+ and evidence of B0 ----> rho0 pi0

Contributed to (2003)

Kazuo Abe Y. Chao S. Kobayashi D. Žontar D. Liventsev

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Search for lepton-flavor-violating $\tau^- \to \mu^-\mu^+\mu^-$ decays at Belle II

arXiv (Cornell University) (2024)

Belle II Collaboration I. Adachi L. Aggarwal H. Aihara N. Akopov

We present the result of a search for the charged-lepton-flavor violating decay $\tau^- \to \mu^-\mu^+\mu^-$ using a $424fb^{-1}$ sample of data recorded by the Belle II experiment at the SuperKEKB $e^{-}e^{+}$ collider. The selection of $e^{-}e^{+}\to\tau^+\tau^-$ events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a $90\%$ confidence level upper limit of $1.9 \times 10^{-8}$ on the branching fraction of the \taumu decay, which is the most stringent bound to date.

10.48550/arxiv.2405.07386

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An improved search for the electric dipole moment of the $\tau$ lepton

arXiv (Cornell University) (2021)

K. Inami K. Hayasaka I. Adachi H. Aihara S. Al Said

We report a measurement of the electric dipole moment of the $\tau$ lepton ($d_\tau$) using an 833 fb$^{-1}$ data sample collected near the $\Upsilon(4S)$ 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 $d_\tau$ as ${\rm Re}(d_\tau) = ( -0.62 \pm 0.63 ) \times 10^{-17} ~e{\rm cm}$ and ${\rm Im}(d_\tau) = ( -0.40 \pm 0.32 ) \times 10^{-17} ~e{\rm cm}$, respectively. These results are consistent with no electric dipole moment at the present level of experimental sensitivity and improve the sensitivity by about a factor of three.

KEKB

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