Search for neutrinoless decays τ→3ℓ

Yusa, Y.; Nagamine, T.; Yamaguchi, A.; Abe, K.; Abe, T.; Adachi, I.; Aihara, H.; Akatsu, M.; Asano, Y.; Aulchenko, V.; Aushev, T.; Bahinipati, S.; Bakich, A.M.; Banas, E.; Bedny, I.; Bitenc, U.; Bizjak, I.; Bondar, A.; Bozek, A.; Bračko, M.; Browder, T.E.; Chang, M.-C.; Cheon, B.G.; Chistov, R.; Choi, Y.; Chuvikov, A.; Danilov, M.; Dong, L.Y.; Eidelman, S.; Eiges, V.; Enari, Y.; Fratina, S.; Gabyshev, N.; Garmash, A.; Gershon, T.; Gokhroo, G.; Golob, B.; Haba, J.; Hayashii, H.; Hazumi, M.; Hinz, L.; Hokuue, T.; Hoshi, Y.; Hou, W.-S.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, H.; Iwasaki, M.; Kang, J.H.; Kang, J.S.; Kapusta, P.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, H.O.; Koppenburg, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kuzmin, A.; Kwon, Y.-J.; Lee, S.H.; Lesiak, T.; Li, J.; Lin, S.-W.; MacNaughton, J.; Matsumoto, T.; Matyja, A.; Mikami, Y.; Mitaroff, W.; Miyata, H.; Mohapatra, D.; Moloney, G.R.; Mori, T.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Okabe, T.; Okuno, S.; Olsen, S.L.; Ostrowicz, W.; Ozaki, H.; Pakhlov, P.; Palka, H.; Park, H.; Park, K.S.; Parslow, N.; Perroud, J.-P.

doi:10.1016/j.physletb.2004.04.002

research article

Search for neutrinoless decays τ→3ℓ

Yusa, Y.

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Nagamine, T.

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Yamaguchi, A.

2004

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

We have searched for neutrinoless τ lepton decays into three charged leptons using an 87.1fb-1 data sample collected with the Belle detector at the KEKB e+e- collider. Since the number of signal candidate events is compatible with that expected from the background, we set 90% confidence level upper limits on the branching fractions in the range (1.9-3.5)×10-7 for various decay modes τ -→ℓ-ℓ+ℓ- where ℓ represents e or μ. © 2004 Published by Elsevier B.V.