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Search for New Charged Leptons Decaying into Massive Neutrinos and New Stable Charged Leptons in e + e − Collisions

1988; American Physical Society; Volume: 61; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.61.915

1092-0145

K. Abe, B. R. Ko, Y. Arai, Y. Asano, M. Chiba, Yasuo Chiba, M. Daigo, T. Emura, I. Endo, M. Fukawa, T. Fukui, Y. Fukushima, J. Haba, D. Haidt, I. Hayashibara, Y. Hemmi, M. Higuchi, T. Hirose, Y. Hojyo, Y. Homma, Y. Hoshi, Y. Ikegami, N. Ishihara, T. Kamitani, Nobuyuki Kanematsu, J. Kanzaki, R. Kikuchi, T. Kondo, T. Koseki, K. Kubo, H. Kurashige, Takayuki Matsui, M. Minami, K. Miyake, Shigeki Mori, Y. Nagashima, T. Nakamura, I. Nakano, S. Odaka, K. Ogawa, T. Ohama, T. Ohsugi, A. Ono, H. Osabe, Hitoshi Saitô, H. Sakae, H. Sakamoto, S. Sakamoto, M. Sakano, M. Sakuda, N. Sasao, M. Sato, M. Shioden, J. Shirai, F. Suekane, S. Sugimoto, T. Sumiyoshi, Y. Suzuki, Yoshihisa Takada, F. Takasaki, A. Taketani, N. Tamura, R. Tanaka, K. Tobimatsu, T. Tsuboyama, Akira Tsukamoto, S. Uehara, Y. Unno, M. Wakai, Takashi Watanabe, Y. Watase, Y. Yamada, T. Yamagata, T. Yamashita, Hajime Yoshida,

Neutrino Physics Research

A search for sequential charged leptons decaying into massive neutrinos has been performed at ${E}_{\mathrm{c}.\mathrm{m}.}=56$ GeV at the KEK colliding-beam accelerator TRISTAN. We have found no evidence for the production of the charged heavy leptons for an integrated luminosity of 5.3 ${\mathrm{pb}}^{\ensuremath{-}1}$. A search for stable charged leptons was also conducted yielding null results. A new mass limit on the charged heavy leptons was obtained as a function of the mass of the associated neutrinos.