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Search for isolated photons from flavor-changing neutral-current decay of a new quark at the KEK e + e − </mml…

1989; American Physical Society; Volume: 63; Issue: 17 Linguagem: Inglês

10.1103/physrevlett.63.1776

1092-0145

K. Abe, K. Amako, 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. Hojo, Y. Homma, Y. Hoshi, Y. Ikegami, N. Ishihara, T. Kamitani, Nobuyuki Kanematsu, J. Kanzaki, R. Kikuchi, T. Kondo, T. Koseki, H. Kurashige, Takayuki Matsui, M. Minami, K. Miyake, Shumpei Mori, Y. Nagashima, T. Nakamura, I. Nakano, Y. Narita, S. Odaka, K. Ogawa, T. Ohama, T. Ohsugi, A. Okamoto, A. Ono, H. Osabe, Takashi Oyama, Hitoshi Saitô, H. Sakae, H. Sakamoto, S. Sakamoto, M. Sakano, M. Sakuda, N. Sasao, M. Sato, M. Shioden, J. Shirai, S. Sugimoto, T. Sumiyoshi, Y. Suzuki, Yoshihisa Takada, F. Takasaki, A. Taketani, N. Tamura, R. Tanaka, N. Terunuma, K. Tobimatsu, T. Tsuboyama, Akira Tsukamoto, S. Uehara, Y. Unno, M. Utsumi, M. Wakai, T. Watanabe, Y. Watase, Y. Yamada, T. Yamagata, T. Yamashita, Yasushige Yonezawa, Hajime Yoshida,

Quantum Chromodynamics and Particle Interactions

A search for a new charge -(1/3 quark has been carried out at the KEK ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$Collider TRISTAN under the assumption of its photonic decay through a flavor-changing neutral current (FCNC). The observed number of multihadronic events with isolated photons is consistent with that expected from the known five quark flavors. Including the usual charged-current decays, limits on the absolute photonic branching ratio and FCNC processes were obtained.