Measurement of R and search for new quark flavors decaying into multi-jet final states in e+e− collisions between 54.0 and 61.4 GeV CM energies
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Measurement of R and search for new quark flavors decaying into multi-jet final states in e+e− collisions between 54.0 and 61.4 GeV CM energies

K. Abe,K. Amako,Y. Arai,Y. Asano,M. Chiba,Y. 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,N. Kanematsu,J. Kanzaki,R. Kikuchi,T. Kondo,T. Koseki,H. Kurashige,T. Matsui,M. Minami,K. Miyake,S. Mori,Y. Nagashima,T. Nakamura,I. Nakano,Y. Narita,S. Odaka,K. Ogawa,T. Ohama,T. Ohsugi,A. Okamoto,A. Ono,H. Osabe,T. Oyama,H. Saito,H. Sakae,H. Sakamoto,M. Sakano,M. Sakuda,N. Sasao,M. Sato,M. Shioden,J. Shirai,S. Shirakata,S. Sugimoto,T. Sumiyoshi,A. Suzuki,Y. Suzuki,Y. Takada,F. Takasaki,A. Taketani,M. Takita,N. Tamura,R. Tanaka,N. Terunuma,K. Tobimatsu,T. Tsuboyama,A. Tsukamoto,S. Uehara,Y. Unno,M. Utsumi,M. Wakai,T. Watanabe,Y. Watase,F. Yabuki,Y. Yamada,T. Yamagata,T. Yamashita,Y. Yonezawa,H. Yoshida,S. Sakamoto,VENUS Collaboration;K. Abe;K. Amako;Y. Arai;Y. Asano;M. Chiba;Y. 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;N. Kanematsu;J. Kanzaki;R. Kikuchi;T. Kondo;T. Koseki;H. Kurashige;T. Matsui;M. Minami;K. Miyake;S. Mori;Y. Nagashima;T. Nakamura;I. Nakano;Y. Narita;S. Odaka;K. Ogawa;T. Ohama;T. Ohsugi;A. Okamoto;A. Ono;H. Osabe;T. Oyama;H. Saito;H. Sakae;H. Sakamoto;M. Sakano;M. Sakuda;N. Sasao;M. Sato;M. Shioden;J. Shirai;S. Shirakata;S. Sugimoto;T. Sumiyoshi;A. Suzuki;Y. Suzuki;Y. Takada;F. Takasaki;A. Taketani;M. Takita;N. Tamura;R. Tanaka;N. Terunuma;K. Tobimatsu;T. Tsuboyama;A. Tsukamoto;S. Uehara;Y. Unno;M. Utsumi;M. Wakai;T. Watanabe;Y. Watase;F. Yabuki;Y. Yamada;T. Yamagata;T. Yamashita;Y. Yonezawa;H. Yoshida;S. Sakamoto;VENUS Collaboration;
physics letters b 1990 Vol. 234 pp. 382-388
179
collaboration1990physicsmeasurement

Abstract

We accumulated e+e− annihilations into multi-hadrons at CM energies between 54.0 and 61.4 GeV with the VENUS detector at TRISTAN. Measured R-ratios are consistent with the standard model using the Z-boson mass; 91.1 GeV/c2. Using two new observables, we searched for a planar four-jet and other multi-jet events resulting from the decay of a charge — 13eb' quark. Having observed no positive signals, we excluded b' masses between 19.4 and 28.2 GeV/c2 with a 95% confidence level, regardless of branching into charged current and loop-induced flavor-changing neutral current decay, including a possible Higgs decay process. The charge +23e top quark was excluded below f30.2 GeV/c2.

Keywords

top quark standard model confidence level

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DOI:
10.1016/0370-2693(90)91946-9
URL:
https://sciprofiles.com/publication/view/765099e15...

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ID: 268868
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