Measurement of R and search for new heavy quarks in e+e- annihilation at 50 and 52 GeV centre-of-mass energies

H. Yoshida, Y. Chiba, I. Endo, I. Hayashibara, T. Ohsugi, A. Taketani, R. Tanaka, K. Amako, Y. Arai, H. Boerner, M. Fukawa, Y. Fukushima, N. Ishihara, J. Kanzaki, T. Kondo, K. Maehata, T. Matsui, S. Odaka, K. Ogawa, T. OhamaH. Sakamoto, Makoto Sakuda, J. Shirai, T. Sumiyoshi, F. Suekane, Y. Teramoto, F. Takasaki, T. Tsuboyama, S. Uehara, Y. Unno, M. Wake, Y. Watase, Y. Yamada, Y. Noguchi, A. Ono, Y. Homma, Y. Hojyo, H. Sakae, Y. Hemmi, R. Kikuchi, K. Kubo, H. Kurashige, K. Miyake, T. Nakamura, Noboru Sasao, N. Tamura, K. Tobimatsu, J. Haba, T. Kamitani, N. Kanematsu, Y. Nagashima, H. Osabe, S. Sakamoto, S. Sugimoto, Y. Suzuki, A. Tsukamoto, T. Yamashita, K. Abe, M. Higuchi, Y. Hoshi, M. Sato, T. Emura, M. Chiba, T. Fukui, T. Hirose, Y. Nakagawa, M. Minami, H. Saito, M. Wakai, T. Watanabe, T. Yamagata, Y. Asano, T. Koseki, S. Mori, M. Sakano, M. Shioden, Y. Takada, Y. Ikegami, I. Nakano, M. Daigo

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Abstract

The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3e.

Original languageEnglish
Pages (from-to)570-576
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume198
Issue number4
DOIs
Publication statusPublished - Dec 3 1987
Externally publishedYes

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hadrons
center of mass
quarks
energy
cross sections

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Measurement of R and search for new heavy quarks in e+e- annihilation at 50 and 52 GeV centre-of-mass energies. / Yoshida, H.; Chiba, Y.; Endo, I.; Hayashibara, I.; Ohsugi, T.; Taketani, A.; Tanaka, R.; Amako, K.; Arai, Y.; Boerner, H.; Fukawa, M.; Fukushima, Y.; Ishihara, N.; Kanzaki, J.; Kondo, T.; Maehata, K.; Matsui, T.; Odaka, S.; Ogawa, K.; Ohama, T.; Sakamoto, H.; Sakuda, Makoto; Shirai, J.; Sumiyoshi, T.; Suekane, F.; Teramoto, Y.; Takasaki, F.; Tsuboyama, T.; Uehara, S.; Unno, Y.; Wake, M.; Watase, Y.; Yamada, Y.; Noguchi, Y.; Ono, A.; Homma, Y.; Hojyo, Y.; Sakae, H.; Hemmi, Y.; Kikuchi, R.; Kubo, K.; Kurashige, H.; Miyake, K.; Nakamura, T.; Sasao, Noboru; Tamura, N.; Tobimatsu, K.; Haba, J.; Kamitani, T.; Kanematsu, N.; Nagashima, Y.; Osabe, H.; Sakamoto, S.; Sugimoto, S.; Suzuki, Y.; Tsukamoto, A.; Yamashita, T.; Abe, K.; Higuchi, M.; Hoshi, Y.; Sato, M.; Emura, T.; Chiba, M.; Fukui, T.; Hirose, T.; Nakagawa, Y.; Minami, M.; Saito, H.; Wakai, M.; Watanabe, T.; Yamagata, T.; Asano, Y.; Koseki, T.; Mori, S.; Sakano, M.; Shioden, M.; Takada, Y.; Ikegami, Y.; Nakano, I.; Daigo, M.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 198, No. 4, 03.12.1987, p. 570-576.

Research output: Contribution to journalArticle

Yoshida, H, Chiba, Y, Endo, I, Hayashibara, I, Ohsugi, T, Taketani, A, Tanaka, R, Amako, K, Arai, Y, Boerner, H, Fukawa, M, Fukushima, Y, Ishihara, N, Kanzaki, J, Kondo, T, Maehata, K, Matsui, T, Odaka, S, Ogawa, K, Ohama, T, Sakamoto, H, Sakuda, M, Shirai, J, Sumiyoshi, T, Suekane, F, Teramoto, Y, Takasaki, F, Tsuboyama, T, Uehara, S, Unno, Y, Wake, M, Watase, Y, Yamada, Y, Noguchi, Y, Ono, A, Homma, Y, Hojyo, Y, Sakae, H, Hemmi, Y, Kikuchi, R, Kubo, K, Kurashige, H, Miyake, K, Nakamura, T, Sasao, N, Tamura, N, Tobimatsu, K, Haba, J, Kamitani, T, Kanematsu, N, Nagashima, Y, Osabe, H, Sakamoto, S, Sugimoto, S, Suzuki, Y, Tsukamoto, A, Yamashita, T, Abe, K, Higuchi, M, Hoshi, Y, Sato, M, Emura, T, Chiba, M, Fukui, T, Hirose, T, Nakagawa, Y, Minami, M, Saito, H, Wakai, M, Watanabe, T, Yamagata, T, Asano, Y, Koseki, T, Mori, S, Sakano, M, Shioden, M, Takada, Y, Ikegami, Y, Nakano, I & Daigo, M 1987, 'Measurement of R and search for new heavy quarks in e+e- annihilation at 50 and 52 GeV centre-of-mass energies', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 198, no. 4, pp. 570-576. https://doi.org/10.1016/0370-2693(87)90920-8
Yoshida, H. ; Chiba, Y. ; Endo, I. ; Hayashibara, I. ; Ohsugi, T. ; Taketani, A. ; Tanaka, R. ; Amako, K. ; Arai, Y. ; Boerner, H. ; Fukawa, M. ; Fukushima, Y. ; Ishihara, N. ; Kanzaki, J. ; Kondo, T. ; Maehata, K. ; Matsui, T. ; Odaka, S. ; Ogawa, K. ; Ohama, T. ; Sakamoto, H. ; Sakuda, Makoto ; Shirai, J. ; Sumiyoshi, T. ; Suekane, F. ; Teramoto, Y. ; Takasaki, F. ; Tsuboyama, T. ; Uehara, S. ; Unno, Y. ; Wake, M. ; Watase, Y. ; Yamada, Y. ; Noguchi, Y. ; Ono, A. ; Homma, Y. ; Hojyo, Y. ; Sakae, H. ; Hemmi, Y. ; Kikuchi, R. ; Kubo, K. ; Kurashige, H. ; Miyake, K. ; Nakamura, T. ; Sasao, Noboru ; Tamura, N. ; Tobimatsu, K. ; Haba, J. ; Kamitani, T. ; Kanematsu, N. ; Nagashima, Y. ; Osabe, H. ; Sakamoto, S. ; Sugimoto, S. ; Suzuki, Y. ; Tsukamoto, A. ; Yamashita, T. ; Abe, K. ; Higuchi, M. ; Hoshi, Y. ; Sato, M. ; Emura, T. ; Chiba, M. ; Fukui, T. ; Hirose, T. ; Nakagawa, Y. ; Minami, M. ; Saito, H. ; Wakai, M. ; Watanabe, T. ; Yamagata, T. ; Asano, Y. ; Koseki, T. ; Mori, S. ; Sakano, M. ; Shioden, M. ; Takada, Y. ; Ikegami, Y. ; Nakano, I. ; Daigo, M. / Measurement of R and search for new heavy quarks in e+e- annihilation at 50 and 52 GeV centre-of-mass energies. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 1987 ; Vol. 198, No. 4. pp. 570-576.
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abstract = "The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10{\%}. From the event shape analysis we found no evidence for a new quark with charge 2 3e.",
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TY - JOUR

T1 - Measurement of R and search for new heavy quarks in e+e- annihilation at 50 and 52 GeV centre-of-mass energies

AU - Yoshida, H.

AU - Chiba, Y.

AU - Endo, I.

AU - Hayashibara, I.

AU - Ohsugi, T.

AU - Taketani, A.

AU - Tanaka, R.

AU - Amako, K.

AU - Arai, Y.

AU - Boerner, H.

AU - Fukawa, M.

AU - Fukushima, Y.

AU - Ishihara, N.

AU - Kanzaki, J.

AU - Kondo, T.

AU - Maehata, K.

AU - Matsui, T.

AU - Odaka, S.

AU - Ogawa, K.

AU - Ohama, T.

AU - Sakamoto, H.

AU - Sakuda, Makoto

AU - Shirai, J.

AU - Sumiyoshi, T.

AU - Suekane, F.

AU - Teramoto, Y.

AU - Takasaki, F.

AU - Tsuboyama, T.

AU - Uehara, S.

AU - Unno, Y.

AU - Wake, M.

AU - Watase, Y.

AU - Yamada, Y.

AU - Noguchi, Y.

AU - Ono, A.

AU - Homma, Y.

AU - Hojyo, Y.

AU - Sakae, H.

AU - Hemmi, Y.

AU - Kikuchi, R.

AU - Kubo, K.

AU - Kurashige, H.

AU - Miyake, K.

AU - Nakamura, T.

AU - Sasao, Noboru

AU - Tamura, N.

AU - Tobimatsu, K.

AU - Haba, J.

AU - Kamitani, T.

AU - Kanematsu, N.

AU - Nagashima, Y.

AU - Osabe, H.

AU - Sakamoto, S.

AU - Sugimoto, S.

AU - Suzuki, Y.

AU - Tsukamoto, A.

AU - Yamashita, T.

AU - Abe, K.

AU - Higuchi, M.

AU - Hoshi, Y.

AU - Sato, M.

AU - Emura, T.

AU - Chiba, M.

AU - Fukui, T.

AU - Hirose, T.

AU - Nakagawa, Y.

AU - Minami, M.

AU - Saito, H.

AU - Wakai, M.

AU - Watanabe, T.

AU - Yamagata, T.

AU - Asano, Y.

AU - Koseki, T.

AU - Mori, S.

AU - Sakano, M.

AU - Shioden, M.

AU - Takada, Y.

AU - Ikegami, Y.

AU - Nakano, I.

AU - Daigo, M.

PY - 1987/12/3

Y1 - 1987/12/3

N2 - The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3e.

AB - The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3e.

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U2 - 10.1016/0370-2693(87)90920-8

DO - 10.1016/0370-2693(87)90920-8

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AN - SCOPUS:3042559132

VL - 198

SP - 570

EP - 576

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

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

SN - 0370-2693

IS - 4

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