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. Ohama; H. Sakamoto; M. 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; N. 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

doi:10.1016/0370-2693(87)90920-8

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, M. 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, N. 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)/σ_point(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 language	English (US)
Pages (from-to)	570-576
Number of pages	7
Journal	Physics Letters B
Volume	198
Issue number	4
DOIs	https://doi.org/10.1016/0370-2693(87)90920-8
State	Published - Dec 3 1987
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0370-2693(87)90920-8

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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., ... 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 B, 198(4), 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, 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 B, vol. 198, no. 4, pp. 570-576. https://doi.org/10.1016/0370-2693(87)90920-8

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

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.",

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

year = "1987",

month = dec,

day = "3",

doi = "10.1016/0370-2693(87)90920-8",

language = "English (US)",

volume = "198",

pages = "570--576",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "4",

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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, M.

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, N.

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.

UR - http://www.scopus.com/inward/record.url?scp=3042559132&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3042559132&partnerID=8YFLogxK

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

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

M3 - Article

AN - SCOPUS:3042559132

SN - 0370-2693

VL - 198

SP - 570

EP - 576

JO - Physics Letters B

JF - Physics Letters B

IS - 4

ER -

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

Abstract

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