MEASUREMENT OF R AND SEARCH FOR THE TOP QUARK IN E+E- ANNIHILATION BETWEEN 39.8 AND 45.2 GEV

MEASUREMENT OF R AND SEARCH FOR THE TOP QUARK IN E+E- ANNIHILATION BETWEEN 39.8 AND 45.2 GEV

e+e- annihilation into hadrons was studied at CM energies between 39.8 and 45.2 GeV and a search was made for new heavy quarks. No evidence was found for the existence of a narrow state excluding the possible existence of the lowest vector toponium state in this mass range. A search for continuum pr...

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书目详细资料
Main Authors: Althoff, M, Braunschweig, W, Kirschfink, F, Lubelsmeyer, K, Martyn, H, Peise, G, Rimkus, J, Rosskamp, P, Sander, H, Schmitz, D, Siebke, H, Wallraff, W, Fischer, H, Hartmann, H, Hillen, W, Jocksch, A, Knop, G, Kopke, L, Kolanoski, H, Kuck, H, Mertens, V, Wedemeyer, R, Wollstadt, M, Eisenberg, Y, Gather, K
格式: Journal article
语言:English
出版: 1984
实物特征
总结:e+e- annihilation into hadrons was studied at CM energies between 39.8 and 45.2 GeV and a search was made for new heavy quarks. No evidence was found for the existence of a narrow state excluding the possible existence of the lowest vector toponium state in this mass range. A search for continuum production of heavy quarks led to lower mass limits for new quarks of 22.0 GeV (eQ = 2 3) and 21.0 GeV (eQ = 1 3). Quarks are found to be pointlike, the corresponding mass parameter being larger than 288 GeV. A fit of the QCD and the electroweak contributions to R=σtot/σμμ yielded sin2θW = 0.30-0.07+0.23. © 1984.

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