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Search for New Particles in e + e − Annihilation from 39.79 to 45.52 GeV

1984; American Physical Society; Volume: 53; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.53.134

1092-0145

B. Adeva, D. P. Barber, U. Becker, J. Berdugo, Alexandria B. Boehm, J. G. Branson, J.D. Burger, M. Capell, M. Cerrada, H. S. Chen, M. Chen, M. L. Chen, M. Y. Chen, Y. S. Chu, E. Deffur, M. Demarteau, B. Z. Dong, P. Duinker, H. Fesefeldt, D.G. Fong, M. Fukushima, Ruixiong Han, D. Harting, T. Hebbeker, G. Herten, Mehdi Hussain, M.M. Ilyas, Chun-Hua Jiang, D. Z. Jiang, W. Krenz, P.G. Kuijer, D. Luckey, E. J. Luit, C. Mañá, M.A. Marquina, G.G.G. Massaro, R. Mount, K. Nadeem, H. B. Newman, M. Pohl, F. P. Poschmann, R. R. Rau, S. Consuegra Rodŕıguez, M. Rohde, J.A. Rubio, H. Rykaczewski, J. Salicio, I. Schulz, Howard A. Stone, G. M. Swider, Ping Tang, D. Teuchert, Samuel C.C. Ting, K.L. Tung, M. Q. Wang, M. J. White, Huifang Wu, S.X. Wu, B. Wysłouch, Bo Yang, C. C. Chang, B. Zhou, R. Y. Zhu, Y. C. Zhu,

High-Energy Particle Collisions Research

We have searched for resonances in the reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons}, \ensuremath{\gamma}\ensuremath{\gamma}, \ensuremath{\mu}\ensuremath{\mu}, \mathrm{and} \mathrm{ee}$, in the energy range $39.79<\sqrt{s}<45.52$ GeV, using the Mark J detector at PETRA. We obtain stringent upper limits on the production of toponium and particles postulated to explain ${Z}^{0}\ensuremath{\rightarrow}\mathrm{lepton}\mathrm{pair}+\ensuremath{\gamma}$ events observed at the CERN $\stackrel{-}{p}p$ collider. We also set limits on the mass and coupling constant of excited electrons.