Observation of a fourth upsilon state in e+e- annihilations

D. Andrews, K. Berkelman, R. Cabenda, D. G. Cassel, J. W. DeWire, R. Ehrlich, T. Ferguson, T. Gentile, M. G.D. Gilchriese, B. Gittelman, D. L. Hartill, D. Herrup, M. Herzlinger, D. L. Kreinick, N. B. Mistry, E. Nordberg, R. Perchonok, R. Plunkett, K. A. Shinsky, R. H. SiemannA. Silverman, P. C. Stein, S. Stone, R. Talman, H. G. Thonemann, D. Weber, C. Bebek, J. Haggerty, J. M. Izen, W. A. Loomis, F. M. Pipkin, J. Rohlf, W. Tanenbaum, Richard Wilson, A. J. Sadoff, D. L. Bridges, K. Chadwick, P. Ganci, H. Kagan, R. Kass, F. Lobkowicz, A. Melissinos, S. L. Olsen, R. Poling, C. Rosenfeld, G. Rucinski, E. H. Thorndike, G. Warren, D. Bechis, J. J. Mueller

Research output: Contribution to journalArticlepeer-review

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A fourth state in the upsilon energy region has been seen in e+e- collisions at the Cornell Electron Storage Ring. A resonance is observed with a mass 1112+5 MeV above the lowest upsilon state. The 9.6-MeV rms width is greater than the 4.6-MeV energy resolution of the e+e- beams. The observed characteristics of the new state make it a likely candidate for the 4S3 state of the bb» system, lying above the threshold for the production of B mesons.

Original languageEnglish (US)
Pages (from-to)219-221
Number of pages3
JournalPhysical review letters
Issue number4
StatePublished - 1980

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