Observation of a Fourth Upsilon State in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Annihilations
D. Andrews(Cornell University), K. Berkelman(Cornell University), R. Cabenda(Cornell University), D. G. Cassel(Cornell University), J. W. DeWire(Cornell University), R. Ehrlich(Cornell University), T. Ferguson(Cornell University), T. Gentile(Cornell University), M. G. D. Gilchriese(Cornell University), B. Gittelman(Cornell University), D. L. Hartill(Cornell University), D. Herrup(Cornell University), M. Herzlinger(Cornell University), D. L. Kreinick(Cornell University), N. B. Mistry(Cornell University), E. Nordberg(Cornell University), R. Perchonok(Cornell University), R. Plunkett(Cornell University), K. A. Shinsky(Cornell University), R. Siemann(Cornell University), A. Silverman(Cornell University), P. C. Stein(Cornell University), S. Stone(Cornell University), R. Talman(Cornell University), H. G. Thonemann(Cornell University), D. Weber(Cornell University), C. Bebek(Cornell University), J. S. Haggerty(Cornell University), J. M. Izen(Harvard University Press), W. A. Loomis(Harvard University Press), F. M. Pipkin(Cornell University), J. Rohlf(Cornell University), W. Tanenbaum(Harvard University Press), Richard Wilson(Cornell University), A. J. Sadoff(Ithaca College), D. Bridges(Syracuse University), K. Chadwick(Cornell University), P. Ganci(University of Rochester), H. Kagan(University of Rochester), R. Kass(Cornell University), F. Lobkowicz(Cornell University), A. C. Melissinos(Cornell University), S. L. Olsen(University of Rochester), R. Poling(Cornell University), C. Rosenfeld(University of Rochester), G. Rucinski(University of Rochester), E. H. Thorndike(Cornell University), G. Warren(Cornell University), D. Bechis(Rutgers, The State University of New Jersey), J. J. Mueller(Rutgers, The State University of New Jersey), D. Potter(Cornell University), F. Sannes(Rutgers, The State University of New Jersey), P. Skubic(Rutgers, The State University of New Jersey), R. Stone(Cornell University), A. Brody(Cornell University), A. Chen(Syracuse University), M. Goldberg(Syracuse University), N. Horwitz(Cornell University), J. Kandaswamy(Cornell University), Hanne M. Kooy(Cornell University), P. Lariccia(Cornell University), G. C. Moneti(Syracuse University), M. S. Alam(Cornell University), S. E. Csorna(Vanderbilt University), R. S. Panvini(Cornell University), J. S. Poucher(Vanderbilt University)
Cited by 123
Abstract
A fourth state in the upsilon energy region has been seen in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at the Cornell Electron Storage Ring. A resonance is observed with a mass 1112\ifmmode\pm\else\textpm\fi{}5 MeV above the lowest upsilon state. The 9.6-MeV rms width is greater than the 4.6-MeV energy resolution of the ${e}^{+}{e}^{\ensuremath{-}}$ beams. The observed characteristics of the new state make it a likely candidate for the $4^{3}S$ state of the $b\overline{b}$ system, lying above the threshold for the production of $B$ mesons.
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