Observation of the decay ηc+Φ and determination of the ηc spin and parity

R. M. Baltrusaitis, J. J. Becker, G. T. Blaylock, J. S. Brown, K. O. Bunnell, T. H. Burnett, R. E. Cassell, D. Coffman, V. Cook, D. H. Coward, H. Cui, C. Del Papa, D. E. Dorfan, A. L. Duncan, K. F. Einsweiler, B. I. Eisenstein, R. Fabrizio, G. Gladding, F. Grancagnolo, B. HaberR. P. Hamilton, J. Hauser, C. A. Heusch, D. G. Hitlin, D. Hutchinson, P. M. Mockett, L. Moss, R. F. Mozley, A. Nappi, A. Odian, J. Perrier, S. A. Plaetzer, J. D. Richman, J. R. Roehrig, J. J. Russell, H. F.W. Sadrozinski, M. Scarlatella, T. L. Schalk, R. H. Schindler, A. Seiden, J. C. Sleeman, D. B. Smith, A. L. Spadafora, J. J. Thaler, W. Toki, Y. Unno, F. Villa, A. Wattenberg, N. Wermes, H. J. Willutzki, D. E. Wisinski, W. J. Wisniewski

Research output: Contribution to journalArticlepeer-review


In a study of 2.7 million J decays with the Mark III, a new magnetic detector at SPEAR, we have observed the sequential decay Jc, c. The product branching fraction is (1.02±0.25±0.14)×10-4, where the quoted errors are statistical and systematic, respectively. Analysis of the final-state angular distributions provides the first experimental determination that the spin and parity of the c are 0-.

Original languageEnglish (US)
Pages (from-to)2126-2129
Number of pages4
JournalPhysical review letters
Issue number24
StatePublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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