Year: 1984
Type: article
Abstract: In a study of 2.7 million $\frac{J}{\ensuremath{\psi}}$ decays with the Mark III, a new magnetic detector at SPEAR, we have observed the sequential decay $\frac{J}{\ensuremath{\psi}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}$, ${\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}\ensuremath{\varphi}\ensuremath{\varphi}$. The product branching fraction is (1.02\ifmmode\pm\else\textpm\fi{}0.25\ifmmode\pm\else\textpm\fi{}0.14)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$, 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 ${\ensuremath{\eta}}_{c}$ are ${0}^{\ensuremath{-}}$.
Source: Physical Review Letters
Authors: 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. Haber, R. 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
Institutions: California Institute of Technology, University of Utah
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W129535679