Observation of a pseudoscalar state in J/ψ→γφφ near φφ threshold
Year: 1990
Type: article
Abstract: We present a study of the radiative decay J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\varphi}\ensuremath{\varphi} in the \ensuremath{\gamma}${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$ and \ensuremath{\gamma}${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathit{K}}_{\mathit{S}}^{0}$${\mathit{K}}_{\mathit{L}}^{0}$ final states. A pseudoscalar state is observed in the \ensuremath{\varphi}\ensuremath{\varphi} invariant-mass spectrum at 2.22 GeV/${\mathit{c}}^{2}$ with a width of 150 MeV/${\mathit{c}}^{2}$. The product branching ratios are B(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}X)B(X\ensuremath{\rightarrow}\ensuremath{\varphi}\ensuremath{\varphi})=(3.3\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ for the \ensuremath{\gamma}${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$ mode and B(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}X)B(X\ensuremath{\rightarrow}\ensuremath{\varphi}\ensuremath{\varphi})=(2.7\ifmmode\pm\else\textpm\fi{}0.6 \ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ for the \ensuremath{\gamma}${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathit{K}}_{\mathit{S}}^{0}$${\mathit{K}}_{\mathit{L}}^{0}$ mode. No evidence for ${2}^{++}$ states below 2.4 GeV/${\mathit{c}}^{2}$ is found in this radiative J/\ensuremath{\psi} decay mode.
Source: Physical Review Letters
Authors: Z. Bai, G. Blaylock, T. Bolton, T. Browder, J. Brown, K. Bunnell, T. Burnett, R. Cassell, D. Coffman, V. Cook, F. DeJongh, D. Dorfan, J. Drinkard, G. Dubois, G. Eigen, K. Einsweiler, B. Eisenstein, T. Freese, C. Gatto, G. Gladding, J. Hauser, C. Heusch, D. Hitlin, J. Izen, P. Kim, J. Labs, A. Li, W. Lockman, U. Mallik, C. Matthews, A. Mincer, R. Mir, P. Mockett, R. Mozley, B. Nemati, A. Odian, L. Parrish, R. Partridge, D. Pitman, S. Plaetzer, J. Richman, H. Sadrozinski, M. Scarlatella, T. Schalk, R. Schindler, A. Seiden, C. Simopoulos, I. Stockdale, W. Toki, B. Tripsas, F. Villa, M. Wang, S. Wasserbaech, A. Weinstein, S. Weseler, H. Willutzki, D. Wisinski, W. Wisniewski, R. Xu, Y. Zhu
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W35678797