摘要: Results of studies of selected radiative decays of the psi' to charmonium and non-charmonium states which decay into photons are presented. These studies were performed using a sample of 1.8 x 10 exp 6 produced psi''s collected by... 展开 Results of studies of selected radiative decays of the psi' to charmonium and non-charmonium states which decay into photons are presented. These studies were performed using a sample of 1.8 x 10 exp 6 produced psi''s collected by the Crystal Ball detector at the SPEAR electron-positron storage ring. The branching ratios of the chi sub 0 , chi sub 2 , and eta'/sub c/ to two photons have been measured to be (4.5 +- 2.2 +- 2.0) x 10 exp -4 , (9.5 +- 2.9 +- 4.5) x 10 exp -4 (first errors statistical, second systematic), and <1 x 10 exp -2 (90% C.L.). The signal from the decay chain psi' implies gamma chi sub 0 , chi sub 0 implies pi exp 0 pi exp 0 has been observed with essentially no background. Using the observed line shape of the radiative photon in this reaction, the full width of the psi sub 0 has been found to be 8.8 +- 1.3 +- 1.5 MeV/c exp 2 . In addition, the branching ratios of the chi sub 0 and chi sub 2 to pi exp 0 pi exp 0 have been measured to be (3.5 +- 0.3 +- 1.2) x 10 exp -3 and (1.2 +- 0.2 +- 0.4) x 10 exp -3 ; the branching ratios of the chi sub 0 and chi sub 2 to eta eta have been measured to be (2.8 +- 0.9 +- 1.3) x 10 exp -3 and (8.4 +- 4.2 +- 4.0) x 10 exp -4 . The decays of the psi' to four non-charmonium states have been investigated. The branching ratios and upper limits of these decays have been normalized to the branching ratios of the corresponding decays from the J/psi which have been measured using a sample of 2.2 x 10 exp 6 produced J/psi's collected by the Crystal Ball detector. The ratios of the psi' branching ratios to the J/psi branching ratios for the final states gamma eta, gamma eta', gamma theta, and gamma f have been measured to be <1.8%, <2.6%, <10 to 15%, and 9 +- 3%. These results are compared with the theoretical expectations of lowest-order quantum chromodynamics potential models. Substantial disagreement is found between theory and experiment. (ERA citation 10:040502) 收起