Charmonium spectrometry from inclusive photons in J/PSI and PSI' decays

The Crystal Ball detector at SPEAR is used to study the inclusive photon spectra in decays of the J/PSI and PSI', with double our previous data sample. Branching fractions for PSI' → γchisub(0,1,2) have been measured as (9.7 +- 0.6)%, (8.8 +- 0.5)% and (7.7 +- 0.5)% respectively. Combining measurements from inclusive and exclusive Crystal Ball studies our best values for the natural widths are, GAMMAsub(tot)(chisub(0,1,2)) = (16 +- 4), <2.6 (90% C.L.), and (3 +- 2) MeV respectively; and the radiative widths GAMMA(chisub(0,1,2) → γJ/PSI) are (97 +- 38), <700 (90% C.L.), and (490 +-330) keV respectively. By assuming naive E1 theory for chisub(0,1) → γJ/PSI, we obtain an estimate for GAMMAsub(tot)(chi1) = (0.75 +- 0.50) MeV. Performing a simultaneous fit to the decays PSI' → γetasub(c) and J/PSI → γetasub(c) we measure the branching fractions as (0.29 +- 0.08)% and (1.20 + 0.53,-0.35)% respectively, for a mass of 2984 +- 5 MeV and a natural line width of 12.4 +-4.6 MeV. An eta'sub(c) candidate state is observed with mass M = 3592 +- 5 MeV, natural line width GAMMAsub(tot) < 8 MeV (95% C.L.), and BR(PSI' → γeta'sub(c) candidate) = (0.2-1.3)% (95% C.L.)