We have studied the inclusive photon spectrum in ψ(2S) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates for ψ(25) → γχ eJ(1P) (J = 0, 1, 2). We also confirm the hindered magnetic dipole (M1) transition, ψ(2S) → γη c(1S). However, the direct M1 transition ψ(2S) → γη c(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 McV is not found in our data.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Dec 2004|
Bibliographical noteFunding Information:
We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. This work was supported by the National Science Foundation and the U.S. Department of Energy.