Photon Transitions in ψ(2S) Decays to χ_{cJ}(1P) and η_c(1S)

Details Photon Transitions in ψ(2S) Decays to χ_{cJ}(1P) and η_c(1S) Photon Transitions in ψ(2S) Decays to χ_{cJ}(1P) and η_c(1S)

2004-08-26

arxiv.org/abs/hep-ex/0408133v1

Phys.Rev.D70:112002,2004

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2004/, submitted to PRL

Scientific paper

10.1103/PhysRevD.70.112002

We have studied the inclusive photon spectrum in psi(2S) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates for psi(2S)--> gamma chicJ(1P) (J=0,1,2). We also confirm the hindered magnetic dipole (M1) transition, psi(2S)-->gamma etac(1S). However, the direct M1 transition psi(2S)-->gamma etac(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 MeV is not found in our data.

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