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Phys. Rev. D 70, 112002 (2004) [6 pages]

Photon transitions in ψ(2S) decays to χcJ(1P) and ηc(1S)

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S. B. Athar et al. CLEOCollaboration
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Received 26 August 2004; published 16 December 2004

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(2S)→γχcJ(1P) (J=0,1,2). We also confirm the hindered magnetic dipole (M1) transition, ψ(2S)→γηc(1S). However, the direct M1 transition ψ(2S)→γηc(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 MeV is not found in our data.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.70.112002
DOI:
10.1103/PhysRevD.70.112002
PACS:
14.40.Gx, 13.20.Gd