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

Abstract

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.

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

References in corpus (6)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Observation of Double cc bar Production in e+ e- Annihilation at sqrt{s} ~ 10.6 GeV
• Observation of the eta_c(2S) in exclusive B-->K KsK-pi+ decays
• Observation of eta_c^{prime} Production in gamma gamma Fusion at CLEO
• Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate
• Heavy Quarkonium

Cited by in corpus (37)

• Heavy quarkonium: progress, puzzles, and opportunities
• Quarkonia and their transitions
• Observation of h_c(^1P_1) State of Charmonium
• J/psi and psi(2S) Radiative Transitions to eta_c
• Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements
• Observation of the ^1P_1 State of Charmonium
• Partial Wave Analysis of ${\chi }_{c0}\to {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$
• Photon transitions in Upsilon(2S) and Upsilon(3S)
• Observation of psi(3770) --> gamma chi_c0
• Branching Fractions for Transitions of psi(2S) to J/psi
• Branching Fractions for psi(2S) to J/psi Transitions
• The ratio of decay widths of X(3872) to ${\psi }^{\prime }\gamma$ and $J/\psi \gamma$ as a test of the X(3872) dynamical structure
• Observation of 1^-0^- Final States from psi(2S) Decays and e^+e^- Annihilation
• Observation of Thirteen New Exclusive Multi-Body Hadronic Decays of the $\psi (2S)$
• Two-Photon Widths of the chi_cJ States of Charmonium
• Exclusive heavy quarkonium + gamma production from e+ e- annihilation into a virtual photon
• Higher-order multipole amplitudes in charmonium radiative transitions
• New Measurement of Exclusive Decays of the chi_c0 and chi_c2 to Two-Meson Final States
• Precise measurement of spin-averaged chi_{cJ}(1P) mass using photon conversions in psi(2S) -> gamma chi_{cJ}
• chi_cJ Decays to h^+h^-h^0
• Search for psi(2S) -> gamma eta_c(2S) via fully reconstructed eta_c(2S) decays
• chi_{cJ} Decays to h^+h^-h^0
• Obervation of χ_{cJ}--> omega omega decays
• Exclusive Baryon-Antibaryon Decays of the chi_cJ Mesons
• Anomalous radiative transitions
• Two Photon Width of chi_{c2}
• Branching fractions for Y(3S) -> pi^0 h_b and psi(2S) -> pi^0 h_c
• chi_c0 and chi_c2 Decays into eta eta, eta eta', and eta' eta' Final States
• First Observation of Exclusive chi_cJ Decays to Two Charged and Two Neutral Hadrons
• Branching fraction measurements of $\psi (3686)\to \gamma {\chi }_{cJ}$
• Measurement of chi_cJ Decays to 2(pi^+pi^-)ppbar Final States
• Measurement of the branching fraction for $\psi (3770)\to \gamma {\chi }_{c0}$
• Branching fractions for chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega
• Shedding light on charmonium
• CLEO Spectroscopy Results
• Charm Dalitz analyzes from CLEO-c
• Charmonium Review