Measurement of J/ψ→ηcγ at KEDR

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et al. Measurement of J/ψ→ηcγ at KEDR[J]. Chinese Physics C, 2010, 34(6): 831-835. doi: 10.1088/1674-1137/34/6/035
et al. Measurement of J/ψ→ηcγ at KEDR[J]. Chinese Physics C, 2010, 34(6): 831-835.  doi: 10.1088/1674-1137/34/6/035 shu
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Received: 2010-01-26
Revised: 1900-01-01
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Measurement of J/ψ→ηcγ at KEDR

Abstract: 

We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e+e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are: Mc)=2979.4±1.5±1.9 MeV/c2, Γc) = 27.8±5.1±3.3 MeV, B(J/ψ→ηcγ)=(2.34±0.15±0.40)%.

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