Chinese Physics C > 2010, Vol. 34 > Issue(6): 831-835 DOI: 10.1088/1674-1137/34/6/035

Measurement of J/ψ→η_cγ at KEDR

et al

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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→η_cγ, η_cwidth and mass. Our preliminary results are:M(η_c)=2979.4±1.5±1.9 MeV/c²,Γ(η_c) = 27.8±5.1±3.3 MeV, B(J/ψ→η_cγ)=(2.34±0.15±0.40)%.

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et al. Measurement of J/ψ→η _cγ 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→η _cγ 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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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of J/ψ→η_cγ at KEDR

et al

Received Date:2010-01-26
Accepted Date:1900-01-01
Available Online:2010-06-05

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→η_cγ, η_cwidth and mass. Our preliminary results are:M(η_c)=2979.4±1.5±1.9 MeV/c²,Γ(η_c) = 27.8±5.1±3.3 MeV, B(J/ψ→η_cγ)=(2.34±0.15±0.40)%.