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

Measurement of J/ψ→ηcγ at KEDR

  • 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: M(ηc)=2979.4±1.5±1.9 MeV/c2, Γ(ηc) = 27.8±5.1±3.3 MeV, B(J/ψ→ηcγ)=(2.34±0.15±0.40)%.

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    [1] . Gaiser J et al. Phys. Rev. D, 1986, 34: 7112. Eichten E E et al. Rev. Mod. Phys., 2008, 80: 1161-11933. Beilin V A, Radyushkin A V. Sov. J. Nucl. Phys., 1987,45: 3424. Dudek J J et al. Phys. Rev. D, 2006, 73: 074505. Mitchell R E et al. Phys. Rev. Lett., 2009, 102: 0118016. Anashin V V et al. Nucl. Instr. and Meth. A, 2002, 478:4207. Anashin V et al. Stockholm 1998, EPAC 98*: 400. Preparedfor 6th European Particle Accelerator Conference (EPAC98), Stockholm, Sweden, 22-26 Jun 1998.8. Blinov V E et al. Nucl. Instr. and Meth. A, 2009, 598: 23

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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

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

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