Measurement of B(J/psi->eta_c gamma) at KEDR

Details Measurement of B(J/psi->eta_c gamma) at KEDR Measurement of B(J/psi->eta_c gamma) at KEDR

2010-12-08

arxiv.org/abs/1012.1694v1

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 1 figure. To be published in the proceedings of the 4th International Workshop on Charm Physics (Charm2010), October

Scientific paper

We present a study of the inclusive photon spectrum from 6.3 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of the radiative decay J/psi -> eta_c gamma, eta_c width and mass. Taking into account an asymmetric photon line shape we obtain: M(eta_c) = (2978.1 +- 1.4 +- 2.0) MeV/c^2, Gamma(eta_c) = (43.5 +- 5.4 +- 15.8) MeV, B(J/psi->eta_c gamma) = (2.59 +- 0.16 +- 0.31)%$.

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