Measurement of J/psi to eta_c gamma at KEDR
V.V. Anashin, V.M. Aulchenko, E.M. Baldin, A.K. Barladyan, A.Yu., Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.V. Bedny, O.L. Beloborodova, A.E., Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E., Bondar, A.R. Buzykaev, S.I. Eidelman, Yu.M. Glukhovchenko
TL;DR
This paper reports on the measurement of the properties of the eta_c meson via the radiative decay of J/psi using data from the KEDR detector, providing precise values for eta_c mass, width, and branching fraction.
Contribution
First measurement of eta_c properties from J/psi radiative decay at KEDR with improved precision.
Findings
eta_c mass measured as 2979.4 MeV
eta_c width measured as 27.8 MeV
Branching fraction of J/psi to eta_c gamma is 2.34%
Abstract
We present a study of the inclusive photon spectra from 5.9 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of radiative decay J/psi to eta_c gamma, eta_c width and mass. Our preliminary results are: M(eta_c) = 2979.4+-1.5+-1.9 MeV, G(eta_c) = 27.8+-5.1+-3.3 MeV, B(J/psi to eta_c gamma) = (2.34+-0.15+-0.40)%.
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