ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2014, vol. 738, p. 391-396
Measurement of J/ψ→γηc decay rate and ηc parameters at KEDR
© 2014 The Authors. Using the inclusive photon spectrum based on a data sample collected at the J/ψ peak with the KEDR detector at the VEPP-4M e+e- collider, we measured the rate of the radiative decay J/ψ→γηc as well as ηc mass and width. Taking into account an asymmetric photon lineshape we obtained Γγηc0=2.98±0.18-0.33+0.15keV, Mηc=2983.5±1.4-3.6+1.6MeV/c2, Γηc=27.2±3.1-2.6+5.4MeV.