Heavy quark spectroscopy results from CLEO-c

We present a collection of results from the analysis of the approximately 25 million ψ(2S) decays collected with the CLEO-c detector at the Cornell Electron Storage Ring. We report the most precise measurements of the magnetic dipole transitions to the ground state of the charmonium system: B(ψ(2S)→γηc)=(4.32±0.16±0.60)×10−3 and B(J/ψ→γηc)=(1.98±0.09±0.30)%. In addition we study purely electromagnetic decays of the χc0,2 and J/ψ states, with the first observation of a 3γ decay of meson: B(J/ψ→3γ)=(1.2±0.3±0.2)×10−5. Finally we present a precision measurement of the hc mass M(hc)=3525.28±0.19±0.12 MeV/c2 and, therefore, the hyperfine splitting in P-wave charmonium ΔMhf(1P)=+0.02±0.19±0.13 MeV/c2.