Studyof hc(1P1) at BESIII

Inclusive measurements of the spin-singlet P-wave state of charmonium hc(1P1) have been performed with a sample of approximately 106 million ψ(2S) decays collected with the BESIII detector at the BEPCII electron-positron storage ring. We fitted distributions of the mass recoiling against the π0 in the decay ψ(2S)π0hc both inclusively and with a tag of the E1-transition photon from hc→γηc to obtain the following preliminary results:M(hc) = 3525.16±0.16(stat.) MeV, Γ(hc) = 0.89±0.57(stat.) MeV, B(ψ(2S)→π0hc) = (8.42±1.29(stat.))x10-4, B(ψ(2S)→π0hc)xB(hc→γηc) = (4.69±0.48(stat.)x10-4, and B(hc→γηc) = (55.7±6.3(stat.))%.