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- W2247676857 abstract "We present measurements of the charmonium state $h_c(^1P_1)$ made with 106M $psi'$ events collected by BESIII at BEPCII. Clear signals are observed for $psi'topi^0 h_c$ with and without the subsequent radiative decay $h_ctogammaeta_c$. First measurements of the absolute branching ratios $mathcal{B}(psi' topi^0 h_c) = (8.4 pm 1.3 pm 1.0) times 10^{-4}$ and $mathcal{B}(h_c to gamma eta_c) = (54.3 pm 6.7 pm5.2)%$ are presented. A statistics-limited determination of the previously unmeasured $h_c$ width leads to an upper limit $Gamma(h_c)<1.44 $MeV (90% confidence). Measurements of $M(h_c) = 3525.40 pm 0.13 pm 0.18 $MeV/$c^2$ and $mathcal{B}(psi'to pi^0 h_c) times mathcal{B}(h_c to gammaeta_c) = (4.58 pm 0.40 pm 0.50) times 10^{-4}$ are consistent with previous results." @default.
- W2247676857 created "2016-06-24" @default.
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