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Measurements of hc(1P1)h_c(^1P_1) in ψ′\psi' Decays

Collaboration
Feb, 2010
6 pages
Published in:
  • Phys.Rev.Lett. 104 (2010) 132002
e-Print:
DOI:
Experiments:
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Abstract: (arXiv)
We present measurements of the charmonium state hc(1P1)h_c(^1P_1) made with 106M ψ′\psi' events collected by BESIII at BEPCII. Clear signals are observed for ψ′→π0hc\psi'\to\pi^0 h_c with and without the subsequent radiative decay hc→γηch_c\to\gamma\eta_c. First measurements of the absolute branching ratios B(ψ′→π0hc)=(8.4±1.3±1.0)×10−4\mathcal{B}(\psi' \to\pi^0 h_c) = (8.4 \pm 1.3 \pm 1.0) \times 10^{-4} and B(hc→γηc)=(54.3±6.7±5.2)\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 hch_c width leads to an upper limit \Gamma(h_c)<1.44 MeV (90% confidence). Measurements of M(hc)=3525.40±0.13±0.18M(h_c) = 3525.40 \pm 0.13 \pm 0.18 MeV/c2c^2 and B(ψ′→π0hc)×B(hc→γηc)=(4.58±0.40±0.50)×10−4\mathcal{B}(\psi'\to \pi^0 h_c) \times \mathcal{B}(h_c \to \gamma\eta_c) = (4.58 \pm 0.40 \pm 0.50) \times 10^{-4} are consistent with previous results.
Note:
  • 5 pages, 1 figure, accepted for publication in Physical Review Letters
  • 12.38.Qk
  • 14.40.Pq
  • 13.25.Gv
  • electron positron: annihilation
  • psi(3685): hadronic decay
  • h/c(3526): radiative decay
  • h/c(3526): width
  • charmonium: branching ratio
  • BES
  • experimental results