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χ_{ c0 }和χ_{ c2 }对π^0π^0和ηη的支化分数测量

Branching fraction measurements of χ_{c0} and χ_{c2} to π^0π^0 and ηη

The BESIII Collaboration

备注：
17 pages, 6 figures, submitted to Phys. Rev. D
发表信息：
Phys.Rev.D81:052005,2010
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摘要：

Using a sample of 1.06 \times 10^8 ψ^{ \prime } decays collected by the BESIII detector, χ_{c0} and χ_{c2} decays into π^0π^0 and ηηare studied. The branching fraction results are Br(χ_{c0} \to π^0π^0)=(3.23 \pm 0.03 \pm 0.23 \pm 0.14) \times 10^{-3}, Br(χ_{c2} \to π^0π^0)=(8.8 \pm 0.2 \pm 0.6 \pm 0.4) \times 10^{-4}, Br(χ_{c0} \to ηη)=(3.44 \pm 0.10 \pm 0.24 \pm 0.2) \times 10^{-3}, and Br(χ_{c2} \to ηη)=(6.5 \pm 0.4 \pm 0.5 \pm 0.3) \times 10^{-4}, where the uncertainties are statistical, systematic due to this measurement, and systematic due to the branching fractions of ψ^{ \prime } \to γχ_{cJ}, respectively. The results provide information on the decay mechanism of χ_c states into pseudoscalars.

英文摘要：

Using a sample of 1.06 \times 10^8 ψ^{\prime} decays collected by the BESIII detector, χ_{c0} and χ_{c2} decays into π^0π^0 and ηηare studied. The branching fraction results are Br(χ_{c0}\toπ^0π^0)=(3.23\pm 0.03\pm0.23 \pm 0.14)\times 10^{-3}, Br(χ_{c2}\toπ^0π^0)=(8.8\pm 0.2\pm 0.6\pm0.4)\times 10^{-4}, Br(χ_{c0}\toηη)=(3.44\pm 0.10\pm0.24 \pm0.2)\times 10^{-3}, and Br(χ_{c2}\toηη)=(6.5\pm 0.4\pm 0.5\pm 0.3)\times 10^{-4}, where the uncertainties are statistical, systematic due to this measurement, and systematic due to the branching fractions of ψ^{\prime}\toγχ_{cJ}, respectively. The results provide information on the decay mechanism of χ_c states into pseudoscalars.

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