Charmonium results from BES

PING Rong-Gang (for BES collaboration)

doi:10.1088/1674-1137/34/6/003

Chinese Physics C> 2010, Vol. 34> Issue(6) : 626-631 DOI: 10.1088/1674-1137/34/6/003

Charmonium results from BES

PING Rong-Gang (for BES collaboration)

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
Using ~14×10⁶ ψ(2S) and ~58×10⁶ J/ψ data collected at BESⅡ/BEPC, the branching fraction of ψ(2S)→Ω^－Ω⁺ is measured with about 5σ statistical significance. The Λ electric dipole and Λ decay parameter are studied using the decay J/ψ→ΛΛ→pp π⁺π^－. Using (106±3)×10⁶ ψ(2S) decays collected at BESⅢ/BEPCⅡ, we have obtained some interesting physics results. The branching fractions of χ_cj→π⁰π⁰, ηη are measured with precision improved. The mass and width of h_c(1¹P¹) state, together with the branching fractions of Br(ψ(2S)→π⁰h_c) and Br(h_c→γη_c) are the first measurements. Surprisingly, the decays of χ_c1→φφ, ωω, and ωφ are firstly observed in BESⅢ data.

References

[1]

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PING Rong-Gang (for BES collaboration). Charmonium results from BES[J]. Chinese Physics C, 2010, 34(6): 626-631. doi: 10.1088/1674-1137/34/6/003

PING Rong-Gang (for BES collaboration). Charmonium results from BES[J]. Chinese Physics C, 2010, 34(6): 626-631. doi: 10.1088/1674-1137/34/6/003 shu

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Received: 2010-01-25
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沈阳化工大学材料科学与工程学院沈阳 110142

Charmonium results from BES

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2010-01-25

Accepted Date: 1900-01-01

Available Online: 2010-06-05

Abstract:

Using ~14×10⁶ ψ(2S) and ~58×10⁶ J/ψ data collected at BESⅡ/BEPC, the branching fraction of ψ(2S)→Ω^－Ω⁺ is measured with about 5σ statistical significance. The Λ electric dipole and Λ decay parameter are studied using the decay J/ψ→ΛΛ→pp π⁺π^－. Using (106±3)×10⁶ ψ(2S) decays collected at BESⅢ/BEPCⅡ, we have obtained some interesting physics results. The branching fractions of χ_cj→π⁰π⁰, ηη are measured with precision improved. The mass and width of h_c(1¹P¹) state, together with the branching fractions of Br(ψ(2S)→π⁰h_c) and Br(h_c→γη_c) are the first measurements. Surprisingly, the decays of χ_c1→φφ, ωω, and ωφ are firstly observed in BESⅢ data.

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Charmonium results from BES

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