Chinese Physics C > 2012, Vol. 36 > Issue(11): 1040-1045 DOI: 10.1088/1674-1137/36/11/002

First evidence of ψ(2S)→Ω^-Ω⁺

M. Ablikim et al (BESⅡ collaboration)

Institute of High Energy Physics, Beijing 100049, China

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Abstract：
The decay ψ(2 S)→Ω ^- Ω ⁺is analyzed using 14×10 ⁶ ψ(2 S) events recorded by the Beijing Spectrometer Ⅱ (BESⅡ) at the Beijing Electron Positron Collider (BEPC). Based upon events with no missing charged tracks and a satisfactory four-constraint kinematic t, we determine the upper limit for the branching fraction of ψ(2 S)→Ω ^- Ω ⁺to be 1.5×10 ⁴at a 90% confidence level. By including events with one missing charged track, we are able to report the first evidence of an Ω ⁺signal with a statistical signi cance of 3.1| σ. The branching fraction of ψ(2 S) Ω ⁺is determined to be (4.80±1.56(stat)±1.30(sys))10 ⁵.

References

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M. Ablikim et al (BESⅡ collaboration). First evidence of ψ(2 S)→Ω ^-Ω ⁺[J]. Chinese Physics C, 2012, 36(11): 1040-1045. doi: 10.1088/1674-1137/36/11/002

M. Ablikim et al (BESⅡ collaboration). First evidence of ψ(2 S)→Ω ^-Ω ⁺[J]. Chinese Physics C, 2012, 36(11): 1040-1045. doi:10.1088/1674-1137/36/11/002 shu

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Received: 2012-07-11
Revised: 2012-08-14

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沈阳化工大学材料科学与工程学院沈阳 110142

First evidence of ψ(2S)→Ω^-Ω⁺

M. Ablikim et al (BESⅡ collaboration)

Institute of High Energy Physics, Beijing 100049, China

Received Date:2012-07-11
Accepted Date:2012-08-14
Available Online:2012-11-05

Abstract:The decay ψ(2S)→Ω^-Ω⁺is analyzed using 14×10⁶ψ(2S) events recorded by the Beijing Spectrometer Ⅱ (BESⅡ) at the Beijing Electron Positron Collider (BEPC). Based upon events with no missing charged tracks and a satisfactory four-constraint kinematic t, we determine the upper limit for the branching fraction of ψ(2S)→Ω^-Ω⁺to be 1.5×10⁴at a 90% confidence level. By including events with one missing charged track, we are able to report the first evidence of anΩ⁺signal with a statistical signi cance of 3.1|σ. The branching fraction of ψ(2S)Ω⁺is determined to be (4.80±1.56(stat)±1.30(sys))10⁵.