First evidence of ψ(2S)→Ω-Ω+

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M. Ablikim et al (BESⅡ collaboration). First evidence of ψ(2S)→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(2S)→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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First evidence of ψ(2S)→Ω-Ω+

  • Institute of High Energy Physics, Beijing 100049, China

Abstract: The decay ψ(2S)→Ω-Ω+ is analyzed using 14×106 ψ(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 1.5×104 at 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(2S)Ω+ is determined to be (4.80±1.56(stat)±1.30(sys))105.

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