First evidence of ψ(2S)→Ω-Ω+

M. Ablikim et al (BESⅡ collaboration)

doi:10.1088/1674-1137/36/11/002

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(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.

References

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Farrar G R, Jackson R D. Phys. Rev. Lett., 1975,35: 1416; Ioffe B L. Phys. Lett. B, 1976, 63: 425; Vainshtein A I, Zakharov V I. Phys. Lett. B, 1978, 72: 368; Brodsky S J, Lepage G P. Phys. Rev. D, 1981, 24: 2848[2] Bolz J. Kroll P. Eur. Phys. J. C, 1998, 2: 545-556[3] BAI J Z et al. (BES collaboration). Phys. Rev. D, 2001, 63: 032002[4] Pedlar T K et al. (CLEO collaboration). Phys. Rev. D, 2005, 72: 051108[5] BAI J Z et al. (BES collaboration). Nucl. Instrum. Methods A, 2001, 458: 627[6] Ablikim M et al. (BES collaboration). Nucl. Instrum. Methods A, 2005, 552: 344[7] Beringer J et al. (Particle Data Group). Phys. Rev. D, 2012, 86: 010001 (web edition: accessed on July 09, 2012)[8] Ablikim M et al. (BES collaboration). Phys. Rev. D, 2004, 70: 092002[9] Bityukov S I, Krasnikov N V. Nucl. Instrum. Methods A, 2003, 502: 795-798[10] Ablikim M et al. (BES collaboration). Phys. Lett. B, 2007, 648: 149-155

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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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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 14×10⁶ 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.