Measurement of J/ψ decays into ΛΛ π+π-

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M. Ablikim et al (BESⅡ collaboration). Measurement of J/ψ decays into ΛΛ π+π-[J]. Chinese Physics C, 2012, 36(11): 1031-1039. doi: 10.1088/1674-1137/36/11/001
M. Ablikim et al (BESⅡ collaboration). Measurement of J/ψ decays into ΛΛ π+π-[J]. Chinese Physics C, 2012, 36(11): 1031-1039.  doi: 10.1088/1674-1137/36/11/001 shu
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Received: 2012-07-16
Revised: 2012-08-16
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Measurement of J/ψ decays into ΛΛ π+π-

  • Institute of High Energy Physics, Beijing 100049, China

Abstract: Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→ΛΛ π+π- is observed for the first time. The branching fraction is measured to be Br(J/ψ→ΛΛ π+π-)=(4.30±0.13±0.99)×10-3, excluding the decays to intermediate states, namely J/ψ→Ξ-Ξ+, J/ψ→Σ(1385)-Σ(1385)+, and J/ψ→Σ(1385)+Σ(1385)-. The branching fractions for these intermediate resonance channels are measured to be:Br(J/ψ→Ξ-Ξ+)=(0.90±0.03±0.18)×10-3, Br(J/ψ→Σ(1385)-Σ(1385)+)=(1.23±0.07±0.30)×10-3,and Br(J/ψ→Σ(1385)+Σ(1385)-)=(1.50±0.08±0.38)×10-3, respectively. The angular distribution is of the form dN/d(cosθ)α(1+αcos2θ) with α=(0.35±0.29±0.06) for J/ψ→Ξ-Ξ+, α=(-0.54±0.22±0.10) for J/ψ→Σ(1385)-Σ(1385)+, and α=(-0.35±0.29±0.06) for J/ψ→Σ(1385)+Σ(1385)-.

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