Measurement of J/ψ decays into ΛΛ π<SUP>+</SUP>π<SUP>-</SUP>

M. Ablikim et al (BESⅡ collaboration)

doi:10.1088/1674-1137/36/11/001

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Chinese Physics C> 2012, Vol. 36> Issue(11) : 1031-1039 DOI: 10.1088/1674-1137/36/11/001

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

M. Ablikim et al (BESⅡ collaboration)

Institute of High Energy Physics, Beijing 100049, China

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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)^-.

References

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Eaton M W et al. Phys. Rev. D, 1984, 29: 804[2] Henrard P et al. Nucl. Phys. B, 1987, 292: 670-692[3] Abilkim M et al. (BES collaboration). Phys. Lett. B, 2006, 632: 181-186[4] Herber H E, Perrier J. Phys. Rev. D, 1985, 32: 2961[5] BAI J Z et al. (BES collaboration). Phys. Lett. B, 2004, 591: 42[6] Ablikim M et al. (BES collaboration). Phys. Lett. B, 2007, 648: 149[7] CHEN Hong, PING R G. Phys. Lett. B, 2007, 644: 54-58[8] Carimalo C. Int. J. Mod. Phys. A, 1987, 2: 249[9] BAI J Z et al. (BES collaboration). Nucl. Instrum. Methods A, 1994, 344: 319[10] BAI J Z et al. (BES collaboration). Nucl. Instrum. Methods A, 2001, 458: 627[11] Ablikim M et al. (BES collaboration). Nucl. Instrum. Methods A, 2005, 552: 344[12] YAO W M et al. (Particle Data Group). Journal of Physics G, 2012, 33: 1 (on the web)[13] FANG S S et al. High Energy Phys. and Nucl. Phys., 2003, 27: 277 (in Chinese)

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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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1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

M. Ablikim et al (BESⅡ collaboration)

Institute of High Energy Physics, Beijing 100049, China

Received Date: 2012-07-16
Accepted Date: 2012-08-16
Available Online: 2012-11-05

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)^-.