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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-

  •  Institute of High Energy Physics, Beijing 100049, China

  • 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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    [1] 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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Measurement of J/ψ decays into ΛΛ π+π-

  • 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)-.

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