Branching Ratios of J/ψ→π03(π+π)

  • The decay mode of J/ψ→π03(π+π) was studied very little before. There are no informations except branching ratios for this channel in PDG book which based on less than 0.2×106J/ψ events of MARKⅠ. Now, BESⅠ has a data sample of 7.8×106J/ψ events, we can make more accurate results than MARKⅠ. Total of 3290±43 J/ψ→π03(π+π) events including 1275±86 J/ψ→ω2+π) events are selected. J/ψ→π03(π+π) and J/ψ→ω2+π) events have been generated with MC simulition for calculating events selection efficiency. BESⅠ result is: Br(J/ψ→π03(π+π))=(2.52±0.06±0.43)% and Br(J/ψ→π03(π+π))=(1.31±0.09±0.21)%. Meanwhile, we studied the invariant mass of 4π and ωππ to find interesting signals. It seems that there is a peak at about 1.74GeV in the invarianat mass spectrum of 4π, and a enhancement was also found at about 1.9GeV in the invariant mass spectrum of ωππ. It is not clear whether they are from resonances or background. Therefore, more work in detail is still going on.
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  • [1] Vannucci F et al . Phys. Rev., 1977, D15: 1814; Franklin M E B et a1 . Phys . Rev. Lett., 1983, 51: 963 ; Jean-Marie B et al. Phys. Rev. Lett., 1976, 36:2912 BAI J Z et al. Nucl. Instr. Meth. 1994, A344:319-3143 BAI J Z et a1 (BES Collab.) . High Energy Phys. and Nucl. Phys., 1995, 19: 1254 Barnes T et al. Nucl. Phys., 1983, B224: 2415 Lacock P et al. Phys. Rev., 1996, D54: 6997; Berbard C et al . Nucl . Phys. (Proc . Suppl. ., 1997, B53: 2286 Isgur N, Paton J. Phys. Rev., 1985, D31:29107 Barnes T et al . Phys. Rev., 1995, D52: 52428 Claude Bernard et a1 . Phys . Rev., 1997, D56: 70399 Alde D et al. Phys. Lett., 1988, BN5: 39710 Beladidze G M et al. Phys. Lett., 1993, B313: 27611 Aoyagi H et al . Phys . Lett., 1993, B314: 24612 Lee J H et al. Phys. Lett., 1994, B323:22713 Thompson D R et al (E852 Collab.) . Phys. Rev. Lett., 1997, 79: 163014 Adams G S et a1 (E852 Collab.) . Phys . Rev. Lett., 1998, 81: 576015 Abele A et al (Crystal Barrel Collab.) . Phys. Lett., 1998, B423: 175
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BES Collaboration. Branching Ratios of J/ψ→π03(π+π)[J]. Chinese Physics C, 2002, 26(1): 8-16.
BES Collaboration. Branching Ratios of J/ψ→π03(π+π)[J]. Chinese Physics C, 2002, 26(1): 8-16. shu
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Received: 2001-05-28
Revised: 1900-01-01
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Branching Ratios of J/ψ→π03(π+π)

    Corresponding author: BES Collaboration,
  • Institute of High Energy Physics, CAS, Beijing 100039, China

Abstract: The decay mode of J/ψ→π03(π+π) was studied very little before. There are no informations except branching ratios for this channel in PDG book which based on less than 0.2×106J/ψ events of MARKⅠ. Now, BESⅠ has a data sample of 7.8×106J/ψ events, we can make more accurate results than MARKⅠ. Total of 3290±43 J/ψ→π03(π+π) events including 1275±86 J/ψ→ω2+π) events are selected. J/ψ→π03(π+π) and J/ψ→ω2+π) events have been generated with MC simulition for calculating events selection efficiency. BESⅠ result is: Br(J/ψ→π03(π+π))=(2.52±0.06±0.43)% and Br(J/ψ→π03(π+π))=(1.31±0.09±0.21)%. Meanwhile, we studied the invariant mass of 4π and ωππ to find interesting signals. It seems that there is a peak at about 1.74GeV in the invarianat mass spectrum of 4π, and a enhancement was also found at about 1.9GeV in the invariant mass spectrum of ωππ. It is not clear whether they are from resonances or background. Therefore, more work in detail is still going on.

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