Chinese Physics C > 2002, Vol. 26 > Issue(1): 8-16

Branching Ratios of J/ψ→π⁰3(π⁺π^－)

BES Collaboration^,

Institute of High Energy Physics, CAS, Beijing 100039, China

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The decay mode of J/ψ→π ⁰3(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 0.2×10 ⁶J/ψ events of MARKⅠ. Now, BESⅠ has a data sample of 7.8×10 ⁶J/ψ events, we can make more accurate results than MARKⅠ. Total of 3290±43 J/ψ→π ⁰3(π ⁺π ^－) events including 1275±86 J/ψ→ω ²(π ⁺π ^－) events are selected. J/ψ→π ⁰3(π ⁺π ^－) and J/ψ→ω ²(π ⁺π ^－) events have been generated with MC simulition for calculating events selection efficiency. BESⅠ result is: Br(J/ψ→π ⁰3(π ⁺π ^－))=(2.52±0.06±0.43)% and Br(J/ψ→π ⁰3(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.

References

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BES Collaboration. Branching Ratios of J/ψ→π ⁰3(π ⁺π ^－)[J]. Chinese Physics C, 2002, 26(1): 8-16.

BES Collaboration. Branching Ratios of J/ψ→π ⁰3(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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通讯作者:陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Branching Ratios of J/ψ→π⁰3(π⁺π^－)

Corresponding author:BES Collaboration,

Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date:2001-05-28

Accepted Date:1900-01-01

Available Online:2002-01-05

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⁺π^－) events are selected. J/ψ→π⁰3(π⁺π^－) and J/ψ→ω²(π⁺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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