Observation of a pp mass threshold enhancement in ψ′→π<SUP>+</SUP>π<SUP>－</SUP>J/ψ(J/ψ→γpp) decay

M. Ablikim (BESⅢ collaboration)

doi:10.1088/1674-1137/34/4/001

Chinese Physics C> 2010, Vol. 34> Issue(4) : 421-426 DOI: 10.1088/1674-1137/34/4/001

Observation of a pp mass threshold enhancement in ψ′→π⁺π^－J/ψ(J/ψ→γpp) decay

M. Ablikim (BESⅢ collaboration)

Institute of High Energy Physics, CAS, Beijing 100049, China

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Abstract：
The decay channel ψ′→π⁺π^－J/ψ(J/ψ→γpp) is studied using a sample of 1.06×10⁸ ψ′ events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the pp invariant mass spectrum. The enhancement can be fitted with an S-wave Breit-Wigner resonance function with a resulting peak mass of M=1861⁺⁶_－13 (stat)⁺⁷_－26 (syst) MeV/c² and a narrow width that is Γ<38 MeV/c² at the 90% confidence level. These results are consistent with published BESII results. These mass and width values do not match with well established mesons.

References

[1]

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M. Ablikim (BESⅢ collaboration). Observation of a pp mass threshold enhancement in ψ′→π⁺π^－J/ψ(J/ψ→γpp) decay[J]. Chinese Physics C, 2010, 34(4): 421-426. doi: 10.1088/1674-1137/34/4/001

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Received: 2010-01-29
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Observation of a pp mass threshold enhancement in ψ′→π⁺π^－J/ψ(J/ψ→γpp) decay

Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2010-01-29

Accepted Date: 1900-01-01

Available Online: 2010-04-05

Abstract:

The decay channel ψ′→π⁺π^－J/ψ(J/ψ→γpp) is studied using a sample of 1.06×10⁸ ψ′ events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the pp invariant mass spectrum. The enhancement can be fitted with an S-wave Breit-Wigner resonance function with a resulting peak mass of M=1861⁺⁶_－13 (stat)⁺⁷_－26 (syst) MeV/c² and a narrow width that is Γ<38 MeV/c² at the 90% confidence level. These results are consistent with published BESII results. These mass and width values do not match with well established mesons.

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Observation of a pp mass threshold enhancement in ψ′→π⁺π^－J/ψ(J/ψ→γpp) decay

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Observation of a pp mass threshold enhancement in ψ′→π+π－J/ψ(J/ψ→γpp) decay

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Observation of a pp mass threshold enhancement in ψ′→π⁺π^－J/ψ(J/ψ→γpp) decay

Observation of a pp mass threshold enhancement in ψ′→π⁺π^－J/ψ(J/ψ→γpp) decay