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

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M. Ablikim (BESⅢ collaboration). Observation of a pp mass threshold enhancement in ψ′→π+πJ/ψ(J/ψ→γpp) decay[J]. Chinese Physics C, 2010, 34(4): 421-426. doi: 10.1088/1674-1137/34/4/001
M. Ablikim (BESⅢ collaboration). Observation of a pp mass threshold enhancement in ψ′→π+πJ/ψ(J/ψ→γpp) decay[J]. Chinese Physics C, 2010, 34(4): 421-426.  doi: 10.1088/1674-1137/34/4/001 shu
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Received: 2010-01-29
Revised: 1900-01-01
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Observation of a pp mass threshold enhancement in ψ′→π+πJ/ψ(J/ψ→γpp) decay

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

Abstract: 

The decay channel ψ′→π+πJ/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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