We report an observation of the process J/ψ → γX(1835) → γK0SK0Sη at low K0SK0S mass with a statistical significance larger than 12.9σ using a data sample of 1.31 × 109 J/ψ events collected with the BESIII detector. In this region of phase space the K0SK0S system is dominantly produced through the f0(980). By performing a partial wave analysis, we determine the spin parity of the X(1835) to be JPC = 0−+. The mass and width of the observed X(1835) are 1844 ± 9(stat)+16−25 (syst) MeV/c2 and 192+20−17 (stat)+62−43 (syst) MeV, respectively, which are consistent with the results obtained by BESIII in the channel J/ψ → γπ+π−η'.

Observation and spin-parity determination of the X(1835) in J/ψ → γK0SK0Sη

Pacetti S.;
2015

Abstract

We report an observation of the process J/ψ → γX(1835) → γK0SK0Sη at low K0SK0S mass with a statistical significance larger than 12.9σ using a data sample of 1.31 × 109 J/ψ events collected with the BESIII detector. In this region of phase space the K0SK0S system is dominantly produced through the f0(980). By performing a partial wave analysis, we determine the spin parity of the X(1835) to be JPC = 0−+. The mass and width of the observed X(1835) are 1844 ± 9(stat)+16−25 (syst) MeV/c2 and 192+20−17 (stat)+62−43 (syst) MeV, respectively, which are consistent with the results obtained by BESIII in the channel J/ψ → γπ+π−η'.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11391/1462693
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