EventSelectionfor-元X4c<83000AOAINA[Myy- Mnl<0.05GeVn2000xc < 15>1000used to improve the500mdssrresolutionnr000.20.40.6(GeVIc3)M(YY)[M元+元^n - Mn=l <0.015GeV1
➢ ➢ ➢ used to improve the mass resolution ➢ Event Selection for 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → 𝜋 +𝜋 −𝜂) 𝜒4𝐶 2 < 8 |𝑀γγ − 𝑀𝜂| < 0.05GeV 𝜒5𝐶 2 < 15 𝑀𝜋 +𝜋 −𝜂 |𝑀𝜋 +𝜋 −𝜂 − 𝑀𝜂 ′ | < 0.015GeV 𝜂
J/-→元）Analysis ofnX(1835)4004030030200201001000321.41.61.82.22.42.62.80.91.1m(元*元n)(GeV/c3)m(元元m)(GeV/c3)
Analysis of 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → 𝜋 +𝜋 −𝜂) 𝜂′ X(1835)
/-+元pEvent Selection for<8X4cTOX2c < xR+K-n+n-W104Vnw10Myy > 0.22GeV[Myy -mnl > 0.05GeV100.72<Myy< 0.82GeV1000.250.50.75[M元+元n - Mn*l<0.025GeVM(m) (GeVic)
Event Selection for 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → γρ) 𝜒4𝐶 2 < 𝜒𝐾+𝐾−𝜋 +𝜋 −γγ 2 𝜒4𝐶 2 < 8 ➢ ➢ ➢ ➢ 𝑀γγ > 0.22GeV |𝑀γγ − 𝑚𝜂| > 0.05GeV 0.72 < 𝑀γγ < 0.82GeV |𝑀𝜋 +𝜋 −𝜂 − 𝑀𝜂 ′ | < 0.025GeV 𝜋 0 𝜂 𝜔
J/→元元（p）Analysis ofnX(1835)140100020(100750805006040250工200O0.911.30.81.11.222.2182426282141.6m(元*元)(GeV/c3)m(元*元m）(GeV/c2)
Analysis of 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → γρ) 𝜂′ X(1835)
Background Studymass-sidebandeventsMain backgroundJ/→元°元元60M defays by LUND modelCheck efficiency curvephase space
➢ mass-sideband events ➢ Main background, ➢ 60M decays by LUND model ➢ Check efficiency curve ➢ phase space Background Study 𝜂′ 𝐽/𝜓 → 𝜋 0𝜋 +𝜋 −𝜂 ′ 𝐽/𝜓 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′