Bkg. studyfor→元元nLUND MC55MC--Lund_Charm50445J/→元°元+元一n'(m032元2510data01.61.418922m元元m40n' sidebands40dataEE20302001.522.5310m(元*元n）(GeV/c3)O1416182222426280m(元*元m）(GeV/c3)
Bkg. study for 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → 𝜋 +𝜋 −𝜂) LUND MC 𝐽/𝜓 → 𝜋 0𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → 𝜋 +𝜋 −𝜂) sidebands data data
→-元Bkg. StudyforEfficiency curvePhase space eventsMC4000w2002002141.61.8222242628141.61.82.22.4262.833m(元*元m)(GeV/c2)EfficiencyCurve
Bkg. Study for 𝐽/𝜓 → 𝛾𝜋 +𝜋 −𝜂 ′ (𝜂 ′ → 𝜋 +𝜋 −𝜂) Efficiency curve Phase space events MC