Charmed Hybrid: pp -> Ψ_g η

Convener

Analyst

Decay Modes

• production at 15 GeV beam momentum: pp→ψ_gη
• assume ψ_g mass m=4290MeV and width Γ=20MeV
• Channel 1: Ψ_g → χ_c1 (π⁰ π⁰)_s-wave
  • Χ_c1 → J/Ψ γ
  • J/Ψ → e⁺ e^- (50%), J/Ψ → μ⁺ μ^- (50%)
  • π⁰, η → γ γ
• Summary: pp → χ_c1 (π⁰ π⁰)_s-wave η

• Channel 2: Ψ_g -> D⁰ D^0*
  • D^0* → D⁰ π⁰
  • D⁰ → K^- π⁺ π⁰
  • π⁰, η → γ γ
• Summary: pp → D⁰ D^0*η

Background Channels

• Channel 1
  • pp → χ_c0 (π⁰ π⁰)_s-wave η
  • pp → χ_c1 (π⁰ π⁰ π⁰)_p-wave η
  • pp → χ_c1 (π⁰ η)_flat η
  • all χ_cJ decay radiatively
• Channel 2
  • pp → D⁰ D^0*η, same D-channels as signal channel
    • either 1 additional π⁰ in D⁰ decay
    • or 1 additional π⁰ in D⁰ decay of the D^0* decay
  • pp → D⁰ D^0*π⁰, same D-channels as signal channel
• each background channel with equal number of events as the signal channel

Documents

• MP14-070702_dubnaAnalysis.pdf: Dubna Collaboration Meeting, July 4

• mp_gsiSepAna.pdf: GSI Collaboration Meeting, September 19

• pad0001.pdf: Panda Note: Charmonium and Charmonium Hybrids (preliminary)