| Popis: |
Prompt production of J/Ψ or Ψ(2S) in association with a second charmonium state has been observed by both the BABAR and Belle experiments in e⁺e⁻ annihilation around √s = 10.58 GeV. These processes provide an opportunity to study both perturbative and non-perturbative effects in QCD and to search for new charmonium states recoiling against the reconstructed J/Ψ or Ψ(2S). In this thesis I present a study of such events using the full BABAR dataset, where J/Ψ and Ψ(2S) are reconstructed via the decays J/Ψ → ℓ⁺ℓ⁻, Ψ(2S) → J/ΨΠ⁺Π⁻, and Ψ(2S) → ℓ⁺ℓ⁻. (ℓ⁺ℓ⁻ = e⁺e⁻, μ⁺μ⁻) |
