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Abstract:
Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the branching ratio for the Cabibbo-favored decay mode D0→K−K+π−π+D^0 \to K^-K^+\pi^-\pi^+. From a sample of 2669±1012669 \pm 101 fully reconstructed D0→K−K+π−π+D^0 \to K^-K^+\pi^-\pi^+ events, we measure Γ(D0→K−K+π−π+)/Γ(D0→K−π−π+π+)=0.0295±0.0011(stat.)±0.0008(syst.)\Gamma(D^0 \to K^-K^+\pi^-\pi^+)/\Gamma(D^0 \to K^-\pi^-\pi^+\pi^+) = 0.0295 \pm 0.0011(stat.) \pm 0.0008(syst.). A coherent amplitude analysis has been performed to determine the resonant substructure of this decay mode. This analysis reveals a dominant contribution from D0→K1+K−D^0 \to K_1^+ K- modes.
  • photon nucleus: inclusive reaction
  • beryllium: oxygen
  • D0: photoproduction
  • D0: hadronic decay
  • K: pair production
  • pi: pair production
  • decay: amplitude analysis
  • K1(1270)
  • K1(1400)
  • rho(770)0