Measurements of six-body hadronic decays of the D0 charmed meson

Abstract Using data collected by the FOCUS experiment at Fermilab, we report the discovery of the decay modes D 0 → K − π + π + π + π − π − and D 0 → π + π + π + π − π − π − . With a sample of 48±10 reconstructed D 0 → K − π + π + π + π − π − decays and 149±17 reconstructed D 0 → π + π + π + π − π − π − decays, we measure the following relative branching ratios: Γ(D 0 →K − π + π + π + π − π − )/Γ(D 0 →K − π + π + π − )=(2.70±0.58±0.38)×10 −3 , Γ(D 0 →π + π + π + π − π − π − )/Γ(D 0 →K − π + π + π − )=(5.23±0.59±1.35)×10 −3 , Γ(D 0 →π + π + π + π − π − π − )/Γ(D 0 →K − π + π + π + π − π − )=1.93±0.47±0.48. The first errors are statistical and the second are systematic. The branching fraction of the Cabibbo suppressed six-body decay mode is measured to be a factor of two higher than the branching fraction of the Cabibbo favored six-body decay mode.