Search for the decay Ds→ρ0π as evidnce for quark annnihilation

Abstract We have searched for the decay D + s → ρ 0 π + which can only occur via annihilation of the constituent quarks, and compared it to the decay D + s → ρπ + where the charm quark may decay independently of the light quark. An upper limit on the ratio BR ( D + s →ρ 0 π + ) BR ( D + s →ρπ + ) of 0.22 at the 90% confidence level is obtained. This result constra ins models which enhance. the weak annihilation contribution to heavy meson decays by final-state interactions, a mechanism used for explaining the large branching ratio observed for D 0 →ρ K 0 .