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 0π +) 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 .