Measurement of Ds± and Cabibbo-suppressed D± decays

The CERN charm photoproduction experiment NA14/2 has studied the K + K − π + , φπ + , φπ + π 0 , and φπ + π + π − decay modes of the D s + and D + charmed mesons, and the corresponding charge conjugate states. We measure branching ratios: Br ( D + →φπ + ) Br ( D + → K − π + π + ) =0.098±0.032±0.014, Br ( D s + → K ∗0 K + ) Br ( D s + →φπ + ) =0.85±0.34±0.20 , and obtain upper for the other channels. Contrary to the prediction of some theoretical models, we do noy observe any decay of D s into φρ. Using the Lund Monte Carlo to hadronize the final-state partons we derive a value for the absolute branching fraction Br(D s + → φπ + ) =4.8±1.9%.