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ABSTRACT: The first measurement of B(D0→φX0) and an upper limit for B(D+→φX+) are determined from 22.3 pb-1 of e+e- annihilation data at a c.m. energy of 4.03 GeV. The data were recorded by the Beijing Spectrometer (BES) at BEPC. A recoil charge method is applied to charm threshold data to determine the charge of the D meson in the recoil from 9054±309±416 reconstructed D0, D+ mesons. The branching fractions B(D0→φX0)=(1.71-0.71+0.76±0.17)%, and B(D+→φX+)<1.8% are determined from 10 events with a reconstructed D and a recoiling φ. In addition, a 90% C.L. upper limit of B(D+→φe+X0)<1.6% is determined from a search for semileptonic decays of the D+.
Phys. Rev. D. 07/2000; 62(5).