Improved measurements of the absolute branching fractions of the inclusive decays $D^{+(0)}\to\phi X$

Abstract

By analyzing 2.93 fb−1 of e+e− annihilation data taken at the center-of-mass energy s= 3.773 GeV with the BESIII detector, we determine the branching fractions of the inclusive decays D+→ϕX and D0→ϕX to be (1.135 ± 0.034 ± 0.031)% and (1.091 ± 0.027 ± 0.035)% , respectively, where X denotes any possible particle combination. The first uncertainties are statistical, and the second are systematic. We also determine the branching fractions of the decays D→ϕX and their charge conjugate modes D¯→ϕX¯ separately for the first time, and no significant CP asymmetry is observed.