## Study of B $$\rightarrow$$ $$D_{s}^{(*)+}X$$ and $$B^{0}$$ $$\rightarrow$$ $$D_{s}^{(*)+}D^{*-}$$ decays with the BABAR detector

• Precise measurements of $$D_{s}^{+}$$ and $$D_{s}^{*+}$$ meson production from B mesons and qqbar continuum events near the Upsilon(4S) resonance are presented in this document. Using the BABAR data recorded in 1999 and 2000 of 20.8 fb-1 on-resonance and 2.6 fb-1 off-resonance, the inclusive branching fractions of $$D_{s}^{(*)+}$$ mesons from B decays have been measured. The branching fractions (BR(B $$\rightarrow$$ $$D_{s}^{(*)}$$ + $$D^{(*)})$$) and (BR(B $$\rightarrow$$ $$D_{s}^{*}$$ + $$D^{(*)}$$)) have been determined from the fit of the measured $$D_{s}^{(*)+}$$ momentum spectra. The study of different fragmentation functions and production cross sections measurement were done for the $$D_{s}^{(*)+}$$ momentum spectrum produced from qqbar continuum events. Employing a partial reconstruction technique, the branching fractions of the $$B^{0}$$$$\rightarrow$$$$D_{s}^{(*)}$$+$$D^{*-}$$ decays have been determined. From the angular analysis of $$B^{0}$$$$\rightarrow$$$$D_{s}^{*}$$+$$D^{*-}$$ mode the fraction of longitudinal polarization is determined.