Download or read book Pseudoscalar Semileptonic Decays of the D0 Meson written by and published by . This book was released on 2004 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The FOCUS experiment is designed to investigate charm particle decays. These charm particles are produced by the interaction of a photon beam with an average energy of 175 GeV on a BeO target and travel an average of few millimeters before decaying in the spectrometer. By reconstructing the daughters from the decay, we can infer properties of the charm particles. Semileptonic decays have been used to measure many CKM matrix elements. These decays are interesting due to the simplicity of their theoretical description but they are experimentally challenging due to the fact that a neutrino is not detected. Analysis of semileptonic decays in the charm sector are of great interest because they provide an excellent environment to test and to calibrate theoretical calculation that can be implemented in the determination of poorly known matrix elements such as Vub. In this thesis we report an analysis of the decays D0 → ?-?+v and D0 → K- ?+v. We measure the relative branching ratio as well as the ratio of the form factors f$?top{+}$0)/f$Ktop{+}$(0). Using a weighting technique, we further report a parametric analysis of the q2 dependence for both the decay modes measuring the pole masses. For the decay D0 → K-?+v, we report on the form factor ratio f$Ktop{-}$(0)/f$Ktop{+}$(0). Finally, they report a non-parametric study of the q2 dependence of the form factor for the decay D0 → K- ?+v.