Measurement of the Branching Fraction of the Semileptonic Decay Anti-B0 -> D(sup asterik) + Mu-Anti-Muon-Neutrino in the BaBar Experiment

摘要

This thesis presents a measurement of the branching fraction for the exclusive semileptonic decay (bar B)(sup 0) (yields) D*(sup +)(mu)(sup -)(nu)(sub (mu)). This decay is essentially the decay of a b quark to a c quark inside the meson with the release of a muon and neutrino, and it provides a very clean signal for measuring various B meson decay properties. the data for this measurement consist of 22.3 million B(bar B) pairs collected by the BABAR detector at the Stanford Linear Accelerator Center in 1999-2000. The branching fraction is measured to be (Beta)((bar B)(sup 0) (yields) D*(sup +)(mu)(sup -)(bar (nu))(sub (mu))) = (4.72 (+-) 0.10 (data stat.) (+-) 0.06 (MC stat.) (+-) 0.20 (syst.) (+-) 0.17 (other (Beta)))%.