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Measurement of the branching fraction of the semileptonic decay B̄⁰ [forward arrow] D*⁺ [mu] v̄̄ [mu] in the BABAR experiment Thiessen, Douglas Michael

Abstract

This thesis presents a measurement of the branching fraction for the exclusive semileptonic decay B° —> D*+yTV^. 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 BB pairs collected by the BABAR detector at the Stanford Linear Accelerator Center in 1999-2000. The branching fraction is measured to be B(B° —> = [4.72 ±0.10 (data stat.) ±0.06 (MC stat.)±0.20 (syst.) ±0.17 (other B)] %.

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