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Search for B Minus Going to Rho Lepton Anti-neutrino at ARGUS

出版	McGill University Libraries, 1991
URL	http://books.google.com.hk/books?id=PM30oQEACAAJ&hl=&source=gbs_api

註釋"Data taken with the ARGUS detector at DESY, Hamburg, specifically BB pairs produced from $e sp+e sp-$ collisions at the energy of the $ Upsilon$(4S) resonance, are used to investigate the decay channel $B sp- to rho sp0 ell sp- bar nu.$ Observation of a signal would be conclusive evidence that the CKM matrix element $V sb{ub}$ is non-zero, a necessary condition for the validity of the Kobayashi-Maskawa explanation for CP violation. The recoil mass technique is employed to try to isolate signal events. Monte Carlo data are used to model the signal background, which is dominated by reasonably well understood $b to c$ decays. Using the model of Wirbel, Stech, and Bauer, a model-dependent upper limit of 1.6 $ times$ 10$ sp{-2}$ is placed on the value of $ vert V sb{ub} vert$ at 90% confidence. The results, however, suggest that further study of the $b to c$ background is warranted. In particular, B meson transitions to states with higher mass than the $D sp*$ may contribute significantly."--