Analysis of rare B meson decays at the Japanese B meson factory experiment Belle exploiting new neural full reconstruction algorithms

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At B factories electrons and positrons are collided at an energy where almost always only a pair of B mesons is produced. The BELLE experiment at the Japanese accelerator KEKB holds the world record in reconstructed B mesons with a data set collected in the last 10 years. So far many analyses of this data have confirmed the Standard Model of Particle Physics to a large accuracy, including decay rates, particle antiparticle oscillations, and violations of the CP symmetry in accordance with the theory of Kobayashi and Maskawa, who were honoured in 2008 with the Nobel Prize. However, many popular extensions of the Standard Model, e.g. Supersymmetry, could show up if the measurements precision is further improved.The applicants have developed a new hierarchical reconstruction scheme of 1042 B decay channels, based on Bayesian statistics and a system of 71 neural networks, to maximise the data set with one fully reconstructed B meson. Applying this software we could more than double the effective luminosity for analyses relying on full reconstruction, corresponding to many years of additional data taking.With this proposal we wish to make sure that we can exploit our software innovation in terms of physics output. We propose to perform several data analyses on rare B decay especially profiting from the full reconstruction of B mesons, which is only possible at B factories and therefore complementary to other experiments to be performed in the near future, such as LHC including LHCb.