Results 1 - 10 of 8822
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[en] We show prospects for research of invisible decays of B meson in a sample of about 470 millions BB pairs recorded with the BABAR detector at the SLAC PEP-II B factory. The Standard Model predictions for a B decay with completely invisible final products (or with a single photon as detectable particle) are far from the current experimental sensitivities but several New Physics Models predict significant enhancements on the branching ratio of these decays. The analysis technique consists in the reconstruction of a semileptonic B decay on one side and in the search of missing energy or missing energy plus one photon in the recoil. We will describe the search techniques and provide the expected sensitivities for these decays.
[en] We briefly review the discovery of the first b-flavored particle, the B-meson, and derive limits for its mass. The decay properties of the B-meson have been studied at CESR with the CUSB detector. The decay B → eνX has been observed as well as copious K-meson production. Both the shape of the electron spectrum and the K-meson signal imply dominance of the (bc)W coupling relative to the (bu)W coupling
[en] We have re-evaluated the results of the neutron lifetime experiment based on storage of decay protons in a Penning trap. Combining improved statistical treatment of the data with precise measurements of the magnetic-field distribution in the trap, we arrive at a revised value τn = 889.2 ± 4.8 s. (orig.)
[en] An overview of the indirect constraints from flavour physics on supersymmetric models is presented. During the past few years flavour data, and in particular b→sγ transitions, have been extensively used in order to constrain supersymmetric parameter spaces. We will briefly illustrate here the constraints obtained by a collection of low energy observables including, rare decays, leptonic and semileptonic decays of B mesons, as well as leptonic decays of K and Ds mesons. The SuperIso program which is dedicated to flavour physics observable calculations is also described briefly.