7 research outputs found

    Search for the rare decays B-s(0) -> e(+) e(-) and B-0 -> e(+) e(-)

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    A search for the decays B 0 s → e + e − and B 0 → e + e − is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and 2     fb − 1 , respectively. No signal is observed. Assuming no contribution from B 0 → e + e − decays, an upper limit on the branching fraction B ( B 0 s → e + e − ) < 9.4 ( 11.2 ) × 10 − 9 is obtained at 90(95)% confidence level. If no B 0 s → e + e − contribution is assumed, a limit of B ( B 0 → e + e − ) < 2.5 ( 3.0 ) × 10 − 9 is determined at 90(95)% confidence level. These upper limits are more than one order of magnitude lower than the previous values

    Commissioning and first tests of the MAGIC telescope

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    Major Atmospheric Gamma Imaging Cherenkov telescope is starting its operations with a set of engineering runs to tune the telescope subsystem elements to be ready for the first physics campaign. Many technical improvements have been developed and implemented in several elements of the telescope to reach the lowest energy threshold ever obtained by an Imaging Atmospheric Cherenkov Telescope. A general description of the telescope is presented. the commissioning of the telescope´s elements is described and the expected performances are reviewed with the final detector set-up

    Measurement of CP-Averaged Observables in the B-0 -> K-star 0 mu(+)mu(-) Decay

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    An angular analysis of the B-0 -&gt; K-0 (-&gt; K+pi(-))mu(+)mu(-) decay is presented using a dataset corresponding to an integrated luminosity of 4.7 fb(-1) of pp collision data collected with the LHCb experiment. The full set of CP-averaged observables are determined in bins of the invariant mass squared of the dimuon system. Contamination from decays with the K+ pi(-) system in an S-wave configuration is taken into account. The tension seen between the previous LHCb results and the standard model predictions persists with the new data. The precise value of the significance of this tension depends on the choice of theory nuisance parameters

    Evolution of Sequence-based Bioinformatics Tools for Protein-protein Interaction Prediction

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