1,083 research outputs found

    Electroweak Penguin B Decays at Belle

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    We summarise the most recent results of the Belle experiment about flavour changing neutral current (FCNC) radiative and (semi-) leptonic B decays. In particular, we report about the first observation of the decays B->K*l+l-, B->phi K gamma, the inclusive B->Xs l+l-$. We also report about searches for B->l+l- decay and for CP asymmetries in B->K*gamma.Comment: Proceeding for EPS 2003, Aachen, Germany, July 17 - 23, 200

    Heavy Flavour Results at the LHC

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    We present a brief overview of the first flavour physics results at the LHC. Cross-section for charm and beauty production have been measured by several experiments and the first competitive results on D and B decays are presented.Comment: Proceedings of the XXXI Physics in Collision Conference, Vancouver, Canada, August 28 - September 1, 201

    CP violation and CKM studies (and first LHCb Run II results)

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    The LHC is the new b-hadron factory and will be dominating flavour physics until the start of Belle II, and beyond in many decay modes. While the BB factories and Tevatron experiments are still analysing their data, ATLAS, CMS and LHCb are producing interesting new results in CP violation and rare decays, that set strong constraints on models beyond that SM and exhibit some discrepancies with the SM predictions. The LHCb collaboration used the LHC 50 ns ramp-up period of July 2015 to measure the double-differential J/ψJ/\psi, J/ψJ/\psi-from-bb-hadron and charm cross-sections at s=13\sqrt{s} = 13 TeV. Both measurements were performed directly on triggered candidates using a reduced data format that does not require offline processing.Comment: Proceedings of the EPS-HEP conference 2015, Vienn

    CKM studies from b physics at hadron machines

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    In absence of direct signs of new physics at the LHC, flavour physics provides an ideal laboratory to look for deviations from the Standard Model and explore an energy regime beyond the LHC reach. Here, new results in CP violation and rare decays are presented.Comment: Proceedings of the 8th International Workshop on the CKM Unitarity Triangle (CKM 2014), Vienna, Austria, September 8-12, 2014, on behalf of the LHCb collaboratio

    Precision physics with heavy-flavoured hadrons

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    The understanding of flavour dynamics is one of the key aims of elementary particle physics. The last 15 years have witnessed the triumph of the Kobayashi-Maskawa mechanism, which describes all flavour changing transitions of quarks in the Standard Model. This important milestone has been reached owing to a series of experiments, in particular to those operating at the so-called BB factories, at the Tevatron, and now at the LHC. We briefly review status and perspectives of flavour physics, highlighting the results where the LHC has given the most significant contributions, notably including the recent observation of the Bs0→Ό+Ό−B_s^0\to\mu^+\mu^- decayComment: 31 pages, 10 figures in 60 Years of CERN Experiments and Discoveries, Advanced Series on Directions in High Energy Physics 23 (2015), World Scientific Publishin

    Quantum Machine Learning for bb-jet charge identification

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    Machine Learning algorithms have played an important role in hadronic jet classification problems. The large variety of models applied to Large Hadron Collider data has demonstrated that there is still room for improvement. In this context Quantum Machine Learning is a new and almost unexplored methodology, where the intrinsic properties of quantum computation could be used to exploit particles correlations for improving the jet classification performance. In this paper, we present a brand new approach to identify if a jet contains a hadron formed by a bb or bˉ\bar{b} quark at the moment of production, based on a Variational Quantum Classifier applied to simulated data of the LHCb experiment. Quantum models are trained and evaluated using LHCb simulation. The jet identification performance is compared with a Deep Neural Network model to assess which method gives the better performance