test of lepton universality in beauty quark decays nature

Aaij, R. et al. Mar 22, 2019. Phys. References to the extensive literature describing these new physics models can be found in the Supplementary Information. In this paper, a measurement of the RK ratio is presented based on protonproton collision data collected with the LHCb detector at the CERNs Large Hadron Collider (Methods). J. The standard model (SM) of particle physics provides precise predictions for the properties and interactions of fundamental particles, which have been confirmed by numerous experiments since the inception of the model in the 1960s. A. D 97, 072013 (2018). In addition to affecting the decay rates, new physics can also alter how the decay products are distributed in phase space. J. Phys. The selection requirements applied to the non-resonant and resonant decays are otherwise identical. Differential branching fractions and isospin asymmetries of BK(*)+ decays. D 89, 074014 (2014). As the detector signature of each resonant decay is similar to that of its corresponding non-resonant decay, systematic uncertainties that would otherwise dominate the calculation of these efficiencies are suppressed. Reassessing the discovery potential of the B + K + + l + +l - decays in the large-recoil region: SM challenges and BSM opportunities, Physical Review D93: 014028. arXiv:1412.3183. Article Aaltonen, T. et al. Eur. Previous measurements have shown that a wide range of particle decays are consistent with this principle of lepton universality. J. Extended Data Fig. Phys. Google Scholar. Prog. In addition, if the simulation is correctly calibrated, the measured rJ/ value will not depend on any variable. Lett. Phys. Google Scholar. D 2, 12851292 (1970). Measurement of CP-averaged observables in the B0K*0+ decay. To take into account the correlation between the selection efficiencies, the m(K+e+e) and m(K++) distributions of non-resonant candidates in each of the different trigger categories and data-taking periods are fitted simultaneously, with a common value of RK. Aaij, R. et al. The SM is unable to explain cosmological observations of the dominance of matter over antimatter, the apparent dark matter content of the Universe, or the patterns seen in the interaction strengths of the particles. Phys. Preprint at https://arxiv.org/abs/1406.0566 (2014). J. Test of lepton universality in beauty-quark decays LHCb Collaboration Roel Aaij( NIKHEF, Amsterdam Show All(961) Mar 22, 2021 25 pages Published in: Nature Phys.18(2022)3,277-282 Published: Mar 15, 2022 e-Print: 2103.11769[hep-ex] DOI: 10.1038/s41567-021-01478-8 Report number: LHCb-PAPER-2021-004, CERN-EP-2021-042 Experiments: CERN-LHC-LHCb 4 Likelihood function from the fit to the nonresonant. Hirose, S. et al. Rev. Lepton-flavor-dependent angular analysis of BK*+. The B+ hadron contains a beauty antiquark, \(\overline{b}\), and the K+ a strange antiquark, \(\overline{s}\), such that at the quark level the decay involves a \(\overline{b}\to \overline{s}\) transition. The systematic uncertainty (Methods) from the choice of signal and background mass-shape models in the fits is estimated by fitting pseudo-experiments with alternative models that still describe the data well. LHCb explores the beauty of lepton universality | CERN Following the procedure described in refs. EPJ Web Conf. Ser. Serra, N., Silva Coutinho, R. & van Dyk, D. Measuring the breaking of lepton flavor universality in BK*+. Rev. For the non-resonant muon mode and for each of the three different trigger categories of the non-resonant electron mode, a single BDT classifier is trained for the 7 and 8TeV data, and an additional classifier is trained for the 13TeV data. 2019, 89 (2019). Wei J.-T. et al. The region between the dashed vertical lines is rejected. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France, M. Chefdeville,D. Decamp,A. G. Downes,Ph. Extensions to the SM that aim to address many of its shortfalls predict new virtual particles that could contribute to \(\overline{b}\to \overline{s}\) transitions (Fig. Rev. Phys. Rev. Sato, Y. et al. The 3,85070 B+K++ decay candidates that are observed are used to compute the B+K++ branching fraction as a function of q2. Phys. Energy Phys. In the software trigger, the tracks of the final-state particles are required to form a displaced vertex with good fit quality. These decays all proceed via the same \(\overline{b}\to \overline{s}\) quark transition, and the results have therefore further increased interest in measurements of angular observables24,25,26,27,28,29,30,31,32,33,34 and branching fractions35,36,37,38 of decays mediated by \(\overline{b}\to \overline{s}{\mu }^{+}{\mu }^{-}\) transitions. Eur. Previous measurements have shown that a wide range of particle decays are consistent with this principle of lepton universality. Clemencic, M. et al. Phys. Phys. B 781, 517541 (2018). An unbinned extended maximum-likelihood fit is made to the m(K+e+e) and m(K++) distributions of non-resonant candidates. $$B_{\mathrm{s}}^0$$ Lyon, J., & Zwicky, R. Resonances gone topsy turvythe charm of QCD or new physics in bs+? Correlations between different categories of selected events and data-taking periods are taken into account in these constraints. & Tech. The Belle II physics book. High. Test of lepton universality using B 0 K S 0 l + l- and B + K* + l + l- decays.. Today at the CERN seminar and at the Rencontres de Blois the LHCb Collaboration presented new tests of lepton universality, one of the basic principles of the Standard Model (SM) of particle physics. Such studies can help to explain the matter-antimatter asymmetryof the Universe. An electron that emits a bremsstrahlung photon due to interactions with the material of the detector downstream of the dipole magnet results in the photon and electron depositing their energy in the same ECAL cells and therefore in a correct measurement of the original energy of the electron in the ECAL. The LHCbdetector at the LHC. Publishers note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Test of Lepton Flavour Universality using a measurement of R(D*) with LHCb collaboration et al. Conversely, the non-resonant distributions show the projections from the simultaneous fit across data-taking periods and trigger categories that is used to obtain RK. Test of lepton universality using \({\Lambda }_{b}^{0}\to p{K}^{-}{\ell }^{+}{\ell }^{-}\) decays. Anyone you share the following link with will be able to read this content: Sorry, a shareable link is not currently available for this article. Beaujean, F., Bobeth, C. & van Dyk, D. Comprehensive Bayesian analysis of rare (semi)leptonic and radiative B decays. Again, no significant trend is seen. The four signal modes are modelled by multiple Gaussian functions with power-law tails on both sides of the peak91,92, although the differing detector response gives different shapes for the electron and muon modes.

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