Bordone, M., Isidori, G. & Pattori, A. Similarly, computations of the rJ/ ratio in bins of two kinematic variables also do not show any trend and are consistent with the systematic uncertainties assigned on the RK measurement. van Dyk, D et al. For the electron modes, a wider mass region is needed to perform an accurate fit, but the range chosen suppresses any significant contribution from decays with two or more additional pions that are not reconstructed. Internet Explorer). Similarly, the differing q2 resolution between data and simulation, which alters estimates of the q2 migration, has negligible impact on the result. Lett. Measurement of angular asymmetries in the decays BK*+. Fan,J. PDF Beauty quarks test lepton universality - cds.cern.ch Such a modification can be realized in new physics models with an additional heavy neutral boson or with leptoquarks. Novel Tests of Lepton Universality Boost Evidence for 'New Physics Right: a possible new physics contribution to the decay with a hypothetical leptoquark (LQ) which, unlike the electroweak bosons, could have different interaction strengths with the different types of leptons. Use the Previous and Next buttons to navigate the slides or the slide controller buttons at the end to navigate through each slide. 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. B We investigate the phenomenology of an ALP with flavor-changing couplings, and present a comprehensive analysis of quark and lepton flavor-changing observables within a general ALP effective field theory. The fit projections for the m(K++) and mJ/(K++) distributions are shown in Fig. Measurements of other RH observables with the full LHCb dataset will provide further information on the quark-level processes measured. Beaujean, F., Bobeth, C. & van Dyk, D. Comprehensive Bayesian analysis of rare (semi)leptonic and radiative B decays. LHCb explores the beauty of lepton universality | CERN Phys. Search for lepton-universality violation in B+K++ decays. Rev. Phys. For the modelling of non-resonant and resonant partially reconstructed backgrounds, data are used to correct the simulated K mass spectrum for B(0,+)K+(,0)e+e and B(0,+)J/(e+e)K+(,0) decays93. Uncertainties on the data points are statistical only and represent one standard deviation. 2010, 89 (2010). D 86, 032012 (2012). Test of lepton universality in beauty-quark decays . Phys. So far, LHCb has collected 260 billion bottom-quark antiquark pairs in experimental runs using protons with 7 and 8 tera-electron-volt (TeV) center-of-mass energies. The veto requirements retain 97% of B+K++ and 95% of B+K+e+e decays passing all other selection requirements. 4 Likelihood function from the fit to the nonresonant. Individual groups or members have received support from ARC and ARDC (Australia); AvH Foundation (Germany); EPLANET, Marie Skodowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, Labex P2IO and OCEVU, and Rgion Auvergne-Rhne-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. Phys. D 96 (2017) 095010 [ arXiv:1704.06659] [ INSPIRE ]. D 88, 032007 (2013). This is the most precise measurement of this quantity to date and, given the large (\({{{\mathcal{O}}}}(10 \%)\)) theoretical uncertainty on the predictions7,66, is consistent with the SM. 1. LHCb collaboration et al. The theory predicts that the different charged leptons, the electron, muon and tau, have . & Atwood, D. Rate difference between bs+ and bse+e in supersymmetry with large tan . Phys. The dominant such background for the non-resonant and resonant modes comes from partially reconstructed B(0,+)K+(,0)e+e and B(0,+)J/(e+e)K+(,0) decays, respectively, where the pion is not included in the B+ candidate. 2). Nucl. Test of lepton universality using B 0 K S0 l + l - and B + K* + l + l - decays. Only potentially interesting events, selected using real-time event filters referred to as triggers, are recorded. J. The rJ/ single ratio is used to perform a number of additional cross-checks. D 68, 094016 (2003). High. Phys. High Energy Phys. The only exception to this is due to the Higgs field, since the leptonHiggs interaction strength gives rise to the differing lepton masses m>m>me. The efficiency of the non-resonant B+K+e+e decay therefore needs to be known only relative to that of the resonant B+J/(e+e)K+ decay, rather than relative to the B+K++ decay. Different types of charged particles are distinguished using information from two ring-imaging Cherenkov detectors, a calorimeter and a muon system76. Zenodo https://doi.org/10.5281/zenodo.4587748. The y-axis in each figure shows the number of candidates in an interval of the indicated width. Phys. D 102, 055001 (2020). Aaij, R. et al. Eur. Test of lepton universality in beauty-quark decays (Journal Article The yields observed in these four decay modes and the ratios of efficiencies determined from simulated events then enable an RK measurement with statistically dominated uncertainties. Steven D. Bass, Albert De Roeck & Marumi Kado, Nature Physics Pseudo-experiments are also used to assess the degree of bias originating from the fitting procedure. Measurement of branching fractions and rate asymmetries in the rare decays BK(*)+. White&G. Zunica, Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia, G. Alkhazov,A. Andreianov,N. Bondar,A. Chubykin,V. Chulikov,A. Dzyuba,D. Ilin,A. Inglessi,K. Ivshin,S. Kotriakhova,P. Kravchenko,O. Maev,D. Maisuzenko,N. Sagidova,A. Solovev,I. Solovyev,A. Vorobyev&N. Voropaev, Cavendish Laboratory, University of Cambridge, Cambridge, UK, P. Alvarez Cartelle,F. C. R. Bishop,H. V. Cliff,B. Delaney,V. Gibson,C. R. Jones,G. H. Lovell,J. G. Smeaton,I. Williams&S. A. Wotton, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil, S. Amato,L. De Paula,F. Ferreira Rodrigues,M. Gandelman,A. Hicheur,J. H. Lopes,L. Meyer Garcia,I. Nasteva,J. M. Otalora Goicochea,E. Polycarpo,M. S. Rangel,F. L. Souza De Almeida&B. Souza De Paula, Universit Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France, Y. Amhis,S. Barsuk,J. Hirose, S. et al. Rev. Phys. 2017, 055 (2017). Commun. In the fits to non-resonant B+K+e+e candidates, the mass shape of the background from B+J/(e+e)K+ decays with an emitted photon that is not reconstructed is also taken from simulation and, adjusting for the relevant selection efficiency, its yield is constrained to the value from the fit to the resonant mode within its uncertainty.
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