test of lepton universality in beauty quark decays nature

The analogous ratio has also been measured for \({\Lambda }_{b}^{0}\) decays with H=pK and is compatible with unity at the level of one standard deviation23. Phys. Since the associated data storage and analysis costs would be prohibitive, the experiment does not record all collisions. 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. 2018, 47 (2018). A. J. Novel Tests of Lepton Universality Boost Evidence for 'New Physics Sign up for the Nature Briefing newsletter what matters in science, free to your inbox daily. J. Phys. Rev. These two processes are separated by applying a requirement on q2. Uncertainties on the data points are statistical only and represent one standard deviation, calculated assuming Poisson-distributed entries. Provided by the Springer Nature SharedIt content-sharing initiative, Rendiconti Lincei. The consistency of this ratio with unity demonstrates control of the efficiencies well in excess of that needed for the determination of RK. A comparison with previous measurements is shown in Fig. Particle physicists have therefore been searching for new physics, that is, new particles and interactions that can explain the SMs shortcomings. Phys. Improved lepton universality measurements show agreement with the PDF Test of lepton universality in beauty-quark decays - DiVA portal Huschle, M. et al. Eur. LHCb collaboration et al. Rev. Hunter,T. P. Jones,M. Kenzie,M. Kreps,T. Latham,O. Lupton,E. Millard,A. G. Morris,B. Pagare,M. Ramos Pernas,N. Sahoo&M. Vesterinen, Centro Brasileiro de Pesquisas Fsicas (CBPF), Rio de Janeiro, Brazil, J. Baptista Leite,I. Bediaga,M. Cruz Torres,J. M. De Miranda,A. C. dos Reis,A. Gomes,A. Massafferri,G. Punzi&D. Torres Machado, W. Barter,M. Birch,M. J. Bradley,A. Golutvin,M. Hecker,F. Kress,T. Lin,M. McCann,R. D. Moise,R. Newcombe,M. Patel,M. Smith&D. Websdale, M. Bartolini,R. Cardinale,F. Fontanelli,A. Petrolini&A. Sergi, National University of Science and Technology MISIS, Moscow, Russia, F. Baryshnikov,S. Didenko,A. Golutvin,S. Gromov,A. Ishteev,A. Kondybayeva,S. Legotin,N. Polukhina,D. Saranin,I. Shchemerov,E. Shmanin,O. Steinkamp,D. Strekalina,E. Trifonova,E. Ursov&E. van Herwijnen, I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany, J. M. Basels,L. Carus,S. Escher,A. Guth,J. Heuel,T. Kirn,S. Kretzschmar,C. Langenbruch,M. Materok,S. Nieswand,S. Schael,E. Smith&V. Zhukov, G. Bassi,F. Bedeschi,F. Lazzari,A. Lusiani,M. J. Morello,L. Pica,M. Rama,R. Ribatti,G. Tuci&J. Walsh, INFN Sezione di Cagliari, Monserrato, Italy, S. Belin,D. Brundu,S. Cadeddu,A. Cardini,A. Contu,F. Dettori,F. Dordei,M. Garau,A. Lai,A. Lampis,R. Litvinov,A. Loi,G. Manca,P. Muzzetto,R. Oldeman,B. Saitta&J. Lepton universality is the idea that all three types of charged lepton particles - electrons, muons and taus - interact in the same way with other particles. J. Prog. Test of lepton universality using B+K++ decays. MathSciNet One method to search for new physics is to compare measurements of the properties of hadron decays, where hadrons are bound states of quarks, with their SM predictions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction. Energy Phys. The B+ production kinematics are corrected using B+J/(+)K+ events. 12th Annual Conference on Computational Learning Theory, COLT 99 203208 (ACM, 1999). Zenodo https://doi.org/10.5281/zenodo.4587748. 1. J. A significant proportion (0.7%) of this uncertainty comes from the limited knowledge of the K spectrum in B(0,+)K+(,0)e+e decays. Altmannshofer, W., Niehoff, C., Stangl, P. & Straub, D. M. Status of the BK*+ anomaly after Moriond 2017. D 102, 055001 (2020). They involve the transformation of a beauty quark into a strange quark (bs), a process that is highly suppressed in the SM and can be affected by the existence of new particles. The distribution of this ratio as a function of the angle between the leptons and the minimum pT of the leptons is shown in Extended Data Fig. In both cases, for both signal and background, the efficiency of the BDT selection has negligible dependence on m(K++) and q2 in the regions used to determine the event yields. Test of lepton universality in beauty-quark decays The Standard Model predicts that this occurs via electroweak bosons and the W + and Z 0 particles. This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on proton-proton collision data collected with . The Standard Model of particle physics predicts that particles called beauty quarks, which are measured in the LHCb experiment, should decay into either muons or electrons in equal measure. 109, 101802 (2012). Likhomanenko, T. et al. Sci. Wei J.-T. et al. J. Rev. Phys. D 73, 092001 (2006). Measurements from Run 1 of decays of beauty hadrons at the LHCb experiment, in addition to earlier results from the B-facto - Beauty quarks test lepton universality A series of measurements from LHCb and B-factory experiments have tested whether the interactions of charged leptons agree with the Standard Model. (Right, with linear y-scale) the mass is computed only from the track information. Distribution of m(K+e+e) in simulated B+K+e+e decays. Towards the discovery of new physics with lepton-universality ratios of bs decays. Nucl. Such a modification can be realized in new physics models with an additional heavy neutral boson or with leptoquarks. 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. Rev. Measurement of the branching ratio of \({B}^{0}\to \ \ {D}^{(*)}{\tau }^{-}{\overline{\nu }}_{\tau }\) relative to \(\overline{B}\to \ \ {D}^{(*)}{\ell }^{-}{\overline{\nu }}_{\ell }\) decays with hadronic tagging at Belle. & Virto, J. Assessing lepton-flavour non-universality from BK* angular analyses. On the impact of power corrections in the prediction of BK*+ observables. Aaij, R. et al. J. Instrum. Explore our virtual experience An angular analysis of the electron mode, where SM-like behaviour might be expected in the light of the present results and those from \(\overline{b}\to \overline{s}{\mu }^{+}{\mu }^{-}\) decays, would allow the formation of ratios between observable quantities other than branching fractions, enabling further precise tests of lepton universality16,18,31,67,68. The particles are required to originate from a common vertex, with good vertex-fit quality, that is displaced significantly from all of the PVs in the event. Rev. Measurements of the angular distributions in the decays BK(*)+ at CDF. Program of Guangzhou (China); RFBR, RSF and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). High Energy Phys. Phys. In summary, in the dilepton mass-squared region 1.1\) as a function of B+ pT demonstrates control of the efficiencies. 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. For decays with H=K+ and H=K*0 such ratios, denoted by RK and RK*0, respectively, have previously been measured by the Large Hadron Collider beauty (LHCb)11,12, Belle13,14 and BaBar15 collaborations. and JavaScript. 08, 098 (2016). Test of lepton universality in beauty-quark decays LHCb collaboration Abstract The Standard Model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. The 1.1

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