test of lepton universality in beauty quark decays nature

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The EvtGen particle decay simulation package. A test statistic is constructed that is based on the likelihood ratio between two hypotheses with common (null) or different (test) RK values for the part of the sample analysed previously (7, 8 and part of the 13TeV data) and for the new portion of the 13TeV data. Bay,V. Bellee,F. Blanc,S. A. Bouchiba,S. Celani,S. Cholak,M. De Cian,S. Ek-In,L. Ferreira Lopes,E. Graverini,G. Haefeli,D. Hill,V. S. Kirsebom,V. Macko,M. Marinangeli,T. Nakada,T. Nanut,T. D. Nguyen,C. Nguyen-Mau,G. Pietrzyk,F. Redi,A. Uncertainties on the data points are statistical only and represent one standard deviation. High Energy Phys. Background from decays with a photon converted into an e+e pair are also negligible due to the q2 selection. A. Measurement of the differential branching fraction and forward-backward asymmetry for BK(*)+. Slider with three articles shown per slide. Rev. Search for lepton-universality violation in B+K++ decays. A distinctive feature of the SM is that the different leptons, electron (e), muon () and tau (\(\tau^{-}\)), have the same interaction strengths. The LHCb collaboration et al. Rev. & Rusov, A. V. BsK and B(s)(K)+ decays at large recoil and CKM matrix elements. Ablikim, M. et al. 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. Angular analysis of \({B}_{d}^{0}\to {K}^{* }{\mu }^{+}{\mu }^{-}\) decays in pp collisions at \(\sqrt{s}=8\) TeV with the ATLAS detector. Pion electronic decay and lepton universality License CC BY 4.0 Authors: Dinko Pocanic Abstract In common with a number of simple processes involving elementary particles, charged pion decays. Emerging patterns of new physics with and without lepton flavour universal contributions. The uncertainties on parameters used in the simulation model of the signal decays affect the q2 distribution and hence the selection efficiency. Lett. Test of lepton universality in beauty-quark decays, arXiv:2103.1176 . 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 LHCb detector at CERN's Large Hadron Collider. D 92, 075022 (2015). This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on protonproton collision data collected with the LHCb detector at CERNs Large Hadron Collider. Hurth, T., Mahmoudi, F. & Neshatpour, S. Implications of the new LHCb angular analysis of BK*+: hadronic effects or new physics? Sun&Z. Yang, Guangdong Provencial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, China, Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia, A. Butkevich,S. Filippov,E. Gushchin,L. Kravchuk&S. Luchuk, R. Calabrese,M. Fiorini,P. Griffith,E. Luppi,L. Minzoni,L. L. Pappalardo,I. Slazyk&L. Tomassetti, INFN Sezione di Milano-Bicocca, Milano, Italy, M. Calvi,S. Capelli,P. Carniti,D. Fazzini,J. Garca Pardias,C. Gotti,M. Martinelli,C. Matteuzzi,S. Meloni&E. B. Shields, Universit di Milano Bicocca, Milano, Italy, M. Calvi,S. Capelli,P. Carniti,D. Fazzini,J. Garca Pardias,L. Martinazzoli,M. Martinelli,S. Meloni&E. B. Shields, DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain, M. Calvo Gomez,A. Camboni,E. Golobardes,N. Valls Canudas&X. Vilasis-Cardona, University of Chinese Academy of Sciences, Beijing, China, A. F. Campoverde Quezada,Y. which does not benefit from the same cancellation of systematic effects. 2. High Energy Phys. No significant trend is observed in the differential determination of rJ/ as a function of any considered variable. 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. 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. 2 Nonresonant candidates invariant mass distributions. Eur. The selection requirements applied to the non-resonant and resonant decays are otherwise identical. LHCb is a specialized b-physicsexperiment, designed primarily to measure the parameters of CP violationin the interactions of b-hadrons(heavy particles containing a bottom quark). 2019, 123C01 (2019); erratum 2020, 029201 (2020). 2016, 65 (2016). Charpentier,G. Ciezarek,M. Clemencic,J. Closier,V. Coco,P. Collins,T. Colombo,G. Corti,B. Couturier,C. DAmbrosio,P. dArgent,H. Dijkstra,L. Dufour,P. Durante,T. Evans,M. Fo,M. Ferro-Luzzi,R. Forty,M. Frank,C. Frei,W. Funk,S. Gambetta,C. Gaspar,C. Giugliano,E. L. Gkougkousis,E. Govorkova,L. A. Granado Cardoso,T. Gys,C. Haen,J. Haimberger,C. Hasse,M. Hatch,A. M. Hennequin,R. Jacobsson,S. Jakobsen,D. Johnson,B. Jost,N. Jurik,M. Karacson,F. Keizer,R. D. Krawczyk,D. Lacarrere,R. Lindner,B. Malecki,C. Marin Benito,L. Martinazzoli,R. Matev,Z. Mathe,M. Mazurek,M. Mikhasenko,M. Milovanovic,D. S. Mitzel,F. Muheim,M. Mulder,D. Mller,P. Muzzetto,N. Neufeld,P. R. Pais,A. Pearce,M. Pepe Altarelli,M. Petric,F. Pisani,S. Ponce,D. Popov,L. Promberger,P. Roloff,T. Ruf,M. Salomoni,H. Schindler,B. Schmidt,A. Schopper,R. Schwemmer,P. Seyfert,F. Stagni,S. Stahl,M. Szymanski,F. Teubert,E. Thomas,N. Tuning,A. Valassi,C. Vzquez Sierra,K. Wyllie&O. Zenaiev, School of Physics and Astronomy, University of Glasgow, Glasgow, UK, M. Alexander,D. Bobulska,G. Coombs,L. Douglas,L. Eklund,D. A. Friday,I. Longstaff,M. Petric,G. Sarpis,M. Schiller,F. J. P. Soler&P. Spradlin, ICCUB, Universitat de Barcelona, Barcelona, Spain, A. Alfonso Albero,A. Camboni,J. M. Fernandez-tenllado Arribas,P. Garcia Moreno,L. Garrido,P. Gironella Gironell,S. Gomez Fernandez,E. Graugs,J. Mauricio&D. Sanchez Gonzalo, Department of Physics and Astronomy, University of Manchester, Manchester, UK, Z. Aliouche,R. J. Barlow,A. Bitadze,S. Borghi,J. L. Cobbledick,A. Davis,O. Phys. The LHCb collaboration et al. The PVs are reconstructed by searching for space points where an accumulation of track trajectories is observed. The double ratio of branching fractions, R(2S), defined by. 120, 121801 (2018). High Energy Phys. Distribution of the invariant mass m(K++) for nonresonant candidates in the (left) sample previously analysed11 and (right) the new data sample. 8 Candidate invariant mass distributions. B-decay discrepancies after Moriond 2019. Test of lepton-flavor universality in BK*+ decays at Belle. D 86, 032012 (2012). Phys. The Large Hadron Collider beauty collaboration reports a test of lepton flavour universality in decays of bottom mesons into strange mesons and a charged lepton pair, finding evidence of a violation of this principle postulated in the standard model. Cascade background of the form \(B\to {H}_{c}(\to {K}^{+}{\ell }^{-}{\overline{\nu }}_{\ell }X){\ell }^{+}{\nu }_{\ell }Y\), where Hc is a hadron containing a c quark (D0, D+, \({D}_{s}^{+}\), \({\Lambda }_{c}^{+}\)), and X, Y are particles that are not included in the B+ candidate, are suppressed by requiring that the kaonlepton invariant mass is in the region m(K+)>\(m_{D^0}\), where \(m_{D^0}\) is the known D0 mass2. Particle Data Group et al. LHCb collaboration Physics case for an LHCb upgrade IIopportunities in flavour physics, and beyond, in the HL-LHC era. 113, 151601 (2014). & Virto, J. Assessing lepton-flavour non-universality from BK* angular analyses. EOS version 0.3.3. The vertical dashed line indicates the SM prediction. A multivariate algorithm is used for the identification of displaced vertices consistent with the decay of a B hadron77,78. The profile likelihood for the fit to the non-resonant decays is shown in Extended Data Fig. Differential branching fraction and angular analysis of \({\Lambda }_{b}^{0}\to \Lambda {\mu }^{+}{\mu }^{-}\) decays. 1 (left). If material is not included in the articles Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. In the measurement of the rJ/ ratio, the systematic uncertainty is dominated by the imperfect modelling of the B+ production kinematics and the modelling of selection requirements, which have a negligible impact on the RK measurement. For the muon modes, the superior mass resolution allows a fit in a reduced m(K++) mass range compared with the electron modes. LHCb topological trigger reoptimization. Lett. Phys. The latter also tend to accumulate around specific values of m(K++). Get the most important science stories of the day, free in your inbox. Again, no significant trend is seen. CMS collaboration Angular analysis of the decay B0K*0+ from pp collisions at \(\sqrt{s}=8\) TeV. To help overcome the challenge of modelling precisely the different electron and muon reconstruction efficiencies, the branching fractions of B+K++ decays are measured relative to those of B+J/K+ decays64. Capdevila, B., Descotes-Genon, S., Matias, J. Internet Explorer). To avoid unconscious bias, the analysis procedure was developed and the cross-checks described below performed before the result for RK was examined. Measurements of the angular distributions in the decays BK(*)+ at CDF. The y-axis in each figure shows the number of candidates in an interval of the indicated width. Uncertainties on the data points are statistical only and represent one standard deviation. The determination of the rJ/ ratio requires control of the relative selection efficiencies for the resonant electron and muon modes and does not therefore benefit from the cancellation of systematic effects in the double ratio used to measure RK. 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. Altmannshofer, W. & Straub, D. M. New physics in BK*? The analysis strategy aims to reduce systematic uncertainties induced in modelling the markedly different reconstruction of decays with muons in the final state, compared with decays with electrons. Phys. On the standard model predictions for RK and \({R}_{{K}^{* }}\). Assuming that the observed rJ/ variation in such distributions reflects genuine mis-modelling of the efficiencies, rather than statistical fluctuations, and taking into account the spectrum of the relevant variables in the non-resonant decay modes, a total shift on RK is computed for each of the variables examined. reco. The techniques used to identify the different particles and to form B+ candidates are described in Methods. The particle identification performance is calibrated using data, where the species of particles in the final state can be unambiguously determined purely on the basis of the kinematics. 3. 124, 161803 (2020). Belyaev, I. et al. Eur. 0 A. Bertolin. J. J. All contributing authors, as listed at the end of the manuscript, have contributed to the publication, being variously involved in the design and construction of the detector, writing software, calibrating sub-systems, operating the detector, acquiring data and analysing the processed data. In all fits, the combinatorial background is modelled with an exponential function with a freely varying yield and shape. Global analysis of bs anomalies. Lett. In Proc. The effect on RK is at the 1% level. Nature Physics thanks Akimasa Ishikawa, Marcella Bona and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. 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.

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