Straub, D. M. flavio: a python package for flavour and precision phenomenology in the standard model and beyond. The trigger response is corrected using weights applied to simulation as a function of variables relevant to the trigger algorithms. Phys. Differential branching fraction and angular analysis of the decay B0K+I+in the \({K}_{0,2}^{* }{(1430)}^{0}\) region. 2014, 125 (2014). 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 measurements are of processes in which a beauty meson transforms into a strange meson with . Phys. C 79, 719 (2019). The mass distributions are shown in Extended Data Fig. To take into account residual differences in the signal shape between data and simulation, an offset in the peak position and a scaling of the resolution are allowed to vary in the fits to the resonant modes. Nucl. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France, M. Chefdeville,D. Decamp,A. G. Downes,Ph. There are excellent prospects for all of the above and further measurements with the much larger samples that will be collected with the upgraded LHCb detector from 2022 and, in the longer term, with the LHCb Upgrade II71. Phys. Test of lepton-flavor universality in BK*+ decays at Belle. Geant4: a simulation toolkit. D 68, 094016 (2003). Aubert, B. et al. Bordone, M., Isidori, G. & Pattori, A. Confirmation of any effect beyond the SM will clearly require independent evidence from a wide range of sources. 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. This double ratio is expected to be close to unity2 and is determined to be 0.9970.011, where the uncertainty includes both statistical and systematic effects, the former of which dominates. Other sources of systematic uncertainty, such as the calibration of B+ production kinematics, the trigger calibration and the determination of the particle identification efficiencies, contribute at the few-permille or permille level, depending strongly on the data-taking period and the trigger category. reco. The LHCb collaboration et al. CERN experiment found that beauty quarks not behaving in the way they Capdevila, B., Descotes-Genon, S., Matias, J. Energy Phys. & Tech. Lett. D 93, 014028 (2016). B The muon BDT classifier has similar performance. These two processes are separated by applying a requirement on q2. Likhomanenko, T. et al. The results indicate that particles are not behaving in the way they should. 0 Classification and Regression Trees (Wadsworth, 1984). Lepton avour universality tests in electroweak penguin decays at LHCb Rev. Ser. 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. The calibration samples consist of D*+D0(K+)+, J/+ and B+J/(e+e)K+ decays, from which kaons, muons and electrons, respectively, can be selected without applying particle identification requirements. 3. Measurement of \({{{\mathcal{R}}}}(D)\) and \({{{\mathcal{R}}}}({D}^{* })\) with a semileptonic tagging method. In addition, a 0.2% systematic uncertainty is assigned for the potential contribution from partially reconstructed decays with two additional pions. Publishers note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Martin, B. R., and Shaw, G. (2017). The profile likelihood is given in Methods. Since the associated data storage and analysis costs would be prohibitive, the experiment does not record all collisions. Lett. In summary, in the dilepton mass-squared region 1.1Test of lepton universality in beauty-quark decays 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. References to the extensive literature describing these new physics models can be found in the Supplementary Information. Sjstrand, T., Mrenna, S. & Skands, P. PYTHIA 6.4 physics and manual. The particles are required to originate from a common vertex, displaced from the protonproton interaction point, with good vertex-fit quality. For the electron modes, in addition to combinatorial background, other specific background decays contribute significantly in the signal region. Although this may not be happening, it suggests a new study by the LHCb Collaboration at CERN. D 96 (2017) 095010 [ arXiv:1704.06659] [ INSPIRE ]. Distribution of m(K+e+e) in simulated B+K+e+e decays. D 2, 12851292 (1970). Marks,D. J. Unverzagt,U. Uwer,C. Wang,L. Witola&A. Zhelezov, Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, A. Artamonov,K. Belous,Y. Guz,S. Kholodenko,V. Obraztsov,S. Poslavskii,V. Romanovskiy,M. Shapkin,O. Stenyakin&O. Yushchenko, M. Artuso,B. Batsukh,A. Beiter,H. C. Bernstein,S. Blusk,S. Ely,Z. Li,X. Liang,R. Mountain,M. E. Olivares,T. T. H. Pham,M. Poliakova,I. Polyakov,M. S. Rudolph,J. D. Shupperd,T. Skwarnicki,S. Stone,A. Venkateswaran,M. Wilkinson,H. Wu,Y. Yao&X. Yuan, Yandex School of Data Analysis, Moscow, Russia, K. Arzymatov,V. Belavin,M. Borisyak,T. Gaintseva,A. Philippov,S. Popov,F. Ratnikov&A. Ustyuzhanin, Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France, E. Aslanides,J. Cerasoli,J. Cogan,D. Gerstel,R. Le Gac,O. Leroy,G. Mancinelli,C. Meaux,P. K. Resmi,A. Poluektov,R. I. Rabadan Trejo&D. Vom Bruch, Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France, B. Audurier,V. Balagura,F. Fleuret,F. A. Garcia Rosales&E. Maurice, Institute of Physics, Ecole Polytechnique Fdrale de Lausanne (EPFL), Lausanne, Switzerland, M. Bachmayer,A. Fan,J. Lees, J. P. et al. Uncertainties on the data points are statistical only and represent one standard deviation, calculated assuming Poisson-distributed entries. Recent evidence of a possible fifth force of nature Nat. 4 Likelihood function from the fit to the nonresonant. 2006, 026 (2006). The rJ/ ratio is therefore also computed as a function of different kinematic variables. 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 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. CMS collaboration Angular analysis of the decay B0K*0+ from pp collisions at \(\sqrt{s}=8\) TeV. Rev. Hirose, S. et al. 125, 011802 (2020). which does not benefit from the same cancellation of systematic effects. D 95, 035029 (2017). Search for B+K++ at the BaBar experiment. Aaij, R. et al. Similarly, the differing q2 resolution between data and simulation, which alters estimates of the q2 migration, has negligible impact on the result. High. Has a new particle called a 'leptoquark' been spotted at CERN? - Reddit Background from other exclusive B-hadron decays requires at least two particles to be misidentified. Phys. Google Scholar. J. B 781, 517541 (2018). The B+ momentum vector is required to be aligned with the vector connecting one of the PVs in the event (below referred to as the associated PV) and the B+ decay vertex. refers to partially reconstructed B hadron decays. Phys. High Energy Phys. 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. The latter also tend to accumulate around specific values of m(K++). Control channels are used to calibrate the simulation to correct for the imperfect modelling of the B+ production kinematics and various aspects of the detector response. 12, 131 (2014). J. Such background is reduced to a negligible level by particle identification criteria. In the electron minimum pT spectra, the structure at 2800 MeV/c is related to the trigger threshold. J. Angular analysis of the B+K*++ decay. Uncertainties on the data points are the combination of statistical and systematic and represent one standard deviation. D 89, 074014 (2014). Measurable quantities can be predicted precisely in the decays of a charged beauty hadron, B+, into a charged kaon, K+, and two charged leptons, +. D 73, 092001 (2006). Thank you for visiting nature.com. 2). LHCb data used in this analysis will be released according to the LHCb external data access policy, which can be downloaded from http://opendata.cern.ch/record/410/files/LHCb-Data-Policy.pdf. In the electron case, a 40MeV c2 window around the D0 mass is used to reject candidates where the veto is applied without the bremsstrahlung recovery, that is, on the basis of only the measured track momenta. B. Zonneveld, Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania, L. Cojocariu,A. Ene,L. Giubega,A. Grecu,F. Maciuc,V. Placinta&M. Straticiuc, L. Congedo,M. De Serio,R. A. Fini,A. Palano,M. Pappagallo,A. Pastore&S. Simone, L. Congedo,M. De Serio,M. Pappagallo&S. Simone, Los Alamos National Laboratory (LANL), Los Alamos, NM, USA, J. Crkovsk,C. L. Da Silva,C. T. Dean,J. M. Durham,E. Epple&G. J. Kunde, Van Swinderen Institute, University of Groningen, Groningen, Netherlands, K. De Bruyn,C. J. G. Onderwater&M. van Veghel, Universiteit Maastricht, Maastricht, Netherlands, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakw, Poland, A. Dendek,M. Firlej,T. Fiutowski,M. Idzik,P. Kopciewicz,W. Krupa,O. Madejczyk,M. W. Majewski,J. Moron,A. Oblakowska-Mucha,B. Rachwal,J. Ryzka,K. Swientek&T. Szumlak, F. Dettori,C. Giugliano,G. Manca,R. Oldeman&B. Saitta, Eotvos Lorand University, Budapest, Hungary, Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine, V. Dobishuk,S. Koliiev,I. Kostiuk,O. Kot&V. Pugatch, School of Physics, University College Dublin, Dublin, Ireland, A. M. Donohoe,L. Mcconnell,R. McNulty,N. V. Raab&C. B. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Lett. Test of lepton universality in beauty-quark decays . 112, 212003 (2014). 124, 161803 (2020). Pion electronic decay and lepton universality - ResearchGate For the RK measurement, candidate events are required to have passed a hardware trigger algorithm that selects either a high-pT muon, or an electron, hadron or photon with high transverse energy deposited in the calorimeters. The 1.9% uncertainty on the B+J/K+ branching fraction2 gives rise to the dominant systematic uncertainty. Each top (antitop) quark decays almost immediately into a bottom b ( b) quark and a W+ ( W -) boson, and we have reexamined those events in which one of the W bosons decays into a charged. Rev. J. Instrum. After the application of the selection requirements, the resonant and non-resonant decays are clearly visible in the mass distributions (Fig. Bobeth, C., Hiller, G. & Piranishvili, G. Angular distributions of \(\bar{B}\to K\bar{\ell }\ell\) decays. Slider with three articles shown per slide. Methods A 506, 250303 (2003). J. This is the most precise measurement of this ratio to date and is compatible with the SM prediction with a P value of 0.10%.
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