test of lepton universality in beauty quark decays nature

J. 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. D 88, 032007 (2013). This causes misidentification backgrounds to populate a range of K masses but only a peak in the Ke mass. Lett. 126, 161802 (2021). B. Coelho,F. Desse,F. Machefert,E. M. Niel,P. Robbe,M. H. Schune&G. Wormser, L. Anderlini,A. Bizzeti,G. Graziani,S. Mariani,G. Passaleva&M. Veltri, M. Andreotti,W. Baldini,C. Bozzi,R. Calabrese,M. Fiorini,E. Franzoso,C. Giugliano,P. Griffith,M. Guarise,S. Kotriakhova,E. Luppi,A. Minotti,L. Minzoni,I. Neri,L. L. Pappalardo,B. Passalacqua,B. G. Siddi,I. Slazyk,L. Tomassetti&S. Vecchi, Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Heidelberg, Germany, F. Archilli,S. Bachmann,D. Berninghoff,M. Borsato,G. Frau,D. Gerick,J. P. Grabowski,P. A. Gnther,X. Han,S. Hansmann-Menzemer,J. Hu,R. Kopecna,B. Leverington,P. Li,H. Malygina,J. Rev. Measurement of CP-averaged observables in the B0K*0+ decay. High. The calibrated simulation is used subsequently to obtain the m(K++) mass shape and relative fractions of these background components. 24, 01025 (2020). Differential branching fractions and isospin asymmetries of BK(*)+ decays. The measurement made by the LHCb team compares two types of decays of beauty quarks. 4 has been added to the HEPData platform at https://www.hepdata.net/record/ins1852846?version=1. 11, and only the main analysis steps are reviewed here. ISSN 1745-2481 (online) We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (the Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and NERSC (United States). 4. No significant trend is observed in the differential determination of rJ/ as a function of any considered variable. A. Test of lepton universality in beauty-quark decays - NASA/ADS The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. Today at the Rencontres de Moriond EW conference, the LHCb Collaboration presented an updated measurement of the ratio R K, an important test of a principle of the Standard Model of particle physics known as " lepton universality ", which states that the Standard Model treats the three charged leptons (electrons, muons and . 2014, 125 (2014). The muon BDT classifier has similar performance. Since the J/+ branching fractions are known to respect lepton universality to within 0.4% (refs. New result from the LHCb experiment challenges leading theory in physics Nat. Ghez,J. F. Marchand,M.-N. Minard,B. Pietrzyk,B. Quintana,M. Reboud&S. TJampens, Center for High Energy Physics, Tsinghua University, Beijing, China, C. Chen,J. Phys. Measurement of the electron reconstruction efficiency at LHCb. CERN experiment found that beauty quarks not behaving in the way they Phys. In the electron minimum pT spectra, the structure at 2800 MeV/c is related to the trigger threshold. For the electron modes that dictate the RK precision, this requirement reduces the combinatorial background by approximately 99% while retaining 85% of the signal mode. 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. Phys. LHCb collaboration, Test of lepton universality in beauty-quark decays, Nature Phys. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction. 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%. 2019, 123C01 (2019); erratum 2020, 029201 (2020). provides an independent validation of the double-ratio analysis procedure and further tests the control of the efficiencies. Serra, N., Silva Coutinho, R. & van Dyk, D. Measuring the breaking of lepton flavor universality in BK*+. $$\overline B_{\mathrm{s}}^0$$ 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. where the first uncertainty is statistical and the second systematic. The analysis technique used to obtain the results presented in this paper is essentially identical to that used to obtain the previous LHCb RK measurement, described in ref. The value of RK is a fit parameter, which is related to the signal yields and efficiencies according to. . Lett. The pT spectrum of the B+J/K+ decays is similar to that of the corresponding B+K++ decays such that the measurement of rJ/ tests the kinematic region relevant for the RK measurement. Sun, Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia, I. Belov,A. Berezhnoy,I. V. Gorelov,M. Korolev,A. Leflat,N. Nikitin,D. Savrina&V. Zhukov, Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, I. Belyaev,A. Danilina,V. Egorychev,D. Golubkov,P. Gorbounov,A. Konoplyannikov,T. Kvaratskheliya,V. Matiunin,T. Ovsiannikova,D. Pereima,D. Savrina,A. Semennikov&A. Smetkina, INFN Laboratori Nazionali di Frascati, Frascati, Italy, G. Bencivenni,L. Calero Diaz,S. Cali,P. Campana,P. Ciambrone,P. De Simone,P. Di Nezza,M. Giovannetti,G. Lanfranchi,G. Morello,M. Palutan,M. Poli Lener,M. Rotondo,M. Santimaria&B. Sciascia, LPNHE, Sorbonne Universit, Paris Diderot Sorbonne Paris Cit, CNRS/IN2P3, Paris, France, E. Ben-Haim,P. Billoir,L. Calefice,M. Charles,L. Del Buono,S. Esen,M. Fontana,V. V. Gligorov,T. Grammatico,F. Polci,R. Quagliani,D. Y. Tou,P. Vincent&S. G. Weber, Universita degli Studi di Padova, Universita e INFN, Padova, Padova, Italy, A. Bertolin,D. Lucchesi,M. Morandin,L. Sestini,G. Simi&D. Zuliani, Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Krakw, Poland, J. Bhom,J. T. Borsuk,J. Brodzicka,A. Chernov,M. Chrzaszcz,M. W. Dudek,A. Dziurda,M. Goncerz,M. Jezabek,W. Kucewicz,M. Kucharczyk,T. Lesiak,J. J. Malczewski,A. Ossowska,K. Prasanth,M. Witek&M. Zdybal, School of Physics and Technology, Wuhan University, Wuhan, China, L. Bian,H. Cai,B. Fang,X. Huang,L. Sun&J. Wang, S. Bifani,R. Calladine,G. Chatzikonstantinidis,N. Cooke,J. Plews,M. W. Slater,P. N. Swallow&N. K. Watson, Universit di Modena e Reggio Emilia, Modena, Italy, Department of Physics, University of Oxford, Oxford, UK, M. Bjrn,K. M. Fischer,F. Goncalves Abrantes,B. R. Gruberg Cazon,T. H. Hancock,N. Harnew,M. John,L. Li,S. Malde,R. A. Mohammed,C. H. Murphy,T. Pajero,M. Pili,H. Pullen,V. Renaudin,A. Rollings,L. G. Scantlebury Smead,J. C. Smallwood,F. Suljik,G. Wilkinson&Y. Zhang, Massachusetts Institute of Technology, Cambridge, MA, USA, T. Boettcher,D. C. Craik,O. Kitouni,C. Weisser&M. Williams, National Research University Higher School of Economics, Moscow, Russia, A. Boldyrev,D. Derkach,M. Hushchyn,M. Karpov,A. Maevskiy,F. Ratnikov,A. Ryzhikov&A. Ustyuzhanin, Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia, A. Bondar,S. Eidelman,P. Krokovny,V. Kudryavtsev,T. Maltsev,L. Shekhtman&V. Vorobyev, University of Maryland, College Park, MD, USA, S. Braun,A. D. Fernez,M. Franco Sevilla,P. M. Hamilton,A. Jawahery,W. Parker,Y.

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