Measurement of lepton universality parameters in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>−</mml:mo></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mo>*</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mo>ℓ</mml:mo><mml:mo>−</mml:mo></mml:msup></mml:math> decays
R. AaijNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsA. S. W. AbdelmottelebDepartment of Physics, University of Warwick, Coventry, United KingdomC. Abellán BetetaPhysik-Institut, Universität Zürich, Zürich, SwitzerlandT. AckernleyOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomB. AdevaInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainM. AdinolfiH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomP. AdlarsonDepartment of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)C. AgapopoulouUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceC. AidalaUniversity of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)Z. AjaltouniUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceS. AkarUniversity of Cincinnati, Cincinnati, Ohio, USAK. Carvalho AkibaNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsP. AlbicoccoINFN Laboratori Nazionali di Frascati, Frascati, ItalyJ. AlbrechtFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyF. AlessioEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. AlexanderSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomA. Alfonso AlberoICCUB, Universitat de Barcelona, Barcelona, SpainZakariya AlioucheDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomP. Álvarez CartelleCavendish Laboratory, University of Cambridge, Cambridge, United KingdomR. AmalricLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceS. AmatoUniversidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, BrazilS. AmatoH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomY. AmhisEuropean Organization for Nuclear ResearchL. AnEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandL. AnINFN Sezione di Firenze, Firenze, ItalyM. AnderssonPhysik-Institut, Universität Zürich, Zürich, SwitzerlandA. AndreianovAffiliated with an institute covered by a cooperation agreement with CERNM. AndreottiINFN Sezione di Ferrara, Ferrara, ItalyD. AndreouSyracuse University, Syracuse, New York, USAD. AoUniversity of Chinese Academy of Sciences, Beijing, ChinaF. ArchilliINFN Sezione di Roma Tor Vergata, Roma, ItalyA. ArtamonovAffiliated with an institute covered by a cooperation agreement with CERNM. ArtusoSyracuse University, Syracuse, New York, USAE. AslanidesAix Marseille Université, CNRS/IN2P3, CPPM, Marseille, FranceM. AtzeniPhysik-Institut, Universität Zürich, Zürich, SwitzerlandB. AudurierLaboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, FranceI. BachillerUniversité Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, FranceS. BachmannPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyMarie BachmayerInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandJ. J. BackDepartment of Physics, University of Warwick, Coventry, United KingdomA. Bailly-reyreLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceP. Baladrón RodríguezInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainV. BalaguraLaboratoire Leprince-RinguetW. BaldiniEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandJ. Baptista de Souza LeiteCentro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, BrazilM. BarbettiINFN Sezione di Firenze, Firenze, ItalyR. J. BarlowDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomS. BarsukUniversité Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, FranceW. BarterSchool of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomM. BartoliniCavendish Laboratory, University of Cambridge, Cambridge, United KingdomF. BaryshnikovAffiliated with an institute covered by a cooperation agreement with CERNJ. M. BaselsI. Physikalisches Institut, RWTH Aachen University, Aachen, GermanyG. BassiINFN Sezione di Pisa, Pisa, ItalyB. BatsukhInstitute Of High Energy Physics (IHEP), Beijing, ChinaA. BattigFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyA. BayInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandA. BeckDepartment of Physics, University of Warwick, Coventry, United KingdomM. BeckerFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyF. BedeschiINFN Sezione di Pisa, Pisa, ItalyI. BediagaCentro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, BrazilA. BeiterSyracuse University, Syracuse, New York, USAV. BelléePhysik-Institut, Universität Zürich, Zürich, SwitzerlandK. BelousAffiliated with an institute covered by a cooperation agreement with CERNI. BelovAffiliated with an institute covered by a cooperation agreement with CERNI. BelyaevAffiliated with an institute covered by a cooperation agreement with CERNG. BenaneAix Marseille Université, CNRS/IN2P3, CPPM, Marseille, FranceG. BencivenniINFN Laboratori Nazionali di Frascati, Frascati, ItalyE. Ben-HaimUniversité Paris CitéA. BerezhnoyAffiliated with an institute covered by a cooperation agreement with CERNR. BernetPhysik-Institut, Universität Zürich, Zürich, SwitzerlandH. C. BernsteinDS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain)D. BerninghoffPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyC. BertellaDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. BertolinUniversità degli Studi di Padova, Università e INFN, Padova, ItalyC. BetancourtPhysik-Institut, Universität Zürich, Zürich, SwitzerlandF. BettiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandIa. BezshyikoPhysik-Institut, Universität Zürich, Zürich, SwitzerlandJ. BhomHenryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, PolandL. BianSchool of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)M. S. BiekerFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyN. V. BiesuzINFN Sezione di Ferrara, Ferrara, ItalyS. BifaniUniversity of Birmingham, Birmingham, United KingdomP. BilloirLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceA. BiolchiniNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsM. BirchImperial College London, London, United KingdomF. C. R. BishopCavendish Laboratory, University of Cambridge, Cambridge, United KingdomA. BitadzeDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. BizzetiCavendish Laboratory, University of Cambridge, Cambridge, United KingdomMichele Piero BlagoCavendish Laboratory, University of Cambridge, Cambridge, United KingdomT. BlakeDepartment of Physics, University of Warwick, Coventry, United KingdomF. BlancInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandJ. E. BlankFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyS. BluskSyracuse University, Syracuse, New York, USAD. BobulskaSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomJ. A. BoelhauveFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyO. Boente GarcíaLaboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
2023lv
ABI
Annotatsiya
A simultaneous analysis of the B+→K+l+l- and B0→K∗0l+l- decays is performed to test muon-electron universality in two ranges of the square of the dilepton invariant mass, q2. The measurement uses a sample of beauty meson decays produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb-1. A sequence of multivariate selections and strict particle identification requirements produce a higher signal purity and a better statistical sensitivity per unit luminosity than previous LHCb lepton universality tests using the same decay modes. Residual backgrounds due to misidentified hadronic decays are studied using data and included in the fit model. Each of the four lepton universality measurements reported is either the first in the given q2 interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model. © 2023 CERN. for the LHCb Collaboration. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
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