Branching Fraction Measurements of the Rare <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>ϕ</mml:mi><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml:mi>f</mml:mi><mml:mn>2</mml:mn><mml:mo>′</mml:mo></mml:msubsup><mml:mo stretchy="false">(</mml:mo><mml:mn>1525</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> Decays
R. AaijNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsC. 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 KingdomH. AfsharniaUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceC. A. AidalaUniversity of Michigan, Ann Arbor, USA (associated with Syracuse University, Syracuse, New York, USA)S. AiolaINFN Sezione di Milano, Milano, ItalyZ. AjaltouniUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceS. AkarUniversity of Cincinnati, Cincinnati, Ohio, USAJ. 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, SpainZ. AlioucheDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomG. AlkhazovPetersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, RussiaP. Álvarez CartelleCavendish Laboratory, University of Cambridge, Cambridge, United KingdomS. AmatoUniversidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, BrazilY. AmhisUniversité Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, FranceL. AnEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandL. AnINFN Sezione di Firenze, Firenze, ItalyA. AndreianovPetersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, RussiaM. AndreottiINFN Sezione di Ferrara, Ferrara, ItalyF. ArchilliPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyA. ArtamonovInstitute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, RussiaM. ArtusoSyracuse University, Syracuse, New York, USAK. ArzymatovYandex School of Data Analysis, Moscow, RussiaE. AslanidesAix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, FranceM. AtzeniPhysik-Institut, Universität Zürich, Zürich, SwitzerlandB. AudurierLaboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, FranceS. BachmannPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. J. BackInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandJ. J. BackDepartment of Physics, University of Warwick, Coventry, United KingdomP. Baladrón RodríguezInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainV. BalaguraLaboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, FranceW. BaldiniINFN Sezione di Ferrara, Ferrara, ItalyJ. Baptista de Souza LeiteCentro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, BrazilR. J. BarlowDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomS. BarsukUniversité Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, FranceW. BarterImperial College London, London, United KingdomM. BartoliniINFN Sezione di Genova, Genova, ItalyF. BaryshnikovNational University of Science and Technology "MISIS", Moscow, Russia (associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia)J. M. BaselsI. Physikalisches Institut, RWTH Aachen University, Aachen, GermanyG. BassiINFN Sezione di Pisa, Pisa, ItalyB. BatsukhSyracuse University, Syracuse, New York, USAA. BattigFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyA. BayInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandM. 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. BelavinYandex School of Data Analysis, Moscow, RussiaA. BeiterINFN Sezione di Cagliari, Monserrato, ItalyV. BelléeInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandK. BelousInstitute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, RussiaI. BelovInstitute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, RussiaI. BelyaevInstitute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, RussiaG. BencivenniINFN Laboratori Nazionali di Frascati, Frascati, ItalyE. Ben-HaimLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceA. BerezhnoyInstitute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, RussiaR. BernetPhysik-Institut, Universität Zürich, Zürich, SwitzerlandD. BerninghoffPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyH. C. BernsteinSyracuse University, Syracuse, New York, USAC. BertellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA. BertolinUniversita degli Studi di Padova, Universita e INFN, Padova, Padova, ItalyC. BetancourtPhysik-Institut, Universität Zürich, Zürich, SwitzerlandF. BettiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandIa. BezshyikoPhysik-Institut, Universität Zürich, Zürich, SwitzerlandS. BhasinH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomJ. 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, GermanyS. BifaniUniversity of Birmingham, Birmingham, United KingdomP. BilloirLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceM. 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. BizzetiINFN Sezione di Firenze, Firenze, ItalyM. BjørnDepartment of Physics, University of Oxford, Oxford, United KingdomM. P. BlagoEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandT. BlakeDepartment of Physics, University of Warwick, Coventry, United KingdomF. BlancInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandS. 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 GarcíaInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainT. BoettcherUniversity of Cincinnati, Cincinnati, Ohio, USAA. BoldyrevNational Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia)A. BondarBudker Institute of Nuclear Physics (SB RAS), Novosibirsk, RussiaN. BondarEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandS. BorghiDepartment of Physics and Astronomy, University of Manchester, Manchester, United KingdomM. BorisyakYandex School of Data Analysis, Moscow, RussiaM. BorsatoPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. T. BorsukHenryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, PolandS. A. BouchibaInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandT. J. V. BowcockOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomA. BoyerEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandC. BozziINFN Sezione di Ferrara, Ferrara, ItalyM. J. BradleyImperial College London, London, United KingdomS. BraunUniversity of Maryland, College Park, Maryland, USA
2021lv
ABI
Аннотация
The branching fraction of the rare ${B}_{s}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay is measured using data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and $6\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, respectively. The branching fraction is reported in intervals of ${q}^{2}$, the square of the dimuon invariant mass. In the ${q}^{2}$ region between 1.1 and $6.0\text{ }\text{ }{\mathrm{GeV}}^{2}/{c}^{4}$, the measurement is found to lie 3.6 standard deviations below a standard model prediction based on a combination of light cone sum rule and lattice QCD calculations. In addition, the first observation of the rare ${B}_{s}^{0}\ensuremath{\rightarrow}{f}_{2}^{\ensuremath{'}}(1525){\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay is reported with a statistical significance of 9 standard deviations and its branching fraction is determined.
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