Observation of the rare $$B^0_s\to\mu^+\mu^-$$ decay from the combined analysis of CMS and LHCb data
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A joint measurement is presented of the branching fractions $$B^0_s\to\mu^+\mu^-$$ and $$B^0\to\mu^+\mu^-$$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $$B^0_s\to\mu^+\mu^-$$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Furthermore, evidence for the $$B^0\to\mu^+\mu^-$$ decay is obtained with a statistical significance of three standard deviations. The branching fraction measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM.
- Research Organization:
- ABC Federal U.; AGH-UST, Cracow; Aachen, Tech. Hochsch.; Adiyaman U.; Ain Shams U., Cairo; Alabama U.; Anadolu U.; Andes U., Bogota; Annecy, LAPP; Antwerp U.; Argonne National Laboratory (ANL), Argonne, IL (United States); Athens U.; Auckland U.; Bari Polytechnic; Bari U.; Basilicata U., Potenza; Baylor U.; Beijing, Inst. High Energy Phys.; Belgrade U.; Bhabha Atomic Res. Ctr.; Bhubaneswar, NISER; Birmingham U.; Bogazici U.; Bologna U.; Boskovic Inst., Zagreb; Boston U.; Brandenburg Tech. U.; Bristol U.; Brown U.; Brunel U.; Brussels U.; Bucharest, IFIN-HH; Budapest, RMKI; CC, Villeurbanne; CCNU, Wuhan, Inst. Part. Phys.; CERN; CHEP, Taegu; CINVESTAV, IPN; Cag U., Mersin; Cagliari U.; Cairo U.; Cairo, Acad. Sci. Res. Tech.; Caltech; Cambridge U.; Cantabria Inst. of Phys.; Canterbury U.; Carnegie Mellon U.; Catania U.; Celal Bayar U.; Charles U.; Chonbuk Natl. U.; Chonnam Natl. U.; Chulalongkorn U.; Cincinnati U.; Clermont-Ferrand U.; Colombia, U. Natl.; Colorado U.; Cornell U.; Cracow, INP; Cukurova U.; Cyprus U.; DESY; Debrecen, Inst. Nucl. Res.; Delhi U.; Democritos Nucl. Res. Ctr.; Dubna, JINR; Ecole Polytechnique; Ecole Polytechnique, Lausanne; Edinburgh U.; Eotvos U.; Erzincan U.; Facolta di Ingegneria, Rome; Fairfield U.; Fayoum U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Ferrara U.; Florence U.; Florida Inst. Tech.; Florida Intl. U.; Florida State U.; Florida U.; Frascati; Gaziosmanpasa U.; Genoa U.; Gent U.; Glasgow U.; Guglielmo Marconi U.; Hamburg U.; Hanoi U. of Sci.; Haute Alsace U.; Heidelberg U.; Heidelberg, Max Planck Inst.; Helsinki Inst. of Phys.; Helsinki U.; IFM-UMSNH, Michoacan; INFN, Bari; INFN, Bologna; INFN, Cagliari; INFN, Catania; INFN, Ferrara; INFN, Florence; INFN, Genoa; INFN, Milan; INFN, Milan Bicocca; INFN, Naples; INFN, Padua; INFN, Pavia; INFN, Perugia; INFN, Pisa; INFN, Rome; INFN, Rome2; INFN, Trieste; INFN, Turin; IPM, Tehran; IRFU, Saclay; Iberoamericana U.; Illinois U., Chicago; Imperial Coll., London; Ioannina U.; Iowa U.; Isfahan Tech. U.; Islamic Azad U., Sci. Res. Branch, Tehran; Istanbul, Tech. U.; Izmir Inst. Tech.; Jeddah U.; Johns Hopkins U.; KIT, Karlsruhe, EKP; Kafkas U.; Kangweon Natl. U.; Kansas State U.; Kansas U.; Kharkov, KIPT; Kiev, INR; Korea U.; Kurchatov Inst., Moscow; LIP, Lisbon; Lappeenranta U. Tech.; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lebedev Inst.; Liverpool U.; Louvain U.; Lyon, IPN; MIT; Madrid, Autonoma U.; Madrid, CIEMAT; Malaya U.; Manchester U.; Marmara U.; Marseille, CPPM; Maryland U.; Maryland U., College Park; Middle East Tech. U., Ankara; Milan Bicocca U.; Milan Polytechnic; Mimar Sinan U.; Minnesota U.; Minsk, High Energy Phys. Ctr.; Mississippi U.; Moscow State U.; Moscow, INR; Moscow, ITEP; NCBJ, Swierk; NICPB, Tallinn; NIKHEF, Amsterdam; Naples U.; Nebraska U.; Necmettin Erbakan U., Konya; Northeastern U.; Northwestern U.; Notre Dame U.; Novosibirsk State U.; Novosibirsk, IYF; Ohio State U.; Orsay, LAL; Oviedo U.; Oxford U.; Ozyegin U.; PSI, Villigen; Padua U.; Panjab U.; Paris U., VI-VII; Paris, IN2P3; Pavia U.; Peking U.; Peking U., CHEP; Perugia U.; Piemonte Orientale U., Novara; Pisa U.; Pisa, Scuola Normale Superiore; Princeton U.; Puebla U., Inst. Fis.; Puerto Rico U., Mayaguez; Purdue U.; Purdue U., Calumet; Quaid-i-Azam U.; Ramon Llull U., Barcelona; Rice U.; Rio de Janeiro Federal U.; Rio de Janeiro State U.; Rio de Janeiro, CBPF; Rio de Janeiro, Pont. U. Catol.; Rochester U.; Rockefeller U.; Rome U.; Rome U., Tor Vergata; Rostock U.; Ruhuna U.; Rutgers U., Piscataway; Rutherford; SINP, Moscow; SUNY, Buffalo; Saha Inst.; San Luis Potosi U.; Sao Paulo, IFT; Seoul Natl. U.; Seoul U.; Serpukhov, IHEP; Siena U.; Sofiya U.; Sofiya, Inst. Nucl. Res.; Southampton U.; Split Tech. U.; Split U.; St. Petersburg Polytechnic Inst.; St. Petersburg, INP; Strasbourg, IPHC; Suez Canal U.; Sultan Qaboos U.; Sungkyunkwan U.; Syracuse U.; TU Vienna; Taiwan, Natl. Central U.; Taiwan, Natl. Taiwan U.; Tata Inst.; Tbilisi State U.; Tech. U., Dortmund (main); Tennessee U.; Texas A&M U. Qatar, Doha; Texas A-M; Texas Tech.; Trento U.; Trieste U.; Tsinghua U., Beijing; Turin U.; U. Barcelona (main); U. Bern, AEC; U. Campinas; U. Debrecen, Inst. Phys.; U. Groningen, VSI; U. Milan (main); U. Modena (main); U. Mons; U. Padua (main); U. Pisa (main); U. Rome La Sapienza (main); U. Santiago de Compostela (main); U. Tehran, Coll. Engin.; U. Urbino (main); UC, Davis; UC, Riverside; UC, San Diego; UC, Santa Barbara; UCLA; UFTM, Uberaba; University Coll., Dublin; VINCA Inst. Nucl. Sci., Belgrade; Valencia U., IFIC; Vanderbilt U.; Vienna, OAW; Vilnius U.; Virginia U.; Visva Bharati U.; Vrije U., Amsterdam; Vrije U., Brussels; Warsaw U.; Warwick U.; Wayne State U.; Wisconsin U., Madison; Yerevan Phys. Inst.; Yildiz Tech. U.; Zurich U.; Zurich, ETH
- Sponsoring Organization:
- US Department of Energy
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1234865
- Report Number(s):
- CERN-PH-EP-2014-220; CMS-BPH-13-007; FERMILAB-PUB-14-489-CMS; LHCB-PAPER-2014-049; oai:inspirehep.net:1328493; arXiv:1411.4413
- Journal Information:
- Nature, Journal Name: Nature Vol. 522
- Country of Publication:
- United States
- Language:
- English
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