Observation of the rare $B^0_s\to\mu^+\mu^-$ decay from the combined analysis of CMS and LHCb data
Vardan Khachatryan,A. M. Sirunyan,A. Tumasyan, W. Adam, T. Bergauer,M Dragicevic,J Eroe,M Friedl, Rudolf Fruehwirth,V M Ghete, C Hartl, N Hoermann, J Hrubec,M Jeitler, W Kiesenhofer,V Knuenz,M Krammer, I Kraetschmer, D Liko, I Mikulec,Dinyar Rabady,Babak Rahbaran, H Rohringer, R Schoefbeck, Jennifer L Strauss, Wolfgang Treberertreberspurg,Wolfgang Waltenberger,Ce Wulz, Vladimir Mossolov, N Shumeiko,Sara Alderweireldt,Sunil Bansal,Tom Cornelis,E A De Wolf, X Janssen, A Knutsson, Jasper Lauwers,Sten Luyckx, S Ochesanu, R Rougny,M Van De Klundert,H Van Haevermaet,P Van Mechelen,N Van Remortel,A Van Spilbeeck, F Blekman,S Blyweert, J D Hondt, Nadir Daci,Natalie Heracleous,J Keaveney,Steven Lowette,Michael Maes, Annik Olbrechts, Quentin Python,D Strom,S Tavernier,W Van Doninck,P Van Mulders,G P Van Onsem,I Villella,Cecile Caillol,Barbara Clerbaux,G De Lentdecker, D Dobur, Laurent Favart, Arnaud Gay, A Grebenyuk,A Leonard, Abdollah Mohammadi,Luca Pernie,A Randleconde, T Reis,Tomislav Seva, Laura N Thomas,C Vander Velde,Pascal Vanlaer,Jun Wang,Florian Zenoni,Volker Adler,Kelly Beernaert,Leonardo Benucci,Anna Cimmino, S Costantini, Shannon Crucy,Sven Dildick, A Fagot,Joseph Mccartin,A A Ocampo Rios, D Ryckbosch, Sinem Salva Diblen,M Sigamani,Nadja Strobbe,Filip Thyssen,Michael Tytgat,Efe Yazgan, N Zaganidis, Suzan Basegmez, Camille Beluffi,G Bruno, Roberto Castello,Adrien Caudron,Ludivine Ceard,G G Da Silveira,Christophe Delaere,T Du Pree,Denis Favart, Laurent Forthomme,Andrea Giammanco, Jonathan Hollar,Abideh Jafari, Pavel Jez,Matthias Komm,Vincent Lemaitre, Claude Nuttens,D Pagano, Lucia Perrini,Arnaud Pin, Krzysztof Piotrzkowski,A V Popov, Loic Quertenmont,Michele Selvaggi,M Vidal Marono,J M Vizan Garcia, Nikita Beliy,Thierry Caebergs, E Daubie,Gregory Habib Hammad,W L Alda Junior, G A Alves, Luiz Fernando Brito,M Correa Martins Junior,T Dos Reis Martins,C Mora Herrera, M E Pol, P Rebello Teles,Werther Brunow De Carvalho,Jose Chinellato, Analu Custodio, E M Da Costa,D De Jesus Damiao, S Fonseca De Souza,Helena Malbouisson,D Matos Figueiredo, L Mundim, H Nogima,W L Prado Da Silva, J Santaolalla, A Santoro, A Sznajder,E J Tonelli Manganote,A Vilela Pereira,Cesar Augusto Bernardes,Sunil Dogra,T R Fernandez Perez Tomei,E M Gregores, P G Mercadante,S F Novaes,Sandra S Padula,A Aleksandrov, Vladimir Genchev, Roumyana Hadjiiska, P Iaydjiev,A Marinov,Stefan Piperov, M Rodozov, G Sultanov, Mariana Vutova, Anton Dimitrov, I Glushkov,L Litov, Borislav Pavlov,Peicho Petkov,J G Bian,G M Chen,H S Chen,Min Chen, Tianmin Cheng,Rui Du, C H Jiang, Roko Plestina,Francesco Romeo,Jianning Tao, Z Wang,Chayanit Asawatangtrakuldee,Yongchan Ban, Quinn Li,S Liu, Yuanli Mao,S J Qian, Dapeng Wang, Zongli Xu,Wen Zou, C Avila,A Cabrera, L F Chaparro Sierra,C Florez, Jonatan Piedra Gomez,B Gomez Moreno, J C Sanabria, N Godinovic, D Lelas, Dunja Polic, I Puljak,Zeljko Antunovic,Marko Kovac, V Brigljevic, K Kadija, Jelena Luetic, D Mekterovic, Lucija Sudic,Alexandros Attikis, Georgios Mavromanolakis, J Mousa, Charalambos Nicolaou, Fotios Ptochos, P A Razis, Martin Bodlak, Michael Finger, Y Assran,A Ellithi Kamel, M A Mahmoud, Amr Radi,Mario Kadastik, Marion Murumaa,Martti Raidal, Andres Tiko, P Eerola,Giacomo Fedi, M Voutilainen, J Harkonen, V Karimaki,R Kinnunen,Matti J Kortelainen,T Lampen, K Lassilaperini, S Lehti, Tomas Linden,Panjariina Luukka, T Maenpaa, Timo Peltola,Eija Tuominen, J Tuominiemi,Esa Tuovinen,L Wendland,Joonas Talvitie, T Tuuva, M Besancon, F Couderc, M Dejardin, D Denegri, B Fabbro, J L Faure, C Favaro, F Ferri, S Ganjour, A Givernaud, P Gras,G Hamel De Monchenault, P Jarry, E Locci, J Malcles, J Rander, A Rosowsky, M Titov, S Baffioni, F Beaudette, P Busson, C Charlot, T Dahms,Mykhailo Dalchenko, L Dobrzynski, Nicolas Filipovic,Alice Florent,R Granier De Cassagnac,Luca Mastrolorenzo, P Mine, C Mironov, Ivo Nicolas Naranjo, M Nguyen, C Ochando,Giacomo Ortona, P Paganini,Simon Regnard,R Salerno,Jeanbaptiste Sauvan, Y Sirois, C Veelken,Yetkin Yilmaz, A Zabi,Jl Agram,J Andrea, A Aubin, D Bloch,Jm Brom, E C Chabert,Charles D Collard, E Conte,Jc Fontaine, D Gele, U Goerlach, Christophe Goetzmann,Ac Le Bihan, Kirill Skovpen,P Van Hove,S Gadrat, S Beauceron, N Beaupere, G Boudoul,E Bouvier,Sebastien Brochet,C A Carrillo Montoya, J Chasserat, R Chierici, D Contardo, P Depasse,H El Mamouni,J Fan,J Fay, S Gascon, M Gouzevitch, B Ille, T Kurca,M Lethuillier, L Mirabito,S Perries, J D Ruiz Alvarez, D Sabes, Louis Sgandurra,V Sordini,M Vander Donckt,P Verdier,S Viret,Huasheng Xiao,Zviad Tsamalaidze, C Autermann,Sarah Beranek, M Bontenackels,Matthias Edelhoff, L Feld, A Heister, Otto Hindrichs, K U Klein,Andrey Ostapchuk, F Raupach,Jan Sammet, S Schael, Janfrederik Schulte, B Wittmer, Valery Zhukov,Metin Ata,Michael Brodski,Erik Dietzlaursonn, Deborah Duchardt, M Erdmann,Richard W Fischer, A Gueth, T Hebbeker, Carsten Heidemann, K Hoepfner,Dennis Klingebiel,Simon Knutzen,Peter Kreuzer, M Merschmeyer,Philipp Millet,Mark Olschewski, Klaas Padeken,Paul Papacz, H 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Martinez Vidal,A Oyanguren,P Ruiz Valls, C Sanchez Mayordomo,C J G Onderwater, H W Wilschut,E Pesen
NATURE（2015）
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摘要
The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strange B meson (B-s(0)) and the B-0 meson decaying into two oppositely charged muons (mu(+) and mu(-)) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B-s(0)->mu(+)mu(-) and B-0 ->mu(+)mu(-) decays are very rare, with about four of the former occurring for every billion B-s(0) mesons produced, and one of the latter occurring for every ten billion B-0 mesons(1). A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb(Large Hadron Collider beauty) collaborations have performed a joint analysis of the data from proton-proton collisions that they collected in 2011 at a centre-of-mass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B-s(0)->mu(+)mu(-) decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B-0 ->mu(+)mu(-) decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton-proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B-s(0) and B-0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.
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branching ratio
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