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Nature. 2015 Jun 4;522(7554):68-72.

Observation of the rare B(s)(0) →µ+µ− decay from the combined analysis of CMS and LHCb data.

Collaborators (2829)

Khachatryan V, Sirunyan A, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Erö J, Friedl M, Frühwirth R, Ghete VM, Hartl C, Hörmann N, Hrubec J, Jeitler M, Kiesenhofer W, Knünz V, Krammer M, Krätschmer I, Liko D, Mikulec I, Rabady D, Rahbaran B, Rohringer H, Schöfbeck R, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz CE, Mossolov V, Shumeiko N, Suarez Gonzalez J, Alderweireldt S, Bansal S, Cornelis T, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Luyckx S, Ochesanu S, Rougny R, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Blekman F, Blyweert S, D'Hondt J, Daci N, Heracleous N, Keaveney J, Lowette S, Maes M, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem GP, Villella I, Caillol C, Clerbaux B, De Lentdecker G, Dobur D, Favart L, Gay AP, Grebenyuk A, Léonard A, Mohammadi A, Perniè L, Randle-conde A, Reis T, Seva T, Thomas L, Vander Velde C, Vanlaer P, Wang J, Zenoni F, Adler V, Beernaert K, Benucci L, Cimmino A, Costantini S, Crucy S, Dildick S, Fagot A, Garcia G, Mccartin J, Ocampo Rios AA, Ryckbosch D, Salva Diblen S, Sigamani M, Strobbe N, Thyssen F, Tytgat M, Yazgan E, Zaganidis N, Basegmez S, Beluffi C, Bruno G, Castello R, Caudron A, Ceard L, Da Silveira GG, Delaere C, du Pree T, Favart D, Forthomme L, Giammanco A, Hollar J, Jafari A, Jez P, Komm M, Lemaitre V, Nuttens C, Pagano D, Perrini L, Pin A, Piotrzkowski K, Popov A, Quertenmont L, Selvaggi M, Vidal Marono M, Vizan Garcia JM, Beliy N, Caebergs T, Daubie E, Hammad GH, Aldá Júnior WL, Alves GA, Brito L, Correa Martins Junior M, Dos Reis Martins T, Mora Herrera C, Pol ME, Rebello Teles P, Carvalho W, Chinellato J, Custódio A, Da Costa EM, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Mundim L, Nogima H, Prado Da Silva WL, Santaolalla J, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Genchev V, Hadjiiska R, Iaydjiev P, Marinov A, Piperov S, Rodozov M, Sultanov G, Vutova M, Dimitrov A, Glushkov I, Litov L, Pavlov B, Petkov P, Bian JG, Chen GM, Chen HS, Chen M, Cheng T, Du R, Jiang CH, Plestina R, Romeo F, Tao J, Wang Z, Asawatangtrakuldee C, Ban Y, Li Q, Liu S, Mao Y, Qian SJ, Wang D, Xu Z, Zou W, Avila C, Cabrera A, Chaparro Sierra LF, Florez C, Gomez JP, Gomez Moreno B, Sanabria JC, Godinovic N, Lelas D, Polic D, Puljak I, Antunovic Z, Kovac M, Brigljevic V, Kadija K, Luetic J, Mekterovic D, Sudic L, Attikis A, Mavromanolakis G, Mousa J, Nicolaou C, Ptochos F, Razis PA, Bodlak M, Finger M, Finger M Jr, Assran Y, Ellithi Kamel A, Mahmoud MA, Radi A, Kadastik M, Murumaa M, Raidal M, Tiko A, Eerola P, Fedi G, Voutilainen M, Härkönen J, Karimäki V, Kinnunen R, Kortelainen MJ, Lampén T, Lassila-Perini K, Lehti S, Lindén T, Luukka P, Mäenpää T, Peltola T, Tuominen E, Tuominiemi J, Tuovinen E, Wendland L, Talvitie J, Tuuva T, Besancon M, Couderc F, Dejardin M, Denegri D, Fabbro B, Faure JL, Favaro C, Ferri F, Ganjour S, Givernaud A, Gras P, Hamel de Monchenault G, Jarry P, Locci E, Malcles J, Rander J, Rosowsky A, Titov M, Baffioni S, Beaudette F, Busson P, Charlot C, Dahms T, Dalchenko M, Dobrzynski L, Filipovic N, Florent A, Granier de Cassagnac R, Mastrolorenzo L, Miné P, Mironov C, Naranjo IN, Nguyen M, Ochando C, Ortona G, Paganini P, Regnard S, Salerno R, Sauvan JB, Sirois Y, Veelken C, Yilmaz Y, Zabi A, Agram JL, Andrea J, Aubin A, Bloch D, Brom JM, Chabert EC, Collard C, Conte E, Fontaine JC, Gelé D, Goerlach U, Goetzmann C, Le Bihan AC, Skovpen K, Van Hove P, Gadrat S, Beauceron S, Beaupere N, Boudoul G, Bouvier E, Brochet S, Carrillo Montoya CA, Chasserat J, Chierici R, Contardo D, Depasse P, El Mamouni H, Fan J, Fay J, Gascon S, Gouzevitch M, Ille B, Kurca T, Lethuillier M, Mirabito L, Perries S, Ruiz Alvarez JD, Sabes D, Sgandurra L, Sordini V, Vander Donckt M, Verdier P, Viret S, Xiao H, Tsamalaidze Z, Autermann C, Beranek S, Bontenackels M, Edelhoff M, Feld L, Heister A, Hindrichs O, Klein K, Ostapchuk A, Raupach F, Sammet J, Schael S, Schulte JF, Weber H, Wittmer B, Zhukov V, Ata M, Brodski M, Dietz-Laursonn E, Duchardt D, Erdmann M, Fischer R, Güth A, Hebbeker T, Heidemann C, Hoepfner K, Klingebiel D, Knutzen S, Kreuzer P, Merschmeyer M, Meyer A, Millet P, Olschewski M, Padeken K, Papacz P, Reithler H, Schmitz SA, Sonnenschein L, Teyssier D, Thüer S, Weber M, Cherepanov V, Erdogan Y, Flügge G, Geenen H, Geisler M, Haj Ahmad W, Hoehle F, Kargoll B, Kress T, Kuessel Y, Künsken A, Lingemann J, Nowack A, Nugent IM, Pooth O, Stahl A, Aldaya Martin M, Asin I, Bartosik N, Behr J, Behrens U, Bell AJ, Bethani A, Borras K, Burgmeier A, Cakir A, Calligaris L, Campbell A, Choudhury S, Costanza F, Diez Pardos C, Dolinska G, Dooling S, Dorland T, Eckerlin G, Eckstein D, Eichhorn T, Flucke G, Garay Garcia J, Geiser A, Gunnellini P, Hauk J, Hempel M, Jung H, Kalogeropoulos A, Kasemann M, Katsas P, Kieseler J, Kleinwort C, Korol I, Krücker D, Lange W, Leonard J, Lipka K, Lobanov A, Lohmann W, Lutz B, Mankel R, Marfin I, Melzer-Pellmann IA, Meyer AB, Mittag G, Mnich J, Mussgiller A, Naumann-Emme S, Nayak A, Ntomari E, Perrey H, Pitzl D, Placakyte R, Raspereza A, Ribeiro Cipriano PM, Roland B, Ron E, Sahin MÖ, Salfeld-Nebgen J, Saxena P, Schoerner-Sadenius T, Schröder M, Seitz C, Spannagel S, Vargas Trevino AD, Walsh R, Wissing C, Blobel V, Centis Vignali M, Draeger AR, Erfle J, Garutti E, Goebel K, Görner M, Haller J, Hoffmann M, Höing RS, Junkes A, Kirschenmann H, Klanner R, Kogler R, Lange J, Lapsien T, Lenz T, Marchesini I, Ott J, Peiffer T, Perieanu A, Pietsch N, Poehlsen J, Poehlsen T, Rathjens D, Sander C, Schettler H, Schleper P, Schlieckau E, Schmidt A, Seidel M, Sola V, Stadie H, Steinbrück G, Troendle D, Usai E, Vanelderen L, Vanhoefer A, Barth C, Baus C, Berger J, Böser C, Butz E, Chwalek T, De Boer W, Descroix A, Dierlamm A, Feindt M, Frensch F, Giffels M, Gilbert A, Hartmann F, Hauth T, Husemann U, Katkov I, Kornmayer A, Kuznetsova E, Lobelle Pardo P, Mozer MU, Müller T, Müller T, Nürnberg A, Quast G, Rabbertz K, Röcker S, Simonis HJ, Stober FM, Ulrich R, Wagner-Kuhr J, Wayand S, Weiler T, Wolf R, Anagnostou G, Daskalakis G, Geralis T, Giakoumopoulou VA, Kyriakis A, Loukas D, Markou A, Markou C, Psallidas A, Topsis-Giotis I, Agapitos A, Kesisoglou S, Panagiotou A, Saoulidou N, Stiliaris E, Aslanoglou X, Evangelou I, Flouris G, Foudas C, Kokkas P, Manthos N, Papadopoulos I, Paradas E, Strologas J, Bencze G, Hajdu C, Hidas P, Horvath D, Sikler F, Veszpremi V, Vesztergombi G, Zsigmond AJ, Beni N, Czellar S, Karancsi J, Molnar J, Palinkas J, Szillasi Z, Makovec A, Raics P, Trocsanyi ZL, Ujvari B, Sahoo N, Swain SK, Beri SB, Bhatnagar V, Gupta R, Bhawandeep U, Kalsi AK, Kaur M, Kumar R, Mittal M, Nishu N, Singh JB, Kumar A, Kumar A, Ahuja S, Bhardwaj A, Choudhary BC, Kumar A, Malhotra S, Naimuddin M, Ranjan K, Sharma V, Banerjee S, Bhattacharya S, Chatterjee K, Dutta S, Gomber B, Jain S, Jain Sh, Khurana R, Modak A, Mukherjee S, Roy D, Sarkar S, Sharan M, Abdulsalam A, Dutta D, Kailas S, Kumar V, Mohanty AK, Pant LM, Shukla P, Topkar A, Aziz T, Banerjee S, Bhowmik S, Chatterjee RM, Dewanjee RK, Dugad S, Ganguly S, Ghosh S, Guchait M, Gurtu A, Kole G, Kumar S, Maity M, Majumder G, Mazumdar K, Mohanty GB, Parida B, Sudhakar K, Wickramage N, Bakhshiansohi H, Behnamian H, Etesami SM, Fahim A, Goldouzian R, Khakzad M, Mohammadi Najafabadi M, Naseri M, Paktinat Mehdiabadi S, Rezaei Hosseinabadi F, Safarzadeh B, Zeinali M, Felcini M, Grunewald M, Abbrescia M, Calabria C, Chhibra SS, Colaleo A, Creanza D, De Filippis N, De Palma M, Fiore L, Iaselli G, Maggi G, Maggi M, My S, Nuzzo S, Pompili A, Pugliese G, Radogna R, Selvaggi G, Sharma A, Silvestris L, Venditti R, Verwilligen P, Abbiendi G, Benvenuti AC, Bonacorsi D, Braibant-Giacomelli S, Brigliadori L, Campanini R, Capiluppi P, Castro A, Cavallo FR, Codispoti G, Cuffiani M, Dallavalle GM, Fabbri F, Fanfani A, Fasanella D, Giacomelli P, Grandi C, Guiducci L, Marcellini S, Masetti G, Montanari A, Navarria FL, Perrotta A, Primavera F, Rossi AM, Rovelli T, Siroli GP, Tosi N, Travaglini R, Albergo S, Cappello G, Chiorboli M, Costa S, Giordano F, Potenza R, Tricomi A, Tuve C, Barbagli G, Ciulli V, Civinini C, D'Alessandro R, Focardi E, Gallo E, Gonzi S, Gori V, Lenzi P, Meschini M, Paoletti S, Sguazzoni G, Tropiano A, Benussi L, Bianco S, Fabbri F, Piccolo D, Ferretti R, Ferro F, Lo Vetere M, Robutti E, Tosi S, Dinardo ME, Fiorendi S, Gennai S, Gerosa R, Ghezzi A, Govoni P, Lucchini MT, Malvezzi S, Manzoni RA, Martelli A, Marzocchi B, Menasce D, Moroni L, Paganoni M, Pedrini D, Ragazzi S, Redaelli N, Tabarelli de Fatis T, Buontempo S, Cavallo N, Di Guida S, Fabozzi F, Iorio AO, Lista L, Meola S, Merola M, Paolucci P, Azzi P, Bacchetta N, Bisello D, Branca A, Carlin R, Checchia P, Dall'Osso M, Dorigo T, Dosselli U, Galanti M, Gasparini F, Gasparini U, Giubilato P, Gozzelino A, Kanishchev K, Lacaprara, Margoni M, Meneguzzo, Pazzini J, Pozzobon N, Ronchese P, Simonetto F, Torassa E, Tosi M, Zotto P, Zucchetta A, Zumerle G, Gabusi M, Ratti SP, Re V, Riccardi C, Salvini P, Vitulo P, Biasini M, Bilei GM, Ciangottini D, Fanò P, Lariccia P, Mantovani G, Menichelli M, Saha A, Santocchia A, Spiezia A, Androsov K, Azzurri P, Bagliesi G, Bernardini J, Boccali T, Broccolo G, Castaldi R, Ciocci MA, Dell'Orso, Donato S, Fiori F, Foà L, Giassi A, Grippo MT, Ligabue F, Lomtadze T, Martini L, Messineo A, Moon CS, Palla F, Rizzi A, Savoy-Navarro A, Serban AT, Spagnolo P, Squillacioti P, Tenchini R, Tonelli G, Venturi A, Verdini PG, Vernieri C, Barone L, Cavallari F, D'imperio G, Del Re R, Diemoz M, Jorda C, Longo E, Margaroli F, Meridiani P, Micheli F, Nourbakhsh S, Organtini G, Paramatti R, Rahatlou S, Rovelli C, Santanastasio F, Soffi L, Traczyk P, Amapane N, Arcidiacono R, Argiro S, Arneodo M, Bellan R, Biino C, Cartiglia N, Casasso S, Costa M, Degano A, Demaria N, Finco L, Mariotti C, Maselli S, Migliore E, Monaco V, Musich M, Obertino MM, Pacher L, Pastrone N, Pelliccioni M, Pinna Angioni GL, Potenza A, Romero A, Ruspa M, Sacchi R, Solano A, Staiano A, Tamponi U, Belforte S, Candelise V, Casarsa M, Cossutti F, Della Ricca G, Gobbo B, La Licata C, Marone M, Schizzi A, Umer T, Zanetti A, Chang S, Kropivnitskaya A, Nam SK, Kim DH, Kim GN, Kim MS, Kong DJ, Lee S, Oh YD, Park H, Sakharov A, Son DC, Kim TJ, Kim JY, Song S, Choi S, Gyun D, Hong B, Jo M, Kim H, Kim Y, Lee B, Lee KS, Park SK, Roh Y, Yoo HD, Choi M, Kim JH, Park IC, Ryu G, Ryu MS, Choi Y, Choi YK, Goh J, Kim D, Kwon E, Lee J, Yu I, Juodagalvis A, Komaragiri JR, Md Ali MA, Casimiro Linares E, Castilla-Valdez H, De La Cruz-Burelo E, Heredia-de La Cruz I, Hernandez-Almada A, Lopez-Fernandez R, Sanchez-Hernandez A, Carrillo Moreno S, Vazquez Valencia F, Pedraza I, Salazar Ibarguen HA, Morelos Pineda A, Krofcheck D, Butler PH, Reucroft S, Ahmad A, Ahmad M, Hassan Q, Hoorani HR, Khan WA, Khurshid T, Shoaib M, Bialkowska H, Bluj M, Boimska B, Frueboes T, Górski M, Kazana M, Nawrocki K, Romanowska-Rybinska K, Szleper M, Zalewski P, Brona G, Bunkowski K, Cwiok M, Dominik W, Doroba K, Kalinowski A, Konecki M, Krolikowski J, Misiura M, Olszewski M, Wolszczak W, Bargassa P, Beirão Da Cruz E Silva C, Faccioli P, Ferreira Parracho PG, Gallinaro M, Lloret Iglesias L, Nguyen F, Rodrigues Antunes J, Seixas J, Varela J, Vischia P, Afanasiev S, Bunin P, Gavrilenko M, Golutvin I, Gorbunov I, Kamenev A, Karjavin V, Konoplyanikov V, Lanev A, Malakhov A, Matveev V, Moisenz P, Palichik V, Perelygin V, Shmatov S, Skatchkov N, Smirnov V, Zarubin A, Golovtsov V, Ivanov Y, Kim V, Levchenko P, Murzin V, Oreshkin V, Smirnov I, Sulimov V, Uvarov L, Vavilov S, Vorobyev A, Vorobyev A, Andreev Y, Dermenev A, Gninenko S, Golubev N, Kirsanov M, Krasnikov N, Pashenkov A, Tlisov D, Toropin A, Epshteyn V, Gavrilov V, Lychkovskaya N, Popov V, Pozdnyakov I, Safronov G, Semenov S, Spiridonov A, Stolin V, Vlasov E, Zhokin A, Andreev V, Azarkin M, Dremin I, Kirakosyan M, Leonidov A, Mesyats G, Rusakov SV, Vinogradov A, Belyaev A, Boos E, Dubinin M, Dudko L, Ershov A, Gribushin A, Klyukhin V, Kodolova O, Lokhtin I, Obraztsov S, Petrushanko S, Savrin V, Snigirev A, Azhgirey I, Bayshev I, Bitioukov S, Kachanov V, Kalinin A, Konstantinov D, Krychkine V, Petrov V, Ryutin R, Sobol A, Tourtchanovitch L, Troshin S, Tyurin N, Uzunian A, Volkov A, Adzic P, Ekmedzic M, Milosevic J, Rekovic V, Alcaraz Maestre J, Battilana C, Calvo E, Cerrada M, Chamizo Llatas M, Colino N, De La Cruz B, Delgado Peris A, Domínguez Vázquez D, Escalante Del Valle A, Fernandez Bedoya C, Fernández Ramos JP, Flix J, Fouz MC, Garcia-Abia P, Gonzalez Lopez O, Goy Lopez S, Hernandez JM, Josa MI, Navarro De Martino E, Pérez-Calero Yzquierdo A, Puerta Pelayo J, Quintario Olmeda A, Redondo I, Romero L, Soares MS, Albajar C, de Trocóniz JF, Missiroli M, Moran D, Brun H, Cuevas J, Fernandez Menendez J, 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Abstract

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 B0 meson decaying into two oppositely charged muons (μ+ and μ−) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B(s)(0) →µ+µ− and B(0) →µ+µ− decays are very rare, with about four of the former occurring for every billion mesons produced, and one of the latter occurring for every ten billion B0 mesons. 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 CERN 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) → µ+µ− 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) → µ+µ− 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 B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.

PMID:
26047778
DOI:
10.1038/nature14474
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