First observation of the decay B + → π + μ + μ −

Author:

,Aaij R.,Beteta C. Abellan,Adametz A.,Adeva B.,Adinolfi M.,Adrover C.,Affolder A.,Ajaltouni Z.,Albrecht J.,Alessio F.,Alexander M.,Ali S.,Alkhazov G.,Cartelle P. Alvarez,Alves A. A.,Amato S.,Amhis Y.,Anderlini L.,Anderson J.,Appleby R. B.,Gutierrez O. Aquines,Archilli F.,Artamonov A.,Artuso M.,Aslanides E.,Auriemma G.,Bachmann S.,Back J. J.,Baesso C.,Balagura V.,Baldini W.,Barlow R. J.,Barschel C.,Barsuk S.,Barter W.,Bates A.,Bauer C.,Bauer Th.,Bay A.,Beddow J.,Bediaga I.,Belogurov S.,Belous K.,Belyaev I.,Ben-Haim E.,Benayoun M.,Bencivenni G.,Benson S.,Benton J.,Berezhnoy A.,Bernet R.,Bettler M.-O.,van Beuzekom M.,Bien A.,Bifani S.,Bird T.,Bizzeti A.,Bjørnstad P. M.,Blake T.,Blanc F.,Blanks C.,Blouw J.,Blusk S.,Bobrov A.,Bocci V.,Bondar A.,Bondar N.,Bonivento W.,Borghi S.,Borgia A.,Bowcock T. J. V.,Bozzi C.,Brambach T.,van den Brand J.,Bressieux J.,Brett D.,Britsch M.,Britton T.,Brook N. H.,Brown H.,Büchler-Germann A.,Burducea I.,Bursche A.,Buytaert J.,Cadeddu S.,Callot O.,Calvi M.,Gomez M. Calvo,Camboni A.,Campana P.,Carbone A.,Carboni G.,Cardinale R.,Cardini A.,Carson L.,Akiba K. Carvalho,Casse G.,Cattaneo M.,Cauet Ch.,Charles M.,Charpentier Ph.,Chen P.,Chiapolini N.,Chrzaszcz M.,Ciba K.,Vidal X. Cid,Ciezarek G.,Clarke P. E. L.,Clemencic M.,Cliff H. V.,Closier J.,Coca C.,Coco V.,Cogan J.,Cogneras E.,Collins P.,Comerma-Montells A.,Contu A.,Cook A.,Coombes M.,Corti G.,Couturier B.,Cowan G. A.,Craik D.,Cunliffe S.,Currie R.,D’Ambrosio C.,David P.,David P. N. Y.,De Bonis I.,De Bruyn K.,De Capua S.,De Cian M.,De Miranda J. M.,De Paula L.,De Simone P.,Decamp D.,Deckenhoff M.,Degaudenzi H.,Del Buono L.,Deplano C.,Derkach D.,Deschamps O.,Dettori F.,Dickens J.,Dijkstra H.,Batista P. Diniz,Bonal F. Domingo,Donleavy S.,Dordei F.,Suárez A. Dosil,Dossett D.,Dovbnya A.,Dupertuis F.,Dzhelyadin R.,Dziurda A.,Dzyuba A.,Easo S.,Egede U.,Egorychev V.,Eidelman S.,van Eijk D.,Eisele F.,Eisenhardt S.,Ekelhof R.,Eklund L.,El Rifai I.,Elsasser Ch.,Elsby D.,Pereira D. Esperante,Falabella A.,Färber C.,Fardell G.,Farinelli C.,Farry S.,Fave V.,Albor V. Fernandez,Rodrigues F. Ferreira,Ferro-Luzzi M.,Filippov S.,Fitzpatrick C.,Fontana M.,Fontanelli F.,Forty R.,Francisco O.,Frank M.,Frei C.,Frosini M.,Furcas S.,Torreira A. Gallas,Galli D.,Gandelman M.,Gandini P.,Gao Y.,Garnier J.-C.,Garofoli J.,Tico J. Garra,Garrido L.,Gascon D.,Gaspar C.,Gauld R.,Gersabeck E.,Gersabeck M.,Gershon T.,Ghez Ph.,Gibson V.,Gligorov V. V.,Göbel C.,Golubkov D.,Golutvin A.,Gomes A.,Gordon H.,Gándara M. Grabalosa,Diaz R. Graciani,Cardoso L. A. Granado,Graugés E.,Graziani G.,Grecu A.,Greening E.,Gregson S.,Grünberg O.,Gui B.,Gushchin E.,Guz Yu.,Gys T.,Hadjivasiliou C.,Haefeli G.,Haen C.,Haines S. C.,Hall S.,Hampson T.,Hansmann-Menzemer S.,Harnew N.,Harnew S. T.,Harrison J.,Harrison P. F.,Hartmann T.,He J.,Heijne V.,Hennessy K.,Henrard P.,Morata J. A. Hernando,van Herwijnen E.,Hicks E.,Hill D.,Hoballah M.,Hopchev P.,Hulsbergen W.,Hunt P.,Huse T.,Hussain N.,Huston R. S.,Hutchcroft D.,Hynds D.,Iakovenko V.,Ilten P.,Imong J.,Jacobsson R.,Jaeger A.,Hussein M. Jahjah,Jans E.,Jansen F.,Jaton P.,Jean-Marie B.,Jing F.,John M.,Johnson D.,Jones C. R.,Jost B.,Kaballo M.,Kandybei S.,Karacson M.,Karbach T. M.,Keaveney J.,Kenyon I. R.,Kerzel U.,Ketel T.,Keune A.,Khanji B.,Kim Y. M.,Knecht M.,Kochebina O.,Komarov I.,Koopman R. F.,Koppenburg P.,Korolev M.,Kozlinskiy A.,Kravchuk L.,Kreplin K.,Kreps M.,Krocker G.,Krokovny P.,Kruse F.,Kucharczyk M.,Kudryavtsev V.,Kvaratskheliya T.,La Thi V. N.,Lacarrere D.,Lafferty G.,Lai A.,Lambert D.,Lambert R. W.,Lanciotti E.,Lanfranchi G.,Langenbruch C.,Latham T.,Lazzeroni C.,Le Gac R.,van Leerdam J.,Lees J.-P.,Lefèvre R.,Leflat A.,Lefrançois J.,Leroy O.,Lesiak T.,Li L.,Li Y.,Gioi L. Li,Lieng M.,Liles M.,Lindner R.,Linn C.,Liu B.,Liu G.,von Loeben J.,Lopes J. H.,Asamar E. Lopez,Lopez-March N.,Lu H.,Luisier J.,Raighne A. Mac,Machefert F.,Machikhiliyan I. V.,Maciuc F.,Maev O.,Magnin J.,Malde S.,Mamunur R. M. D.,Manca G.,Mancinelli G.,Mangiafave N.,Marconi U.,Märki R.,Marks J.,Martellotti G.,Martens A.,Martin L.,Sánchez A. Martín,Martinelli M.,Santos D. Martinez,Massafferri A.,Mathe Z.,Matteuzzi C.,Matveev M.,Maurice E.,Mazurov A.,McCarthy J.,McGregor G.,McNulty R.,Meissner M.,Merk M.,Merkel J.,Milanes D. A.,Minard M.-N.,Rodriguez J. Molina,Monteil S.,Moran D.,Morawski P.,Mountain R.,Mous I.,Muheim F.,Müller K.,Muresan R.,Muryn B.,Muster B.,Mylroie-Smith J.,Naik P.,Nakada T.,Nandakumar R.,Nasteva I.,Needham M.,Neufeld N.,Nguyen A. D.,Nguyen-Mau C.,Nicol M.,Niess V.,Nikitin N.,Nikodem T.,Nomerotski A.,Novoselov A.,Oblakowska-Mucha A.,Obraztsov V.,Oggero S.,Ogilvy S.,Okhrimenko O.,Oldeman R.,Orlandea M.,Goicochea J. M. Otalora,Owen P.,Pal B. K.,Palano A.,Palutan M.,Panman J.,Papanestis A.,Pappagallo M.,Parkes C.,Parkinson C. J.,Passaleva G.,Patel G. D.,Patel M.,Patrick G. N.,Patrignani C.,Pavel-Nicorescu C.,Alvarez A. Pazos,Pellegrino A.,Penso G.,Altarelli M. Pepe,Perazzini S.,Perego D. L.,Trigo E. Perez,Yzquierdo A. Pérez-Calero,Perret P.,Perrin-Terrin M.,Pessina G.,Petrolini A.,Phan A.,Olloqui E. Picatoste,Valls B. Pie,Pietrzyk B.,Pilař T.,Pinci D.,Playfer S.,Casasus M. Plo,Polci F.,Polok G.,Poluektov A.,Polycarpo E.,Popov D.,Popovici B.,Potterat C.,Powell A.,Prisciandaro J.,Pugatch V.,Navarro A. Puig,Qian W.,Rademacker J. H.,Rakotomiaramanana B.,Rangel M. S.,Raniuk I.,Rauschmayr N.,Raven G.,Redford S.,Reid M. M.,dos Reis A. C.,Ricciardi S.,Richards A.,Rinnert K.,Romero D. A. Roa,Robbe P.,Rodrigues E.,Perez P. Rodriguez,Rogers G. J.,Roiser S.,Romanovsky V.,Vidal A. Romero,Rosello M.,Rouvinet J.,Ruf T.,Ruiz H.,Sabatino G.,Silva J. J. Saborido,Sagidova N.,Sail P.,Saitta B.,Salzmann C.,Sedes B. Sanmartin,Sannino M.,Santacesaria R.,Rios C. Santamarina,Santinelli R.,Santovetti E.,Sapunov M.,Sarti A.,Satriano C.,Satta A.,Savrie M.,Savrina D.,Schaack P.,Schiller M.,Schindler H.,Schleich S.,Schlupp M.,Schmelling M.,Schmidt B.,Schneider O.,Schopper A.,Schune M.-H.,Schwemmer R.,Sciascia B.,Sciubba A.,Seco M.,Semennikov A.,Senderowska K.,Sepp I.,Serra N.,Serrano J.,Seyfert P.,Shapkin M.,Shapoval I.,Shatalov P.,Shcheglov Y.,Shears T.,Shekhtman L.,Shevchenko O.,Shevchenko V.,Shires A.,Coutinho R. Silva,Skwarnicki T.,Smith N. A.,Smith E.,Smith M.,Sobczak K.,Soler F. J. P.,Solomin A.,Soomro F.,Souza D.,De Paula B. Souza,Spaan B.,Sparkes A.,Spradlin P.,Stagni F.,Stahl S.,Steinkamp O.,Stoica S.,Stone S.,Storaci B.,Straticiuc M.,Straumann U.,Subbiah V. K.,Swientek S.,Szczekowski M.,Szczypka P.,Szumlak T.,T’Jampens S.,Teklishyn M.,Teodorescu E.,Teubert F.,Thomas C.,Thomas E.,van Tilburg J.,Tisserand V.,Tobin M.,Tolk S.,Topp-Joergensen S.,Torr N.,Tournefier E.,Tourneur S.,Tran M. T.,Tsaregorodtsev A.,Tuning N.,Garcia M. Ubeda,Ukleja A.,Uwer U.,Vagnoni V.,Valenti G.,Gomez R. Vazquez,Regueiro P. Vazquez,Vecchi S.,Velthuis J. J.,Veltri M.,Veneziano G.,Vesterinen M.,Viaud B.,Videau I.,Vieira D.,Vilasis-Cardona X.,Visniakov J.,Vollhardt A.,Volyanskyy D.,Voong D.,Vorobyev A.,Vorobyev V.,Voß C.,Voss H.,Waldi R.,Wallace R.,Wandernoth S.,Wang J.,Ward D. R.,Watson N. K.,Webber A. D.,Websdale D.,Whitehead M.,Wicht J.,Wiedner D.,Wiggers L.,Wilkinson G.,Williams M. P.,Williams M.,Wilson F. F.,Wishahi J.,Witek M.,Witzeling W.,Wotton S. A.,Wright S.,Wu S.,Wyllie K.,Xie Y.,Xing F.,Xing Z.,Yang Z.,Young R.,Yuan X.,Yushchenko O.,Zangoli M.,Zavertyaev M.,Zhang F.,Zhang L.,Zhang W. C.,Zhang Y.,Zhelezov A.,Zhong L.,Zvyagin A.

Abstract

Abstract A discovery of the rare decay B +π + μ + μ is presented. This decay is observed for the first time, with 5.2 σ significance. The observation is made using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected with the LHCb detector. The measured branching fraction is (2.3 ± 0.6 (stat.) ± 0.1 (syst.))×10−8, and the ratio of the B +π + μ + μ and B +K + μ + μ branching fractions is measured to be 0.053 ± 0.014 (stat.) ± 0.001 (syst.).

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Reference34 articles.

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