Observation of the DecayB−→Ds(*)+K−ℓ−ν¯ℓ

P Del Amo Sanchez,M Gaspero,C M Hawkes,E Salvati,A V Telnov,K R Schubert,M Schram,A Seiden,A M Lutz,F Le Diberder,K Suzuki,A E Rubin,A Volk,M A Saeed,H W Wulsin,L Vitale,G R Bonneaud,J L Ritchie,V Poireau,A Stocchi,A T Watson,G Vasseur,E Prencipe,M R Convery,S Luitz,A Oyanguren,R Kroeger,M Munerato,W Dunwoodie,A M Rahimi,A A Salnikov,M Bellis,P Taras,D J Summers,U Uwer,C Hast,J Serrano,C J Schilling,M Battaglia,M S Alam,A Snyder,L A Corwin,E Ben-Haim,N L Blount,R Schwierz,G Lynch,V Ziegler,S L Wu,B Pan,D Bettoni,W T Ford,S Nelson,D Gamba,C Touramanis,R Contri,J W Gary,G Finocchiaro,C A Chavez,K J Knoepfel,M Bondioli,P M Patel,M Verderi,S Passaggio,A Palano,G Grosdidier,P Ongmongkolkul,B Stugu,F Ferrarotto,M Weaver,B G Fulsom,M H Kelsey,E M T Puccio,A N Yushkov,A Cecchi,P Biassoni,M Franco Sevilla,G Raven,N Guttman,J Va’Vra,W R Innes,R J Barlow,S J Sekula,S Sitt,P C Bloom,I M Nugent,N Gagliardi,M Fritsch,W Park,M K Sullivan,C Cartaro,M Nicolaci,F Simonetto,S Playfer,P Lund,M A Mazzoni,G Calderini,G Piredda,J Albert,J M Tuggle,A Hafner,W J Wisniewski,F Anulli,G J King,M Andreotti,D J Asgeirsson,S Prell,M Pappagallo,P R Burchat,H R Band,D Su,V E Blinov,E P Solodov,A Zallo,X R Chen,R F Schwitters,A Lazzaro,M Lo Vetere,V Santoro,M Rotondo,J Garra Tico,T M Karbach,C Hearty,G Eigen,S Schenk,J Schwiening,A R Buzykaev,M Mandelkern,R Rahmat,G Onorato,S I Serednyakov,G P Dubois-Felsmann,A Adametz,H Briand,M Ebert,J M Losecco,B N Ratcliff,H M Lacker,N B Sinev,E Fioravanti,D Lindemann,H L Snoek,S Ahmed,G De Nardo,H Schröder,M Morii,F Di Lodovico,A K Yarritu,Z J Guo,R Stroili,B C Wray,S Stracka,B Echenard,F Ferroni,E Torrence,D G Hitlin,M Piccolo,J Chauveau,S Pacetti,W S Lockman,R Eckmann,H Marsiske,J Merkel,L Li Gioi,I M Peruzzi,L Sun,T Pulliam,A J Lankford,G Casarosa,A Lusiani,L Lanceri,M Rama,T Leddig,A C Wren,M Davier,O Hamon,G Cibinetto,J P Lees,J R Fry,K Wacker,P H Fisher,H Atmacan,R Baldini-Ferroli,S B Zain,G Cavoto,R Frey,E Paoloni,I Bingham,R De Sangro,E Baracchini,B Franek,S Bettarini,X Nguyen,F C Porter,R Calabrese,C Patrignani,A M Ruland,J Marks,T Schalk,D A Roberts,C Dallapiccola,K Honscheid,W Gradl,A Petrella,M Posocco,J Prendki,A Y Rakitin,J G Smith,I Ofte,V Prasad,K T Flood,R Faccini,A Petzold,E C Martin,A Calcaterra,G M Vitug,H Jasper,T S Miyashita,P Franchini,J M Roney,D P Stoker,D J Bard,M D Sokoloff,V Tisserand,B Bhuyan,J Ocariz,S Emery,J Kroseberg,R Gamet,G Mancinelli,P Sonnek,N Arnaud,T S Mattison,J A Mckenna,J P Coleman,J Dorfan,P Roudeau,A Jawahery,R Cenci,E Gabathuler,U Nauenberg,R Sacco,R Bartoldus,C H Cheng,R Kowalewski,T Lueck,G Marchiori,B Spaan,F Bianchi,J Anderson,W T Meyer,G Castelli,F F Wilson,T M Hong,H L Lynch,M J Lewczuk,D B Macfarlane,M H Schune,R Godang,D Lopes Pegna,D J Payne,H H F Choi,C Bozzi,M Wittgen,D Aston,M Zito,T J West,F Forti,U Mallik,M Carpinelli,C L Davis,S Curry,G Rizzo,L Piemontese,E I Rosenberg,P J Clark,A M Gabareen,W H Toki,A M Eisner,F Palombo,M Simard,F Renga,R Cowan,G Batignani,G Wormser,D W G S Leith,E Feltresi,G D Lafferty,L T Kerth,S H Robertson,T Hartmann,A P Onuchin,F Liu,R Prepost,D Kirkby,R Ayad,C C Young,R Andreassen,H B Crawley,D Monorchio,Yu G Kolomensky,D A Doll,M V Purohit,K E Alwyn,M T Allen,A Roodman,M Kobel ,M G Zhao ,B Lindquist ,J Firmino Da Costa ,M R Monge ,G Hamel De Monchenault ,S Tosi ,N López-March ,Dong Liu ,A Denig ,E Guido ,G Jackson ,C P O’grady ,A Rossi ,M Nagel ,A V Gritsan ,D Kovalskyi ,C West ,K Yu Todyshev ,C Chen ,J F Benitez ,A Cervelli ,Yu I Skovpen ,C Sciacca ,R.h Schindler ,C Campagnari ,E Manoni ,E Robutti ,M Negrini ,C Vuosalo ,X Lou ,J Strube ,P K Behera ,P Grenier ,S S Sun ,S Banerjee ,V Lombardo ,D Wright ,P Dauncey ,C Angelini ,Y Pan ,R Waldi ,O Long ,R Kass ,M A Giorgi ,T Gershon ,A Pérez ,S Paramesvaran ,M J Tibbetts ,J E Brau ,P Kim ,M Kocian ,J E Watson ,I Osipenkov ,B Hooberman ,J Cochran ,Ch Yèche ,S R Wagner ,D Dujmić ,G Cowan ,M Martinelli ,E Luppi ,E Olaiya ,H A Neal ,M Bomben ,D R Müller ,H Kim ,C Lü ,H Koch ,D Hutchcroft ,J R Wilson ,D Lange ,J Kolb ,W F Wang ,A Gaz ,M Perl ,M Biasini ,M Dubrovin ,J Walsh ,Ph Leruste ,A J Martínez ,D Strom ,L Cremaldi ,M Pelliccioni ,K Hamano ,B Meadows ,A Soffer ,D Bailey ,D Bernard ,M T Graham ,J M Izen ,C.a Heusch ,P Patterí ,A J S Smith ,J Richman ,L Winstrom ,V Sordini ,D H Wright ,J P Morris ,В П Дружинин ,A J Bevan ,S Dasu ,C P Jessop ,R Sobie ,T Adye ,V Lüth ,B Malaescu ,L Wang ,D Moran ,A P Wagner ,F Martínez-Vidal ,O Igonkina ,G Sciolla ,В Б Голубев ,A Khan ,P F Harrison ,B A Schumm ,C L Lee ,M Margoni ,E Graugés ,D N Brown ,J M Thompson ,N Neri ,T Latham ,A Randle-Conde ,Д Деркач ,Y Y Gao ,S Spanier ,T Vazquez Schroeder ,S Li ,F U Bernlochner ,G Simi ,J Olsen ,R M White ,J Ernst ,T Tanabe ,M Sigamani ,R C Field ,D A Milanés ,A J Edwards

doi:10.1103/physrevlett.107.041804

Abstract

We report the observation of the decay B- → D(s)((*)+) K- ℓ- ν(ℓ) based on 342 fb(-1) of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+ e- storage rings at SLAC. A simultaneous fit to three D(s)(+) decay chains is performed to extract the signal yield from measurements of the squared missing mass in the B meson decay. We observe the decay B- → D(s)((*)+) K- ℓ- ν(ℓ) with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B- → D(s)((*)+) K- ℓ- ν(ℓ)) = [6.13(-1.03)(+1.04)(stat)±0.43(syst)±0.51(B(D(s)))]×10(-4), where the last error reflects the limited knowledge of the D(s) branching fractions.

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