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Phys Rev Lett. 2011 Jul 22;107(4):041804. Epub 2011 Jul 22.

Observation of the decay B- → D(s)((*)+) K- ℓ- ν(ℓ).

Sanchez Pdel A, Lees JP, Poireau V, Prencipe E, Tisserand V, Garra Tico J, Grauges E, Martinelli M, Palano A, Pappagallo M, Eigen G, Stugu B, Sun L, Battaglia M, Brown DN, Hooberman B, Kerth LT, Kolomensky YG, Lynch G, Osipenkov IL, Tanabe T, Hawkes CM, Watson AT, Koch H, Schroeder T, Asgeirsson DJ, Hearty C, Mattison TS, McKenna JA, Khan A, Randle-Conde A, Blinov VE, Buzykaev AR, Druzhinin VP, Golubev VB, Onuchin AP, Serednyakov SI, Skovpen YI, Solodov EP, Todyshev KY, Yushkov AN, Bondioli M, Curry S, Kirkby D, Lankford AJ, Mandelkern M, Martin EC, Stoker DP, Atmacan H, Gary JW, Liu F, Long O, Vitug GM, Campagnari C, Hong TM, Kovalskyi D, Richman JD, Eisner AM, Heusch CA, Kroseberg J, Lockman WS, Martinez AJ, Schalk T, Schumm BA, Seiden A, Winstrom LO, Cheng CH, Doll DA, Echenard B, Hitlin DG, Ongmongkolkul P, Porter FC, Rakitin AY, Andreassen R, Dubrovin MS, Mancinelli G, Meadows BT, Sokoloff MD, Bloom PC, Ford WT, Gaz A, Nagel M, Nauenberg U, Smith JG, Wagner SR, Ayad R, Toki WH, Jasper H, Karbach TM, Merkel J, Petzold A, Spaan B, Wacker K, Kobel MJ, Schubert KR, Schwierz R, Bernard D, Verderi M, Clark PJ, Playfer S, Watson JE, Andreotti M, Bettoni D, Bozzi C, Calabrese R, Cecchi A, Cibinetto G, Fioravanti E, Franchini P, Luppi E, Munerato M, Negrini M, Petrella A, Piemontese L, Baldini-Ferroli R, Calcaterra A, de Sangro R, Finocchiaro G, Nicolaci M, Pacetti S, Patteri P, Peruzzi IM, Piccolo M, Rama M, Zallo A, Contri R, Guido E, Lo Vetere M, Monge MR, Passaggio S, Patrignani C, Robutti E, Tosi S, Bhuyan B, Prasad V, Lee CL, Morii M, Adametz A, Marks J, Schenk S, Uwer U, Bernlochner FU, Ebert M, Lacker HM, Lueck T, Volk A, Dauncey PD, Tibbetts M, Behera PK, Mallik U, Chen C, Cochran J, Crawley HB, Dong L, Meyer WT, Prell S, Rosenberg EI, Rubin AE, Gao YY, Gritsan AV, Guo ZJ, Arnaud N, Davier M, Derkach D, da Costa JF, Grosdidier G, Le Diberder F, Lutz AM, Malaescu B, Perez A, Roudeau P, Schune MH, Serrano J, Sordini V, Stocchi A, Wang L, Wormser G, Lange DJ, Wright DM, Bingham I, Chavez CA, Coleman JP, Fry JR, Gabathuler E, Gamet R, Hutchcroft DE, Payne DJ, Touramanis C, Bevan AJ, Di Lodovico F, Sacco R, Sigamani M, Cowan G, Paramesvaran S, Wren AC, Brown DN, Davis CL, Denig AG, Fritsch M, Gradl W, Hafner A, Alwyn KE, Bailey D, Barlow RJ, Jackson G, Lafferty GD, West TJ, Anderson J, Cenci R, Jawahery A, Roberts DA, Simi G, Tuggle JM, Dallapiccola C, Salvati E, Cowan R, Dujmic D, Fisher PH, Sciolla G, Zhao M, Lindemann D, Patel PM, Robertson SH, Schram M, Biassoni P, Lazzaro A, Lombardo V, Palombo F, Stracka S, Cremaldi L, Godang R, Kroeger R, Sonnek P, Summers DJ, Nguyen X, Simard M, Taras P, De Nardo G, Monorchio D, Onorato G, Sciacca C, Raven G, Snoek HL, Jessop CP, Knoepfel KJ, LoSecco JM, Wang WF, Corwin LA, Honscheid K, Kass R, Morris JP, Rahimi AM, Blount NL, Brau J, Frey R, Igonkina O, Kolb JA, Rahmat R, Sinev NB, Strom D, Strube J, Torrence E, Castelli G, Feltresi E, Gagliardi N, Margoni M, Morandin M, Posocco M, Rotondo M, Simonetto F, Stroili R, Ben-Haim E, Bonneaud GR, Briand H, Calderini G, Chauveau J, Hamon O, Leruste P, Marchiori G, Ocariz J, Prendki J, Sitt S, Biasini M, Manoni E, Rossi A, Angelini C, Batignani G, Bettarini S, Carpinelli M, Casarosa G, Cervelli A, Forti F, Giorgi MA, Lusiani A, Neri N, Paoloni E, Rizzo G, Walsh JJ, Pegna DL, Lu C, Olsen J, Smith AJ, Telnov AV, Anulli F, Baracchini E, Cavoto G, Faccini R, Ferrarotto F, Ferroni F, Gaspero M, Li Gioi L, Mazzoni MA, Piredda G, Renga F, Hartmann T, Leddig T, Schröder H, Waldi R, Adye T, Franek B, Olaiya EO, Wilson FF, Emery S, de Monchenault GH, Vasseur G, Yèche Ch, Zito M, Allen MT, Aston D, Bard DJ, Bartoldus R, Benitez JF, Cartaro C, Convery MR, Dorfan J, Dubois-Felsmann GP, Dunwoodie W, Field RC, Sevilla MF, Fulsom BG, Gabareen AM, Graham MT, Grenier P, Hast C, Innes WR, Kelsey MH, Kim H, Kim P, Kocian ML, Leith DW, Li S, Lindquist B, Luitz S, Luth V, Lynch HL, MacFarlane DB, Marsiske H, Muller DR, Neal H, Nelson S, O'Grady CP, Ofte I, Perl M, Pulliam T, Ratcliff BN, Roodman A, Salnikov AA, Santoro V, Schindler RH, Schwiening J, Snyder A, Su D, Sullivan MK, Sun S, Suzuki K, Thompson JM, Va'vra J, Wagner AP, Weaver M, West CA, Wisniewski WJ, Wittgen M, Wright DH, Wulsin HW, Yarritu AK, Young CC, Ziegler V, Chen XR, Park W, Purohit MV, White RM, Wilson JR, Sekula SJ, Bellis M, Burchat PR, Edwards AJ, Miyashita TS, Ahmed S, Alam MS, Ernst JA, Pan B, Saeed MA, Zain SB, Guttman N, Soffer A, Lund P, Spanier SM, Eckmann R, Ritchie JL, Ruland AM, Schilling CJ, Schwitters RF, Wray BC, Izen JM, Lou XC, Bianchi F, Gamba D, Pelliccioni M, Bomben M, Lanceri L, Vitale L, Lopez-March N, Martinez-Vidal F, Milanes DA, Oyanguren A, Albert J, Banerjee S, Choi HH, Hamano K, King GJ, Kowalewski R, Lewczuk MJ, Nugent IM, Roney JM, Sobie RJ, Gershon TJ, Harrison PF, Latham TE, Puccio EM, Band HR, Dasu S, Flood KT, Pan Y, Prepost R, Vuosalo CO, Wu SL; BABAR Collaboration.

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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