Evidence for the h b(1P) meson in the decay ?(3S) →π 0h b(1P)

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

user-5f8cf9244c775ec6fa691c99（2011）

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摘要

Using a sample of 122×10^6 Υ(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the h_b(1P) spin-singlet partner of the P-wave χ_(bJ)(1P) states in the sequential decay Υ(3S)→π^0h_b(1P), hb(1P)→γη_b(1S). We observe an excess of events above background in the distribution of the recoil mass against the π0 at mass 9902±4(stat)±2(syst) MeV/c^2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat)±0.9(syst))×10^(-4) for the product branching fraction B(Υ(3S)→π^0h_b)×B(h_b→γη_b).

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关键词

Branching fraction,Particle decay,Meson,Electron–positron annihilation,Lepton,Antiparticle,Hadron,Dimensionless quantity,Nuclear physics,Physics

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