Measurement of the branching fraction, polarization, andCPasymmetries inB0→ρ0ρ0decay, and implications for the CKM angleα

B Aubert,A Seiden,S Emery,D Lopes Pegna,G De Nardo,R Stroili,A Lusiani,A Volk,C H Cheng,H L Lynch,I Ofte,M Pappagallo,E Prencipe,L Vitale,G Vasseur,A C Wren,D Del Re,G B Mohanty,T S Mattison,S Luitz,V Poireau,T J West,R Godang,R Cenci,G Marchiori,D A Hopkins,M Spitznagel,A M Lutz,F Le Diberder,L Wilden,J Béquilleux,D D Altenburg,M Lo Vetere,U Mallik,S I Serednyakov,A Hauke,K J Knoepfel,M T Ronan,F Ferrarotto,S Pacetti,F Anulli,F Salvatore,D A Doll,X R Chen,A K Yarritu,M L Kocian,E Gabathuler,R H Schindler,M Morganti,C Voci,A Roodman,W Park,B Pan,A Palano,P C Bloom,F Simonetto,S Sitt,S Abachi,G Piredda,J D Richman,V Ziegler,F Polci,M Bondioli,I Eschrich,H Jasper,J G Smith,M H Kelsey,H R Band,L Sun,J Anderson,I M Nugent,H U Flaecher,D Su,M Battaglia,B Echenard,N B Sinev,P J Clark,J Serrano,A Santroni,S M Spanier,L Lopez,C Voena,F Di Lodovico,L A Corwin,M Simard,J L Ritchie,G Castelli,D J Payne,G Finocchiaro,Z J Guo,P R Burchat,D J Summers,M Ebert,A Snyder,A D Bukin,B C Shen,J W Gary,S Curry,F Forti,D A Roberts,G Batignani,J R Fry,C L Edgar,M Rama,R Nogowski,C J Flacco,T M Hong,H Marsiske,G M Vitug,M Verderi,R Rahmat,P Taras,T Hartmann,A Zallo,C C Young,S F Ganzhur,M Weaver,E C Martin,L Gladney,V Lepeltier,G Schott,B W Drummond,J Va’Vra,S Passaggio,J P Coleman,M G Wilson,E P Solodov,Q K Wong,H W Zhao,R Ayad,M T Allen,B Stugu,D J Asgeirsson,B Franek,K Wacker,D Gamba,I Bingham,G Lynch,J M Roney,C K Lae,F B Viaud,R Andreassen,P Roudeau,P M Patel,C Hast,S Schenk,J Merkel,A Stocchi,E Di Marco,J J Regensburger,U Uwer,A Calcaterra,K A George,M A Mazzoni,C A Heusch,M Gaspero,L Lanceri,D G Hitlin,M Carpinelli,C J Schilling,H Nicholson,D Monorchio,R Baldini-Ferroli,A M Eisner,M S Alam,D P Stoker,A Petrella,A Oyanguren,G R Bonneaud,B G Fulsom,R J Barlow,M Piccolo,G Grosdidier,M Mandelkern,S J Gowdy,M Morii,J Marks,J Schwiening,G Wormser,M A Saeed,R F Schwitters,J A Mckenna,V Santoro,F Bianchi,A M Rahimi,E Latour,J Chauveau,L Li Gioi,G Cibinetto,O Hamon,M Zito,T Piatenko,H Kagan,C A Chavez,A Jawahery,N Soni,W T Ford,R Schwierz,W T Meyer,P Del Amo Sanchez,M H Schune,R Messner,M Andreotti,M Lu,C Cartaro,W H Toki,A T Watson,M Wittgen,D Kirkby,G P Dubois-Felsmann,S Ahmed,L Del Buono,M Barrett,S Saremi,R Faccini,N Gagliardi,U Nauenberg,R Gamet,G Della Ricca,P H Fisher,M R Convery,C Patrignani,R Contri,G D Lafferty,V P Druzhinin,A R Buzykaev,F Fang,J M Bauer,E Ben-Haim,R Sacco,W Kozanecki,A M Gabareen,G Rizzo,S Bettarini,R Kroeger,J Dorfan,Yu G Kolomensky,S Morganti,R Prepost,W Gradl,S B Zain,H H F Choi,D Aston,K Honscheid,F F Wilson,J P Lees,C Touramanis,W S Lockman,A M Ruland,R De Sangro,B N Ratcliff,A Lazzaro,J Kroseberg,S Playfer,T Schalk,M K Sullivan,A Höcker,A Adametz,G Onorato,G Calderini,R K Yamamoto,D Walker,G Mancinelli,F Liu,F C Porter,Y M Chia,C Dallapiccola,A Buzzo,K E Alwyn,B Bhuyan,M D Sokoloff,D W G S Leith,B Spaan,K Suzuki,D B Macfarlane,R N Cahn,R Kowalewski,A Cecchi,E Feltresi,C Hearty,X Chai,K T Flood,B J Wogsland,G Raven,E Paoloni,C M Hawkes,R Calabrese,M Fritsch,G Cavoto,C Bozzi,S Nelson,M Rotondo,T S Miyashita,I M Peruzzi,D Bettoni,E Salvati,H Briand,N L Blount,V Klose,P Lund,J Prendki,R Bartoldus,H W Wulsin,D J Bard,S J Sekula,H Schröder,P D Dauncey,W R Innes,J I Yi,Z Yasin,R J Wilson,G Eigen,L Piemontese,M A Mazur,F Palombo,A P Onuchin,E Baracchini,A Petzold,K R Schubert,S Pruvot,E I Rosenberg,M Davier,J P Burke,I Narsky,Y Karyotakis,R Cowan,C L Davis,L T Kerth,N Arnaud,X Prudent,J M Tuggle,R G Jacobsen,G S Abrams,T W Beck,W J Wisniewski,J Ocariz,J M Losecco,K A Ulmer,F Renga,A V Telnov,S L Wu,P Franchini,K S Chaisanguanthum,H B Crawley,M Posocco,A J Lankford,M J Lewczuk,A Perazzo,J Albert,R Frey,W Dunwoodie,S Prell,L Bosisio,S H Robertson,R Eckmann,F Ferroni,E Torrence,D A Sanders,V Tisserand,A E Rubin,M Pierini,M Nagel,P Bechtle,S Tosi,A J Bevan,D Strom,G Cowan,M Escalier,V Lombardo,M R Monge,L Lista,J F Benitez,J P Morris,R M White,C Angelini,D Bernard,C P O’Grady,A J S Smith,E Robutti,X Chen,M T Graham,F Taylor,L Zhang,C Sciacca,G Jackson,V Sharma,A J Edwards,K Hamano,D H Wright,C Chen,M Karbach,H Kim,K Tackmann,X Li,B A Schumm,J E Watson,V Azzolini,W F Mader,D Kovalskyi,V Sordini,M Biasini,J Firmino Da Costa,B A Petersen,N Neri,P Kim,E Manoni,A Soffer,K Yi,A Cervelli,G Sciolla,S R Wagner,H Liu,J R Wilson,J Strube,J F Hirschauer,T Adye,M A Giorgi,J M Izen,G Hamel De Monchenault,P David,A V Gritsan,P F Harrison,L Cremaldi,T Tanabe,Y Y Gao,G Simi,S Dasu,M Bóna ,V Lüth ,D Wright ,J Garra Ticó ,L Winstrom ,P Patterí ,H A Neal ,M Macrı́ ,A Denig ,C Lü ,M Kobel ,N López-March ,E Olaiya ,C Vuosalo ,Christopher Clarke ,M Charles ,A J Martínez ,I Osipenkov ,B Meadows ,J Kolb ,Ph Leruste ,A Pérez ,J Walsh ,T Latham ,J Dingfelder ,D Dujmić ,L Estève ,D Hutchcroft ,V Blinov ,M J Tibbetts ,Ch Yèche ,C West ,T Vazquez Schroeder ,T Gershon ,K Yu Todyshev ,H Lacker ,S Majewski ,H Snoek ,X Lou ,M G Zhao ,R Sobie ,E Graugés ,В Б Голубев ,J E Brau ,F Martínez-Vidal ,M Purohit ,J Ernst ,A Dʼorazio ,A Salnikov ,J Nash ,D Lange ,D R Müller ,S Banerjee ,C Jessop ,М Перл ,Dong Liu ,J Kamiński ,J Ilić ,D A Milanés ,C Buchanan,R Waldi,P K Behera,S Li,R Covarelli,G Benelli,S K Swain,W F Wang,M Bomben,J Olsen,J M Thompson,A Gaz,Y Pan,S Paramesvaran,M Pelliccioni,P D Jackson,C Campagnari,K Mishra,B Lindquist,D Bailey,R Kass,M Negrini,M Sigamani,P Grenier,Yu I Skovpen,O Long,M Margoni,A P Wagner,R C Field,D N Brown,M Morandin,E Luppi,O Igonkina,A Khan,J Cochran,H Koch

doi:10.1103/physrevd.78.071104

Abstract

We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.

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