Search for the decayD0→γγand measurement of the branching fraction forD0→π0π0

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

doi:10.1103/physrevd.85.091107

Abstract

We search for the rare decay of the D0 meson to two photons, D0→γγ, and present a measurement of the branching fraction for a D0 meson decaying to two neutral pions, B(D0→π0π0). The data sample analyzed corresponds to an integrated luminosity of 470.5 fb−1 collected by the BABAR detector at the PEP-II asymmetric-energy e+e− collider at SLAC. We place an upper limit on the branching fraction, B(D0→γγ)<2.2×10−6, at 90% confidence level. This limit improves on the existing limit by an order of magnitude. We also find B(D0→π0π0)=(8.4±0.1±0.4±0.3)×10−4.Received 28 October 2011DOI:https://doi.org/10.1103/PhysRevD.85.091107© 2012 American Physical Society

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