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Observation of a significant excess of $\pi^{0}\pi^{0}$ events in B meson decays

B. Aubert 1 R. Barate 1 D. Boutigny 1 J.M. Gaillard 1 A. Hicheur 1 Y. Karyotakis 1 J.P. Lees 1 P. Robbe 1 V. Tisserand 1 A. Zghiche 1 A. Palano A. Pompili J.C. Chen N.D. Qi G. Rong P. Wang Y.S. Zhu G. Eigen I. Ofte B. Stugu G.S. Abrams A.W. Borgland A.B. Breon D.N. Brown J. Button-Shafer R.N. Cahn E. Charles M.S. Gill A.V. Gritsan Y. Groysman R.G. Jacobsen R.W. Kadel J. Kadyk L.T. Kerth Yu.G. Kolomensky J.F. Kral Céline Leclerc G. Lynch L.M. Mir P.J. Oddone T.J. Orimoto M. Pripstein N.A. Roe A. Romosan M.T. Ronan V.G. Shelkov A.V. Telnov W.A. Wenzel T.J. Harrison C.M. Hawkes D.J. Knowles S.W. O'Neale R.C. Penny A.T. Watson N.K. Watson T. Deppermann K. Goetzen H. Koch B. Lewandowski K. Peters H. Schmuecker M. Steinke N.R. Barlow W. Bhimji J.T. Boyd N. Chevalier P.J. Clark W.N. Cottingham C. Mackay F.F. Wilson K. Abe C. Hearty T.S. Mattison J.A. Mckenna D. Thiessen S. Jolly A.K. Mckemey V.E. Blinov A.D. Bukin A.R. Buzykaev V.B. Golubev V.N. Ivanchenko A.A. Korol E.A. Kravchenko A.P. Onuchin S.I. Serednyakov Yu.I. Skovpen A.N. Yushkov D. Best M. Chao D. Kirkby A.J. Lankford M. Mandelkern S. Mcmahon D.P. Stoker C. Buchanan S. Chun H.K. Hadavand E.J. Hill D.B. Macfarlane H. Paar S. Prell S. Rahatlou G. Raven V. Sharma J.W. Berryhill C. Campagnari B. Dahmes P.A. Hart N. Kuznetsova S.L. Levy O. Long M.A. Mazur J.D. Richman W. Verkerke J. Beringer A.M. Eisner M. Grothe C.A. Heusch W.S. Lockman T. Pulliam T. Schalk R.E. Schmitz B.A. Schumm A. Seiden M. Turri W. Walkowiak D.C. Williams M.G. Wilson E. Chen G.P. Dubois-Felsmann A. Dvoretskii D.G. Hitlin F.C. Porter A. Ryd A. Samuel S. Yang S. Jayatilleke G. Mancinelli B.T. Meadows M.D. Sokoloff T. Barillari P. Bloom W.T. Ford U. Nauenberg A. Olivas P. Rankin J. Roy J.G. Smith W.C. van Hoek L. Zhang J.L. Harton T. Hu M. Krishnamurthy A. Soffer W.H. Toki R.J. Wilson J. Zhang D. Altenburg T. Brandt J. Brose T. Colberg M. Dickopp R.S. Dubitzky A. Hauke E. Maly R. Muller-Pfefferkorn S. Otto K.R. Schubert R. Schwierz B. Spaan L. Wilden D. Bernard G.R. Bonneaud F. Brochard J. Cohen-Tanugi P. Grenier C. Thiebaux G. Vasileiadis M. Verderi A. Anjomshoaa R. Bernet A. Khan D. Lavin F. Muheim S. Playfer J.E. Swain J. Tinslay M. Falbo C. Borean C. Bozzi L. Piemontese A. Sarti E. Treadwell F. Anulli R. Baldini-Ferroli A. Calcaterra R. de Sangro D. Falciai G. Finocchiaro P. Patteri I.M. Peruzzi M. Piccolo A. Zallo S. Bagnasco A. Buzzo R. Contri G. Crosetti M. Lo Vetere M. Macri M.R. Monge F.C. Pastore C. Patrignani E. Robutti A. Santroni S. Tosi S. Bailey M. Morii R. Bartoldus G.J. Grenier U. Mallik J. Cochran H.B. Crawley J. Lamsa W.T. Meyer E.I. Rosenberg J. Yi M. Davier 2 G. Grosdidier 2 A. Hocker 2 S. Laplace 2 F. Le Diberder 2 V. Lepeltier 2 A.M. Lutz 2 T.C. Petersen 2 Stéphane Plaszczynski 2 M.H. Schune 2 L. Tantot 2 G. Wormser 2 R.M. Bionta V. Brigljevic D.J. Lange K. van Bibber D.M. Wright A.J. Bevan J.R. Fry E. Gabathuler R. Gamet M. George M. Kay D.J. Payne R.J. Sloane C. Touramanis M.L. Aspinwall D.A. Bowerman P.D. Dauncey U. Egede I. Eschrich G.W. Morton J.A. Nash P. Sanders D. Smith G.P. Taylor J.J. Back G. Bellodi P. Dixon P.F. Harrison R.J.L. Potter H.W. Shorthouse P. Strother P.B. Vidal G. Cowan H.U. Flaecher S. George M.G. Green A. Kurup C.E. Marker T.R. Mcmahon S. Ricciardi F. Salvatore G. Vaitsas M.A. Winter D. Brown C.L. Davis J. Allison R.J. Barlow A.C. Forti F. Jackson G.D. Lafferty A.J. Lyon N. Savvas J.H. Weatherall J.C. Williams A. Farbin A. Jawahery V. Lillard D.A. Roberts J.R. Schieck G. Blaylock C. Dallapiccola K.T. Flood S.S. Hertzbach R. Kofler V.B. Koptchev T.B. Moore H. Staengle S. Willocq B. Brau R. Cowan G. Sciolla F. Taylor R.K. Yamamoto M. Milek P.M. Patel F. Palombo J.M. Bauer L. Cremaldi V. Eschenburg R. Kroeger J. Reidy D.A. Sanders D.J. Summers C. Hast P. Taras H. Nicholson N. Cavallo G. de Nardo F. Fabozzi C. Gatto L. Lista P. Paolucci D. Piccolo C. Sciacca J.M. Losecco J.R.G. Alsmiller T.A. Gabriel J. Brau R. Frey M. Iwasaki C.T. Potter N.B. Sinev D. Strom E. Torrence F. Colecchia A. Dorigo F. Galeazzi M. Margoni M. Morandin M. Posocco M. Rotondo F. Simonetto R. Stroili C. Voci M. Benayoun H. Briand J. Chauveau P. David C. de la Vaissiere L. del Buono O. Hamon M.J.J. John P. Leruste J. Ocariz M. Pivk L. Roos J. Stark S. t'Jampens G. Therin P.F. Manfredi V. Re V. Speziali L. Gladney Q.H. Guo J. Panetta C. Angelini G. Batignani S. Bettarini M. Bondioli F. Bucci G. Calderini E. Campagna M. Carpinelli F. Forti M.A. Giorgi A. Lusiani G. Marchiori F. Martinez-Vidal M. Morganti N. Neri E. Paoloni M. Rama G. Rizzo F. Sandrelli G. Triggiani J. Walsh M. Haire D. Judd K. Paick L. Turnbull D.E. Wagoner J. Albert N. Danielson P. Elmer C. Lu V. Miftakov J. Olsen S.F. Schaffner A.J.S. Smith A. Tumanov E.W. Varnes F. Bellini G. Cavoto D. del Re R. Faccini F. Ferrarotto F. Ferroni Emilio Leonardi S. Morganti G. Piredda F. Safai Tehrani M. Serra C. Voena S. Christ G. Wagner R. Waldi T. Adye N. de Groot B. Franek N.I. Geddes G.P. Gopal S.M. Xella R. Aleksan S. Emery A. Gaidot P.F. Giraud S.F. Ganzhur G. Hamel de Monchenault W. Kozanecki M. Langer M. Legendre G.W. London B. Mayer G. Schott G. Vasseur C. Yeche M. Zito M.V. Purohit A.W. Weidemann F.X. Yumiceva I. Adam D. Aston N. Berger A.M. Boyarski M.R. Convery D.P. Coupal D. Dong J. Dorfan W. Dunwoodie R.C. Field T. Glanzman S.J. Gowdy E. Grauges T. Haas T. Hadig V. Halyo T. Himel T. Hrynova M.E. Huffer W.R. Innes C.P. Jessop M.H. Kelsey P. Kim M.L. Kocian U. Langenegger D.W.G.S. Leith S. Luitz V. Luth H.L. Lynch H. Marsiske S. Menke R. Messner D.R. Muller C.P. O'Grady V.E. Ozcan A. Perazzo M. Perl S. Petrak H. Quinn B.N. Ratcliff S.H. Robertson A. Roodman A.A. Salnikov T. Schietinger R.H. Schindler J. Schwiening G. Simi A. Snyder A. Soha S.M. Spanier J. Stelzer D. Su M.K. Sullivan H.A. Tanaka J. Vavra S.R. Wagner M. Weaver A.J.R. Weinstein W.J. Wisniewski D.H. Wright C.C. Young P.R. Burchat C.H. Cheng T.I. Meyer C. Roat R. Henderson W. Bugg H. Cohn J.M. Izen I. Kitayama X.C. Lou F. Bianchi M. Bona D. Gamb L. Bosisio G. Della Ricca S. Dittongo L. Lanceri P. Poropat L. Vitale G. Vuagnin R.S. Panvini S. Banerjee C.M. Brown D. Fortin P.D. Jackson R. Kowalewski J.M. Roney H.R. Band S. Dasu M. Datta A.M. Eichenbaum H. Hu J.R. Johnson R. Liu F. Di Lodovico A. Mohapatra Y. Pan R. Prepost I.J. Scott S.J. Sekula J.H. von Wimmersperg-Toeller J. Wu S.L. Wu Z. Yu H. Neal
1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : We present an observation of the decay $B^{0} \to \pi^{0} \pi^{0}$ based on a sample of 124 million $B\bar{B}$ pairs recorded by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We observe $46 \pm 13 \pm 3$ events, where the first error is statistical and the second is systematic, corresponding to a significance of 4.2 standard deviations including systematic uncertainties. We measure the branching fraction $\BR(B^{0} \to \pi^{0} \pi^{0}) = (2.1 \pm 0.6 \pm 0.3) \times 10^{-6}$, averaged over $B^{0}$ and $\bar{B}^{0}$ decays.
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Submitted on : Friday, January 16, 2004 - 4:28:53 PM
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B. Aubert, R. Barate, D. Boutigny, J.M. Gaillard, A. Hicheur, et al.. Observation of a significant excess of $\pi^{0}\pi^{0}$ events in B meson decays. Physical Review Letters, American Physical Society, 2003, 91, pp.241801-1-7. ⟨in2p3-00020250⟩

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