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Branching Fractions and CP Asymmetries in $B^0 \to \pi^0\pi^0, B^+ \to \pi^+\pi^0$ and $B^+ \to K^+\pi^0$ Decays and Isospin Analysis of the $B \to \pi\pi$ System

By B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, J.P. Lees, V. Poireau, V. Tisserand, A. Zghiche, 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, C.T. Day, M.S. Gill, A.V. Gritsan, Y. Groysman, R.G. Jacobsen, R.W. Kadel, J. Kadyk, L.T. Kerth, Yu.G. Kolomensky, G. Kukartsev, G. Lynch, L.M. Mir, P.J. Oddone, T.J. Orimoto, M. Pripstein, N.A. Roe, M.T. Ronan, V.G. Shelkov, W.A. Wenzel, M. Barrett, K.E. Ford, T.J. Harrison, A.J. Hart, C.M. Hawkes, S.E. Morgan, A.T. Watson, M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, M. Steinke, J.T. Boyd, N. Chevalier, W.N. Cottingham, M.P. Kelly, T.E. Latham, F.F. Wilson, T. Cuhadar-Donszelmann, C. Hearty, N.S. Knecht, T.S. Mattison, J.A. McKenna, D. Thiessen, A. Khan, P. Kyberd, L. Teodorescu, A.E. Blinov, V.E. Blinov, V.P. Druzhinin, V.B. Golubev, V.N. Ivanchenko, E.A. Kravchenko, A.P. Onuchin, S.I. Serednyakov, Yu.I. Skovpen, E.P. Solodov, A.N. Yushkov, D. Best, M. Bruinsma, M. Chao, I. Eschrich, D. Kirkby, A.J. Lankford, M. Mandelkern, R.K. Mommsen, W. Roethel, D.P. Stoker, C. Buchanan, B.L. Hartfiel, S.D. Foulkes, J.W. Gary, B.C. Shen, K. Wang, D. Del Re, H.K. Hadavand, E.J. Hill, D.B. MacFarlane, H.P. Paar, Sh. Rahatlou, V. Sharma, J. Adam Cunha, J.W. Berryhill, C. Campagnari, B. Dahmes, T.M. Hong, O. Long, A. Lu, M.A. Mazur, J.D. Richman, W. Verkerke, T.W. Beck, A.M. Eisner, C.A. Heusch, J. Kroseberg, W.S. Lockman, G. Nesom, T. Schalk, B.A. Schumm, A. Seiden, P. Spradlin, D.C. Williams, M.G. Wilson, J. Albert, E. Chen, G.P. Dubois-Felsmann, A. Dvoretskii, D.G. Hitlin, I. Narsky, T. Piatenko, F.C. Porter, A. Ryd, A. Samuel, S. Yang, S. Jayatilleke, G. Mancinelli, B.T. Meadows, M.D. Sokoloff, F. Blanc, P. Bloom, S. Chen, W.T. Ford, U. Nauenberg, A. Olivas, P. Rankin, J.G. Smith, J. Zhang, L. Zhang, A. Chen, J.L. Harton, A. Soffer, W.H. Toki, R.J. Wilson, Q. Zeng, D. Altenburg, T. Brandt, J. Brose, M. Dickopp, E. Feltresi, A. Hauke, H.M. Lacker, R. Muller-Pfefferkorn, R. Nogowski, S. Otto, A. Petzold, J. Schubert, K.R. Schubert, R. Schwierz, B. Spaan, J.E. Sundermann, D. Bernard, G.R. Bonneaud, P. Grenier, S. Schrenk, Ch. Thiebaux, G. Vasileiadis, M. Verderi, D.J. Bard, P.J. Clark, D. Lavin, F. Muheim, S. Playfer, Y. Xie, M. Andreotti, V. Azzolini, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Luppi, M. Negrini, L. Piemontese, A. Sarti, F. Anulli, R. Baldini-Ferroli, A. Calcaterra, R. De Sangro, G. Finocchiaro, P. Patteri, I.M. Peruzzi, M. Piccolo, A. Zallo, A. Buzzo, R. Capra, R. Contri, G. Crosetti, M. Lo Vetere, M. Macri, M.R. Monge, S. Passaggio, C. Patrignani, E. Robutti, A. Santroni, S. Tosi, S. Bailey, G. Brandenburg, K.S. Chaisanguanthum, M. Morii, E. Won, R.S. Dubitzky, U. Langenegger, J. Marks, U. Uwer, W. Bhimji, D.A. Bowerman, P.D. Dauncey, U. Egede, J.R. Gaillard, G.W. Morton, J.A. Nash, M.B. Nikolich, G.P. Taylor, M.J. Charles, G.J. Grenier, U. Mallik, J. Cochran, H.B. Crawley, J. Lamsa, W.T. Meyer, S. Prell, E.I. Rosenberg, A.E. Rubin, J. Yi, M. Biasini, R. Covarelli, M. Pioppi, N. Arnaud, M. Davier, X. Giroux, G. Grosdidier, A. Hocker, F. Le Diberder, V. Lepeltier, A.M. Lutz, T.C. Petersen, Stéphane Plaszczynski, M.H. Schune, G. Wormser, C.H. Cheng, D.J. Lange, M.C. Simani, D.M. Wright, A.J. Bevan, C.A. Chavez, J.P. Coleman, I.J. Forster, J.R. Fry, E. Gabathuler, R. Gamet, D.E. Hutchcroft, R.J. Parry, D.J. Payne, R.J. Sloane, C. Touramanis, C.M. Cormack, F. Di Lodovico, C.L. Brown, G. Cowan, R.L. Flack, H.U. Flaecher, M.G. Green, P.S. Jackson, T.R. McMahon, S. Ricciardi, F. Salvatore, M.A. Winter, D. Brown, C.L. Davis, J. Allison, N.R. Barlow, R.J. Barlow, M.C. Hodgkinson, G.D. Lafferty, A.J. Lyon, J.C. Williams, A. Farbin, W.D. Hulsbergen, A. Jawahery, D. Kovalskyi, C.K. Lae, V. Lillard, D.A. Roberts, G. Blaylock, C. Dallapiccola, S.S. Hertzbach, R. Kofler, V.B. Koptchev, T.B. Moore, S. Saremi, H. Staengle, Stephane Willocq, R. Cowan, G. Sciolla, S.J. Sekula, F. Taylor, R.K. Yamamoto, D.J.J. Mangeol, P.M. Patel, S.H. Robertson, A. Lazzaro, V. Lombardo, F. Palombo, J.M. Bauer, L. Cremaldi, V. Eschenburg, R. Godang, R. Kroeger, J. Reidy, D.A. Sanders, D.J. Summers, H.W. Zhao, S. Brunet, D. Cote, P. Taras, H. Nicholson, N. Cavallo, F. Fabozzi, C. Gatto, L. Lista, D. Monorchio, P. Paolucci, D. Piccolo, C. Sciacca, M. Baak, H. Bulten, G. Raven, H.L. Snoek, L. Wilden, C.P. Jessop, J.M. LoSecco, T. Allmendinger, K.K. Gan, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. Pulliam, A.M. Rahimi, R. Ter-Antonyan, Q.K. Wong, J. Brau, R. Frey, O. Igonkina, 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, G. Tiozzo, C. Voci, M. Benayoun, H. Briand, J. Chauveau, P. David, L. Del Buono, Ch. De La Vaissiere, O. Hamon, M.J.J. John, Ph. Leruste, J. Malcles, J. Ocariz, L. Roos, G. Therin, P.F. Manfredi, V. Re, P.K. Behera, L. Gladney, Q.H. Guo, J. Panetta, C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bucci, G. Calderini, 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, J. Walsh, M. Haire, D. Judd, K. Paick, D.E. Wagoner, N. Danielson, P. Elmer, Y.P. Lau, C. Lu, V. Miftakov, J. Olsen, A.J.S. Smith, A.V. Telnov, F. Bellini, G. Cavoto, R. Faccini, F. Ferrarotto, F. Ferroni, M. Gaspero, L. Li Gioi, M.A. Mazzoni, S. Morganti, M. Pierini, G. Piredda, F. Safai Tehrani, C. Voena, S. Christ, G. Wagner, R. Waldi, T. Adye, N. De Groot, B. Franek, N.I. Geddes, G.P. Gopal, E.O. Olaiya, R. Aleksan, S. Emery, A. Gaidot, S.F. Ganzhur, P.-F. Giraud, G. Hamel De Monchenault, W. Kozanecki, M. Legendre, G.W. London, B. Mayer, G. Schott, G. Vasseur, Ch. Yeche, M. Zito, M.V. Purohit, A.W. Weidemann, J.R. Wilson, F.X. Yumiceva, T. Abe, D. Aston, R. Bartoldus, N. Berger, A.M. Boyarski, O.L. Buchmueller, R. Claus, M.R. Convery, M. Cristinziani, G. De Nardo, D. Dong, J. Dorfan, D. Dujmic, W. Dunwoodie, E.E. Elsen, S. Fan, R.C. Field, T. Glanzman, S.J. Gowdy, T. Hadig, V. Halyo, C. Hast, T. Hryn'Ova, W.R. Innes, M.H. Kelsey, P. Kim, M.L. Kocian, D.W.G.S. Leith, J. Libby, S. Luitz, V. Luth, H.L. Lynch, H. Marsiske, R. Messner, D.R. Muller, C.P. O'Grady, V.E. Ozcan, A. Perazzo, M. Perl, S. Petrak, B.N. Ratcliff, A. Roodman, A.A. Salnikov, R.H. Schindler, J. Schwiening, G. Simi, A. Snyder, A. Soha, J. Stelzer, D. Su, M.K. Sullivan, J. Va'Vra, S.R. Wagner, M. Weaver, A.J.R. Weinstein, W.J. Wisniewski, M. Wittgen, D.H. Wright, A.K. Yarritu, C.C. Young, P.R. Burchat, A.J. Edwards, T.I. Meyer, B.A. Petersen, C. Roat, M. Ahmed, S. Ahmed, M.S. Alam, J.A. Ernst, M.A. Saeed, M. Saleem, F.R. Wappler, W. Bugg, M. Krishnamurthy, S.M. Spanier, R. Eckmann, H. Kim, J.L. Ritchie, A. Satpathy, R.F. Schwitters, J.M. Izen, I. Kitayama, X.C. Lou, S. Ye, F. Bianchi, M. Bona, F. Gallo, D. Gamba, L. Bosisio, C. Cartaro, F. Cossutti, G. Della Ricca, S. Dittongo, S. Grancagnolo, L. Lanceri, P. Poropat, L. Vitale, G. Vuagnin, R.S. Panvini, Sw. Banerjee, C.M. Brown, D. Fortin, P.D. Jackson, R. Kowalewski, J.M. Roney, R.J. Sobie, J.J. Back, P.F. Harrison, G.B. Mohanty, H.R. Band, X. Chen, B. Cheng, S. Dasu, M. Datta, A.M. Eichenbaum, K.T. Flood, M. Graham, J.J. Hollar, J.R. Johnson, P.E. Kutter, H. Li, R. Liu, A. Mihalyi, Y. Pan, R. Prepost, P. Tan, J.H. Von Wimmersperg-Toeller, J. Wu, S.L. Wu, Z. Yu, M.G. Greene and H. Neal

Abstract

BABARBased on a sample of 227 million BBbar pairs collected by the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0 -> pi0pi0) = (1.17 +- 0.32 +- 0.10) x 1e-6, and the asymmetry C(pi0pi0) = -0.12 +- 0.56 +- 0.06. The B0 -> pi0pi0 signal has a significance of 5.0 sigma. We also measure B(B+ -> pi+pi0) = (5.8 +- 0.6 +- 0.4) x 1e-6, B(B+ -> K+pi0) = (12.0 +- 0.7 +- 0.6) x 1e-6, and the charge asymmetries A(pi+pi0) = -0.01 +- 0.10 +- 0.02 and A(K+pi0) = 0.06 +- 0.06 +- 0.01. Using isospin relations we find an upper bound on the angle difference |alpha - alpha(eff)| of 35 degrees at the 90% C.L

Topics: 13.25.Hw, 11.30.Er, 12.15.Hh, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2005
DOI identifier: 10.1103/PhysRevLett.94.181802
OAI identifier: oai:HAL:in2p3-00024276v1
Provided by: Hal-Diderot
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