2005Physical Review LettersOpen access

Branching Fractions and CP Asymmetries in B0→π0π0 , B+→π+π0 , and B+→K+π0 Decays and Isospin Analysis of the B→ππ System

B. Aubert, R Barate, D Boutigny, F Couderc, Y Karyotakis, J. P. Lees, V Poireau, V. Tisserand, A. Zghiche, E. Graugés, 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, Pier Oddone, T. Orimoto, M. Pripstein, Natalie A. Roe, M. T. Ronan, W. A. Wenzel, M. D. Barrett, K. E. Ford, T. J. Harrison, A. Hart, C. M. Hawkes, S. E. Morgan, A. T. Watson, M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, T. Vazquez Schroeder, Maria Steinke, J. Boyd, N. Chevalier, W. N. Cottingham, M. Kelly, T. Latham, F. F. Wilson, T. Çuhadar-Dönszelmann, C. Hearty, N. S. Knecht, T. S. Mattison, J. A. McKenna, D. Thiessen, Ahsan Khan, P. Kyberd, L. Teodorescu, A. E. Blinov, V. E. Blinov, В. П. Дружинин, V. B. Golubev, V. Ivanchenko, Е. А. Кравченко, А. П. Онучин, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, A. N. Yushkov, David 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, A. J. Weinstein, S. D. Foulkes, J. W. Gary, O. R. Long, B. C. Shen, K. Wang, D. Del Re, H. K. Hadavand, E. J. Hill, D. B. MacFarlane, H. P. Paar, S. Rahatlou, V. Sharma, J. Berryhill, C. Campagnari, A. Cunha, B. Dahmes, T. M. Hong, A. Lu, M. 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. Rýd, A. Samuel, S. Yang, S. Jayatilleke, G. Mancinelli, J. V. Mead, M. D. Sokoloff, F. Blanc, P. Bloom, S. Chen, W. T. Ford, U. Nauenberg, A. Olivas, P. Rankin, W. O. Ruddick, J. Smith, K. A. Ulmer, J Zhang, L Zhang, A. Chen, E. A. Eckhart, J. L. Harton, A. Soffer, W. H. Toki, R. J. Wilson, Q. Zeng, B. Spaan, D. D. Altenburg, T. Brandt, J. Brose, M. Dickopp, E. Feltresi, A. Hauke, H. M. Lacker, R. Nogowski, S. Otto, Andreas Petzold, J. Schubert, K. R. Schubert, R. Schwierz, J. E. Sundermann, David Bernard, G. R. Bonneaud, P. Grenier, S. Schrenk, Ch. Thiebaux, G. Vasileiadis, M. Verderi, D. J. Bard, P. J. Clark, F. Muheim, S. Playfer, Y. Xie, M. Andreotti, V. Azzolini, Dario 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. Macrì, 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. Nash, M. B. Nikolich, G. P. Taylor, M. Charles, G. J. Grenier, U. Mallik, J. Cochran, H. B. Crawley, J. Lamsa, W.T. Meyer, S. Prell, E. I. Rosenberg, A. Rubin, J. I. Yi, N. Arnaud, M. Davier, X. Giroux, G. Grosdidier, A. Höcker, F. Le Diberder, V. Lepeltier, A.M. Lutz, T. C. Petersen, S. Plaszczynski, M. H. Schune, G. Wormser, C. H. Cheng, D. J. Lange, M. C. Simani, D. Wright, A. J. Bevan, C. A. Chavez, J. P. Coleman, I. J. Forster, J. R. Fry, E. Gabathuler, R. Gamet, D. Hutchcroft, R. J. Parry, D.J. Payne, 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. Barlow, R. J. Barlow, M. C. Hodgkinson, G. Lafferty, J. C. Williams, C. Chen, 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, S. Willocq, R. Cowan, K. Köneke, G. Sciolla, S. J. Sekula, F. Ë. Taylor, R. K. Yamamoto, Piyush 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. Côté, 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, G. Benelli, K. K. Gan, K. Honscheid, D. Hufnagel, H. Kagan, R. D. Kass, T. Pulliam, A. M. Rahimi, R. Ter-Antonyan, Q. K. Wong, J. Brau, R. Frey, O. Igonkina, M. Lu, 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, Pierre David, Ch. de la Vaissière, L. Del Buono, O. Hamon, M. John, Ph. Leruste, J. Malclès, J. Ocariz, L. Roos, G. Thérin, P. K. Behera, L. Gladney, Q. H. Guo, J. Panetta, M. Biasini, R. Covarelli, M. Pioppi, C. Angelini, G. Batignani, S. Bettarini, M. Bondioli, F. Bucci, G. Calderini, M. Carpinelli, F. Forti, M. A. Giorgi, A. Lusiani, G. Marchiori, M. Morganti, N. Néri, E. Paoloni, M. Rama, G. Rizzo, G. Simi, J. Walsh, M. Haire, D. Judd, K. Paick, D E Wagoner, N. Danielson, P. Elmer, Y. P. Lau, C. Lü, V. Miftakov, J. Olsen, A. Smith, A. V. Telnov, F. Bellini, G. Cavoto, A. D’Orazio, E. Di Marco, R. Faccini, F. Ferrarotto, F. Ferroni, M. Gaspero, L. Li Gioi, M. A. Mazzoni, S. Morganti, M. Pierini, G. Piredda, F. Polci, F. Safai Tehrani, C. Voena, S. Christ, H. Schröder, G. Wagner, R. Waldi, T. Adye, N. De Groot, B. Franek, 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. Yèche, M. Zito, M. V. Purohit, A. W. Weidemann, R. J. Wilson, F. X. Yumiceva, T. Abe, M. T. Allen, D. Aston, R. Bartoldus, N. Berger, A. M. Boyarski, O. L. Buchmueller, R. Claus, M. R. Convery, M. Cristinziani, G. De Nardo, J. Dingfelder, D. Dong, J. Dorfan, D. Dujmić, W. Dunwoodie, Saijun 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. Kocian, D. W. G. S. Leith, J. Libby, S. Luitz, V. Lüth, H. L. Lynch, H. Marsiske, R. Messner, D.R. Muller, C. P. O’Grady, V. E. Ozcan, A. Perazzo, M. Perl, B. N. Ratcliff, A. Roodman, A. A. Salnikov, R. H. Schindler, J. Schwiening, A. Snyder, A. Soha, J. Stelzer, J. Strube, D. Su, M. K. Sullivan, J. M. Thompson, J. Va’vra, S. R. Wagner, M. Weaver, W. J. Wisniewski, M. Wittgen, D. H. Wright, A. K. Yarritu, C. C. Young, P R Burchat, A. J. Edwards, S. Majewski, B A Petersen, C. Roat, M.W. Ahmed, S. Ahmed, M. S. Alam, J. Ernst, M. A. Saeed, M. Saleem, F. Wappler, W. Bugg, M Krishnamurthy, S. 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. Bóna, 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, F. Martínez-Vidal, R. S. Panvini, Sw. Banerjee, B. Bhuyan, C. M. Brown, D. Fortin, P. Jackson, R. Kowalewski, J. M. Roney, R. 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. Mihályi, Y. Pan, R. Prepost, P. Tan, J. H. von Wimmersperg-Toeller, J. Wu, S. L. Wu, Z. Yu, M. G. Greene, H. A. Neal

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Abstract

Based on a sample of $227\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC, we measure the branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=(1.17\ifmmode\pm\else\textpm\fi{}0.32\ifmmode\pm\else\textpm\fi{}0.10)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and the asymmetry ${C}_{{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}}=\ensuremath{-}0.12\ifmmode\pm\else\textpm\fi{}0.56\ifmmode\pm\else\textpm\fi{}0.06$. The ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ signal has a significance of $5.0\ensuremath{\sigma}$. We also measure $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})=(5.8\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{0})=(12.0\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and the charge asymmetries ${\mathcal{A}}_{{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}}=\ensuremath{-}0.01\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.02$ and ${\mathcal{A}}_{{K}^{+}{\ensuremath{\pi}}^{0}}=0.06\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.01$. Using isospin relations, we find an upper bound on the angle difference $|\ensuremath{\alpha}\ensuremath{-}{\ensuremath{\alpha}}_{\mathrm{eff}}|$ of 35\ifmmode^\circ\else\textdegree\fi{} at the 90% C.L.

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Based on a sample of $227\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC, we measure the branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=(1.17\ifmmode\pm\else\textpm\fi{}0.32\ifmmode\pm\else\textpm\fi{}0.10)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and the asymmetry ${C}_{{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}}=\ensuremath{-}0.12\ifmmode\pm\else\textpm\fi{}0.56\ifmmode\pm\else\textpm\fi{}0.06$. The ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ signal has a significance of $5.0\ensuremath{\sigma}$. We also measure $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})=(5.8\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{0})=(12.0\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and the charge asymmetries ${\mathcal{A}}_{{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}}=\ensuremath{-}0.01\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.02$ and ${\mathcal{A}}_{{K}^{+}{\ensuremath{\pi}}^{0}}=0.06\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.01$. Using isospin relations, we find an upper bound on the angle difference $|\ensuremath{\alpha}\ensuremath{-}{\ensuremath{\alpha}}_{\mathrm{eff}}|$ of 35\ifmmode^\circ\else\textdegree\fi{} at the 90% C.L.

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Available abstract

Based on a sample of $227\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC, we measure the branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=(1.17\ifmmode\pm\else\textpm\fi{}0.32\ifmmode\pm\else\textpm\fi{}0.10)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and the asymmetry ${C}_{{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}}=\ensuremath{-}0.12\ifmmode\pm\else\textpm\fi{}0.56\ifmmode\pm\else\textpm\fi{}0.06$. The ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ signal has a significance of $5.0\ensuremath{\sigma}$. We also measure $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})=(5.8\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{0})=(12.0\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and the charge asymmetries ${\mathcal{A}}_{{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}}=\ensuremath{-}0.01\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.02$ and ${\mathcal{A}}_{{K}^{+}{\ensuremath{\pi}}^{0}}=0.06\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.01$. Using isospin relations, we find an upper bound on the angle difference $|\ensuremath{\alpha}\ensuremath{-}{\ensuremath{\alpha}}_{\mathrm{eff}}|$ of 35\ifmmode^\circ\else\textdegree\fi{} at the 90% C.L.

Key concepts: Physics, Branching fraction, Branching (polymer chemistry), Asymmetry, Particle physics, Analytical Chemistry (journal), Nuclear physics, Materials science

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Branching Fractions and CP Asymmetries in B0→π0π0 , B+→π+π0 , and B+→K+π0 Decays and Isospin Analysis of the B→ππ System — Research Paper | ScholarLens