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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 94, p. -

Branching fractions and CP asymmetries in B0â†'Ï€ 0Ï€0, B+â†'Ï€+Ï€0, and B+â†'K+Ï€0 decays and isospin analysis of the Bâ†'ππ system

Aubert B., Barate R., Boutigny D., Couderc F., Karyotakis Y., Lees J. P., Poireau V., Tisserand V., Zghiche A., Grauges-Pous E., Palano A., Pompili A., Chen J. C., Qi N. D., Rong G., Wang P., Zhu Y. S., Eigen G., Ofte I., Stugu B., Abrams G. S., Borgland A. W., Breon A. B., Brown D. N., Button-Shafer J., Cahn R. N., Charles E., Day C. T., Gill M. S., Gritsan A. V., Groysman Y., Jacobsen R. G., Kadel R. W., Kadyk J., Kerth L. T., Kolomensky Yu G., Kukartsev G., Lynch G., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Ronan M. T., Wenzel W. A., Barrett M., Ford K. E., Harrison T. J., Hart A. J., Hawkes C. M., Morgan S. E., Watson A. T., Fritsch M., Goetzen K., Held T., Koch H., Lewandowski B., Pelizaeus M., Schroeder T., Steinke M., Boyd J. T., Chevalier N., Cottingham W. N., Kelly M. P., Latham T. E., Wilson F. F., Cuhadar-Donszelmann T., Hearty C., Knecht N. S., Mattison T. S., McKenna J. A., Thiessen D., Khan A., Kyberd P., Teodorescu L., Blinov A. E., Blinov V. E., Druzhinin V. P., Golubev V. B., Ivanchenko V. N., Kravchenko E. A., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Solodov E. P., Yushkov A. N., Best D., Bruinsma M., Chao M., Eschrich I., Kirkby D., Lankford A. J., Mandelkern M., Mommsen R. K., Roethel W., Stoker D. P.

Based on a sample of 227Ã-106 BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0â†'Ï€0Ï€0)=(1. 17±0.32±0.10)Ã-10-6, and the asymmetry CÏ€0Ï€0=-0.12±0.56±0.06. The B0â†'Ï€0Ï€0 signal has a significance of 5.0Ï. We also measure B(B+â†'Ï€+Ï€0)=(5. 8±0.6±0.4)Ã-10-6, B(B+â†'K+Ï €0)=(12.0±0.7±0.6)Ã-10-6, and the charge asymmetries AÏ€+Ï€0=-0.01±0. 10±0.02 and AK+Ï€0=0.06±0. 06±0.01. Using isospin relations, we find an upper bound on the angle difference |α-αeff| of 35° at the 90% C.L. © 2005 The American Physical Society.