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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 97, p. -

Observation of B+→K̄0K+ and B0→K0K̄0

Aubert B., Bona M., Boutigny D., Couderc F., Karyotakis Y., Lees J. P., Poireau V., Tisserand V., Zghiche A., Grauges E., Palano A., Chen J. C., Qi N. D., Rong G., Wang P., Zhu Y. S., Eigen G., Ofte I., Stugu B., Abrams G. S., Battaglia M., Brown D. N., Brown D. N., Button-Shafer J., Cahn R. N., Charles E., Gill M. S., Groysman Y., Jacobsen R. G., Kadyk J. A., Kerth L. T., Kolomensky Yu G., Kukartsev G., Lynch G., Mir L. M., Orimoto T. J., Pripstein M., Roe N. A., Ronan M. T., Wenzel W. A., del Amo Sanchez P., Barrett M., Ford K. E., Harrison T. J., Hart A. J., Hawkes C. M., Watson A. T., Held T., Koch H., Lewandowski B., Pelizaeus M., Peters K., Schroeder T., Steinke M., Boyd J. T., Burke J. P., Cottingham W. N., Walker D., Asgeirsson D. J., Cuhadar-Donszelmann T., Fulsom B. G., Hearty C., Knecht N. S., Mattison T. S., McKenna J. A., Khan A., Kyberd P., Saleem M., Sherwood D. J., Teodorescu L., Blinov V. E., Bukin A. D., Druzhinin V. P., Golubev V. B., Onuchin A. P., Serednyakov S. I., Skovpen Y. I., Solodov E. P., Todyshev K. Y., Bondioli M., Bruinsma M., Chao M., Curry S., Eschrich I., Kirkby D., Lankford A. J., Lund P., Mandelkern M., Mommsen R. K., Roethel W., Stoker D. P., Abachi S., Buchanan C., Foulkes S. D., Gary J. W., Long O., Shen B. C., Wang K., Zhang L., Hadavand H. K.

We report observations of the b→d penguin-dominated decays B+→K̄0K+ and B0→K0K̄0 in 316fb-1 of e+e- collision data collected with the BABAR detector. We measure the branching fractions B(B+→K̄0K+)=(1.61±0.44±0.09)×10-6 and B(B0→K0K̄0)=(1.08±0.28±0.11)×10-6 and the CP-violating charge asymmetry ACP(K̄0K+)=0.10±0.26±0.03. Using a vertexing technique previously employed in several analyses of all-neutral final states containing kaons, we report the first measurement of time-dependent CP-violating asymmetries in B0→KS0KS0, obtaining S=-1.28-0.73-0.16+0.80+0.11 and C=-0.40±0.41±0.06. We also report improved measurements of the branching fraction B(B+→K0π+)=(23. 9±1.1±1.0)×10-6 and CP-violating charge asymmetry ACP(K0π+)=-0.029±0.039±0.010. © 2006 The American Physical Society.