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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2008, vol. 100, p. -

Observation of B+→a1+(1260)K0 and B0→a1-(1260)K+

Aubert B., Bona M., Boutigny D., Karyotakis Y., Lees J. P., Poireau V., Prudent X., Tisserand V., Zghiche A., Garra Tico J., Grauges E., Lopez L., Palano A., Pappagallo M., Eigen G., Stugu B., Sun L., Abrams G. S., Battaglia M., Brown D. N., Button-Shafer J., Cahn R. N., Groysman Y., Jacobsen R. G., Kadyk J. A., Kerth L. T., Kolomensky Yu G., Kukartsev G., Lopes Pegna D., Lynch G., Mir L. M., Orimoto T. J., Osipenkov I. L., Ronan M. T., Tackmann K., Tanabe T., Wenzel W. A., Del Amo Sanchez P., Hawkes C. M., Watson A. T., Koch H., Schroeder T., Walker D., Asgeirsson D. J., Cuhadar-Donszelmann T., Fulsom B. G., Hearty C., Mattison T. S., McKenna J. A., Barrett M., Khan A., Saleem M., Teodorescu L., Blinov V. E., Bukin A. D., Druzhinin V. P., Golubev V. B., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Solodov E. P., Todyshev K. Yu, Bondioli M., Curry S., Eschrich I., Kirkby D., Lankford A. J., Lund P., Mandelkern M., Martin E. C., Stoker D. P., Abachi S., Buchanan C., Foulkes S. D., Gary J. W., Liu F., Long O., Shen B. C., Vitug G. M., Zhang L., Paar H. P., Rahatlou S., Sharma V., Berryhill J. W., Campagnari C., Cunha A., Dahmes B., Hong T. M., Kovalskyi D., Richman J. D., Beck T. W., Eisner A. M., Flacco C. J., Heusch C. A., Kroseberg J., Lockman W. S., Schalk T., Schumm B. A., Seiden A., Wilson M. G.

We present branching fraction measurements of the decays B+→a1+(1260)K0 and B0→a1-(1260)K+ with a1±(1260)→π π±π±. The data sample corresponds to 383×106 BB̄ pairs produced in e+e- annihilation through the Υ(4S) resonance. We measure the products of the branching fractions B(B+→a1+(1260)K0)B(a1+(1260) →π-π+π+)=(17.4±2.5±2.2)×10-6 and B(B0→a1-(1260)K+)B(a1-(1260)→π+π-π-)=(8.2±1. 5±1.2)×10-6. We also measure the charge asymmetries Ach(B+→a1+(1260)K0)=0.12±0.11±0.02 and Ach(B0→a1-(1260) K+)=-0.16±0.12±0.01. The first uncertainty quoted is statistical and the second is systematic. © 2008 The American Physical Society.