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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 99, p. -

Observation of B meson decays to b1π and b1K

Aubert B., Bona M., Boutigny D., Karyotakis Y., Lees J. P., Poireau V., Prudent X., Tisserand V., Zghiche A., Tico J. Garra, 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., Pegna D. Lopes, 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., Held T., Koch H., Pelizaeus M., Schroeder T., Steinke M., 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., 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.

We present the results of searches for decays of B mesons to final states with a b1 meson and a charged pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 382×106 BB̄ pairs produced in e+e- annihilation. The results for the branching fractions are, in units of 10-6, B(B+→b10π+)=6.7±1.7±1.0, B(B+→b10K+)=9.1±1.7±1.0, B(B0→b1π±)=10. 9±1.2±0.9, and B(B0→b1-K+)=7.4±1.0±1.0, with the assumption that B(b1→ωπ)=1. We also measure charge and flavor asymmetries Ach(B+→b10π+)=0.05±0.16±0.02, Ach(B+→b10K+)=-0.46±0.20±0.02, Ach(B0→b1π±)=- 0.05±0.10±0.02, C(B0→b1π±)=-0.22±0. 23±0.05, ΔC(B0→b1π±)=-1.04±0.23±0.08, and Ach(B0→b1-K+)=-0.07±0.12±0.02. The first error quoted is statistical, and the second systematic. © 2007 The American Physical Society.