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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 98, p. -

Measurements of CP-violating asymmetries in B0→a1±(1260)π decays

Aubert B., Bona M., Boutigny D., Karyotakis Y., Lees J. P., Poireau V., Prudent X., 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., 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., Pripstein M., Roe N. A., Ronan M. T., Tackmann K., Wenzel W. A., Del Amo Sanchez P., Barrett M., 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 Yu I., Solodov E. P., Todyshev K. Yu, Bondioli M., Bruinsma M., Chao 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., Hill E. J., Paar H. P., Rahatlou S., Sharma V.

We present measurements of CP-violating asymmetries in the decay B0→a1±(1260)π with a1±(1260) →ππ±π±. The data sample corresponds to 384×106 BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We measure the CP-violating asymmetry ACPa1π=-0.07±0. 07±0.02, the mixing-induced CP violation parameter Sa1π=0.37±0. 21±0.07, the direct CP violation parameter Ca1π=-0.10±0. 15±0.09, and the parameters ΔCa1π=0.26±0.15±0.07 and ΔSa1π=-0.14±0.21±0.06. From these measured quantities we determine the angle αeff=78.6°±7.3°. © 2007 The American Physical Society.