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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2003, vol. 91, p. 021801/1-021801/4

Observation of the decay B± → π±π0, study of B± → K±π0, and search for B0 → π0 π0

Aubert B., Barate R., Boutigny D., Gaillard J. M., Hicheur A., Karyotakis Y., Lees J. P., Robbe P., Tisserand V., Zghiche A., 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 AW, Breon A. B., Brown D. N., Button-Shafer J., Cahn R. N., Charles E., Gill M. S., Gritsan A. V., Groysman Y., Jacobsen R. G., Kadel R. W., Kadyk J., Kerth L. T., Kolomensky Y. G., Kral J. F., Kukartsev G., LeClerc C., Levi M. E., Lynch G., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Romosan A., Ronan M. T., Shelkov V. G., Telnov A. V., Wenzel W. A., Harrison T. J., Hawkes C. M., Knowles D. J., Penny RC, Watson A. T., Watson N. K., Deppermann T., Goetzen K., Koch H., Lewandowski B., Pelizaeus M., Peters K., Schmuecker H., Steinke M., Barlow N. R., Bhimji W., Boyd J. T., Chevalier N., Clark P. J., Cottingham W. N., Mackay C., Wilson F. F., Hearty C., Mattison T. S., McKenna J. A., Thiessen D., Kyberd P., McKemey A. K., Blinov V. E., Bukin A. D., 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., Chao M., Kirkby D., Lankford A. J., Mandelkern M., McMahon S., Mommsen R. K., Roethel W., Stoker D. P., Buchanan C., Hadavand H. K., Hill E. J.

BABAR is a solenoidal detector optimized for the asymmetric-energy beams at PEP-II and is described in detail. As such, charged particle (track) momenta are measured with a 5-layer double-sided silicon vertex tracker and a 40-layer drift chamber (DCH) inside a 1.5 T superconducting solenoidal magnet. This paper reports on an observation of the decays B±→π±π0 and B±→K±π0, a measurement of their CP-violating charge asymmetries, and a search for the decay B0→π0π0, using (87.9±1.0)×106 BB̄ pairs collected with the BABAR detector.