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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2004, vol. 69, p. -

Measurement of sin 2/3 with hadronic and previously unused muonic J/ψ decays

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 A. W., Breon A. B., Brown D. N., Button-Shafer J., Cahn R. N., Charles E., Day C. T., Gill M. S., Gritsan A. V., Groysman Y., Jacobsen R. G., Kadel R. W., Kadyk J., Kerth L. T., Kolomensky Yu 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., Ford K., Harrison T. J., Hawkes C. M., Knowles D. J., Morgan S. E., Penny R. C., Watson A. T., Watson N. K., Goetzen K., Held T., Koch H., Lewandowski B., Pelizaeus M., Peters K., Schmuecker H., Steinke M., Boyd J. T., Chevalier N., Cottingham W. N., Kelly M. P., Latham T. E., Mackay C., Wilson F. F., Abe K., Cuhadar-Donszelmann T., 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., Bruinsma M., Chao M., Kirkby D., Lankford A. J., Mandelkern M., Mommsen R. K.

We report a measurement of the CP-violation parameter sin 2β with B0J/ψKS 0 decays in which the J/ψ decays to hadrons or to muons that do not satisfy our standard identification criteria. With a sample of 88 million BB̄ events collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC, we reconstruct 100±17 such events, with J/ψ→π-π -π0 being the most prevalent, and measure sin2β=1.56± 0.42(stat)±0.21(syst). © 2004 The American Physical Society.