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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2004, vol. 71, p. 031102-1

Measurement of the ratio B(B<sup>-</sup> → D*<sup>0</sup>K <sup>-</sup>)/B(B → D*<sup>0</sup>π<sup>-</sup>) and of the CP asymmetry of B<sup>-</sup> → D*<inf>CP+</inf><sup>0</sup>K <sup>-</sup> decays

Aubert B., Barate R., Boutigny D., Couderc F., Karyotakis Y., Lees J. P., Poireau V., Tisserand V., Zghiche A., Grauges-Pous E., 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., Kukartsev G., Lynch G., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Ronan M. T., Wenzel W. A., Barrett M., Ford K. E., Harrison T. J., Hart A. J., Hawkes C. M., Morgan S. E., Watson A. T., Fritsch M., Goetzen K., Held T., Koch H., Lewandowski B., Pelizaeus M., Schroeder T., Steinke M., Boyd J. T., Chevalier N., Cottingham W. N., Kelly M. P., Latham T. E., Wilson F. F., Cuhadar-Donszelmann T., Hearty C., Knecht N. S., Mattison T. S., McKenna J. A., Thiessen D., Khan A., Kyberd P., Teodorescu L., Blinov A. E., Blinov V. E., Druzhinin V. P., 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., Eschrich I., Kirkby D., Lankford A. J., Mandelkern M., Mommsen R. K., Roethel W., Stoker D. P., Buchanan C., Hartfiel B. L., Weinstein A. J R, Foulkes S. D.

We study the decays B<sup>-</sup> → D*<sup>0</sup>π <sup>-</sup> and B<sup>-</sup>→ D*<sup>0</sup>K<sup>-</sup>, where the D*<sup>0</sup> decays into D<sup>0</sup>π<sup>0</sup>, with the D<sup>0</sup> reconstructed in the CP-even (CP+) eigenstates K<sup>-</sup>K <sup>+</sup> and π<sup>-</sup>π<sup>+</sup> and in the (non-CP) channels K<sup>-</sup>π<sup>+</sup>, K <sup>-</sup>π<sup>+</sup>π<sup>+</sup>π<sup>-</sup>, and K <sup>-</sup>π<sup>+</sup>π<sup>0</sup>. Using a sample of about 123 × 10<sup>6</sup> BB̄ pairs, we measure the ratios of decay rates R*<inf>non-CP</inf> ≡ B(B<sup>-</sup> → D* <inf>non-CP</inf><sup>0</sup>K<sup>-</sup>)/B(B<sup>-</sup> → D*<inf>non-CP</inf><sup>0</sup>π<sup>-</sup>) = 0.086 ± 0.0040(stat)<inf>-0.0031</inf><sup>+0.0042</sup>(syst), and provide the first measurements of R*<inf>CP+</inf> ≡ B(B<sup>-</sup> → D*<inf>CP+</inf><sup>0</sup>K<sup>-</sup>)/B(B<sup>-</sup> → D*<inf>CP+</inf><sup>0</sup>π<sup>-</sup>) = 0.0086 ± 0.021(stat) ± 0.007(syst), and of the CP asymmetry A*<inf>CP+</inf> ≡ B(B<sup>-</sup> → D*<inf>CP+</inf><sup>0</sup>K <sup>-</sup>)-B(B<sup>+</sup> → D*<inf>CP+</inf><sup>0</sup>K <sup>+</sup>)/B(B<sup>-</sup> → D*<inf>CP+</inf><sup>0</sup>K <sup>-</sup>)+B(B<sup>+</sup> → D*<inf>CP+</inf><sup>0</sup>K <sup>+</sup>) = 0.10 ± 0.23(stat)<inf>-0.04</inf><sup>+0.03</sup>(syst). © 2005 The American Physical Society.