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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2004, vol. 70, p. 011101-1

Branching fraction measurements of B → ηcK decays

Aubert B., Barate R., Boutigny D., Couderc F., Gaillard J. M., Hicheur A., Karyotakis Y., Lees J. 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., Kukartsev G., LeClerc C., Levi M. E., Lynch G., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Ronan M. T., Shelkov V. G., Telnov A. V., Wenzel W. A., Ford K., Harrison T. J., Hawkes C. M., Morgan S. E., Watson A. T., Watson N. K., Fritsch M., Goetzen K., Held T., Koch H., Lewandowski B., Pelizaeus M., Steinke M., Boyd J. T., Chevalier N., Cottingham W. N., Kelly M. P., Latham T. E., Wilson F. F., Abe K., Cuhadar-Donszelmann T., Hearty C., Mattison T. S., McKenna J. A., Thiessen D., Kyberd P., Teodorescu L., Blinov V. E., Bukin A. D., Druzhinin V. P., Golubev V. B., Ivanchenko V. N., Kravchenko E. A., Onuchin A. P., Serednyakov S. I., Skovpen Y. 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., Gary J. W.

We study the decays B+ → ηcK+ and B0 → ηcK0, where the ηc is reconstructed in the KS 0K ±π∓ and K+K- π0 decay modes. Results are based on a sample of 86 B B̄ pairs collected with the BABAR detector at the SLAC e+e- B Factory. We measure the product of branching fractions B(B+ → ηcK+) ×B(ηc→KK̄π)= (7.40±0.50±0.70)×10-5 and B(B 0→ηcK0) ×B(ηc→KK̄π)=(6.48±0.85±0.71) ×10-5, where the first error is statistical and the second is systematic, In addition, we search for B → ηcK events with ηc→2(K+K-) and ηc→ φφ and determine the ηc decay branching fraction ratios B(ηc →(K+K-)) /B(ηc→KK̄π)=(2.3±0.7±0.6) ×10-2 and B(ηc→φφ) /B(ηc→KK̄π)=(5.5±1.4±0.5) ×10-2.