Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 71, p. 1-7

Study of the B<sup>-</sup> → J/ΨK <sup>-</sup>π<sup>+</sup>π<sup>-</sup> decay and measurement of the B <sup>-</sup> → X(3872)K<sup>-</sup> branching fraction

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., Lynch G., Merchant A. M., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Ronan M. T., Shelkov V. G., Wenzel W. A., Ford K., Harrison T. J., Hawkes C. M., Morgan S. E., Watson A. T., 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., Cuhadar-Donszelmann T., Hearty C., Knecht N. S., Mattison T. S., McKenna J. A., Thiessen D., Khan A., 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 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., Gary J. W., Shen B. C.

We study the decay B<sup>-</sup> → J/ΨK <sup>-</sup>π<sup>+</sup>π<sup>-</sup> using 117×10<sup>6</sup> BB̄ events collected at the Y(4S) resonance with the BABAR detector at the PEP-II e<sup>+</sup>e<sup>-</sup> asymmetric-energy storage ring. We measure the branching fractions ℬ (B<sup>-</sup> → J/ΨK <sup>-</sup>π<sup>+</sup>π<sup>-</sup>) = (116±7(stat.) ±9(syst.))×10<sup>-5</sup> and ℬ (B<sup>-</sup> → X(3872)K<sup>-</sup>) × ℬ (X(3872) → J/Ψπ<sup>+</sup>π <sup>-</sup>) = (1.28±0.41)×10<sup>-5</sup> and find the mass of the X(3872) to be 3873.4±1.4 MeV/c<sup>2</sup>. We search for the h <inf>c</inf> narrow state in the decay B<sup>-</sup> → h<inf>c</inf>K <sup>-</sup>, h<inf>c</inf> → J/Ψπ<sup>+</sup>π<sup>-</sup> and for the decay B<sup>-</sup> → J/ΨD<sup>0</sup>π<sup>-</sup>, with D<sup>0</sup> → K<sup>-</sup>π<sup>+</sup>. We set the 90% C.L. limits ℬ(B<sup>-</sup> → h<inf>c</inf>K<sup>-</sup>) × ℬ(h <inf>c</inf> → J/Ψπ<sup>+</sup>π<sup>-</sup>)<3. 4×10<sup>-6</sup> and ℬ(B<sup>-</sup> → J/ΨD <sup>0</sup>π<sup>-</sup>)<5.2×10<sup>-5</sup>. © 2005 The American Physical Society.