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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 94, p. -

Search for radiative penguin decays B+ → ρ+γ,B0 → ρ0γ, and B0 → ωγ

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 Y. G., Kukartsev G., Lynch G., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Ronan M. T., Shelkov V. G., 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., 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 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., Foulkes S. D., Gary J. W.

A search for the decays B → ρ(770)γ and B0 → ω(782)γ is performed on a sample of 211 × 106 Y(45) → BB̄ events collected by the BABAR detector at the SLAC PEP-II asymmetric-energy e+ e- storage ring. No evidence for the decays is seen. We set the following limits on the individual branching fractions: ℬ(B+ → rho;+γ] < 1.8 × 10-6, ℬ(B0 → ρ0γ < 0.4 × 10-6, and Bscr;(B0 → ωγ) < 1.0 × 10-6 at the 90% confidence level. We use the quark model to limit the combined branching fraction Bscr;̄[B → (ρ/ω) γ] < 1.2 × 10-6, from which we determine a constraint on the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |Vtd|/ |Vts|. © 2005 The American Physical Society.