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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 76, p. -

Measurements of exclusive Bs0 decays at the Υ(5S) resonance

Drutskoy A., Abe K., Adachi I., Aihara H., Anipko D., Bakich A. M., Barberio E., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bračko M., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Dalseno J., Danilov M., Dash M., Dragic J., Eidelman S., Fratina S., Gabyshev N., Golob B., Ha H., Haba J., Hara T., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kim H. J., Kim H. O., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee M. J., Limosani A., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Matsumoto T., McOnie S., Mitaroff W., Miyabayashi K., Miyata H., Miyazaki Y., Moloney G. R., Nakano E., Nakao M., Natkaniec Z., Nishida S., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Onuki Y., Ozaki H., Pakhlov P., Pakhlova G., Pestotnik R., Piilonen L. E., Sakai Y., Satoyama N., Schietinger T., Schneider O., Schümann J.

Several exclusive Bs0 decays are studied using a 1.86fb-1 data sample collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. In the Bs0→Ds-π+ decay mode we find 10 Bs0 candidates and measure the corresponding branching fraction. Combining the Bs0→Ds(*)-π+, Bs0→Ds(*)-ρ+, Bs0→J/ψ, and Bs0→J/ψη decay modes, a significant Bs0 signal is observed. The ratio σ(e+e-→Bs*B̄s*)/σ(e+e-→Bs(*) B̄s(*))=(93-9+7±1)% is obtained at the Υ(5S) energy, indicating that Bs0 meson production proceeds predominantly through the creation of Bs*B̄s* pairs. The Bs0 and Bs* meson masses are measured to be M(Bs0)=(5370±1±3)MeV/c2 and M(Bs*)= (5418±1±3)MeV/c2. Upper limits on the Bs0→γγ, Bs0→ γ, Bs0→K+K-, and Bs0→Ds(*)+Ds(*)- branching fractions are also reported. © 2007 The American Physical Society.