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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 82, p. -

Search for Bs0 → hh decays at the Y5S resonance

Peng C. C., Chang P., Adachi I., Aihara H., Aushev T., Aziz T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chao Y., Chen A., Chen K. F., Chen P., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Das A., Dash M., Drutskoy A., Dungel W., Eidelman S., Gabyshev N., Goldenzweig P., Golob B., Ha H., Haba J., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Joshi N. J., Julius T., Kang J. H., Kawasaki T., Kim H. J., Kim H. O., Kim J. H., Kim M. J., Kim S. K., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kwon Y. J., Kyeong S. H., Lee M. J., Lee S. H., Li J., Limosani A., Liu C., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Nakao M., Nakazawa H., Natkaniec Z., Neubauer S., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L.

We have searched for Bs0→hh decays, where h stands for a charged or neutral kaon, or a charged pion. These results are based on a 23.6fb-1 data sample collected with the Belle detector on the Υ(5S) resonance at the KEKB asymmetric-energy e+e- collider, containing 1.25×106 Bs(*)B̄s(*) events. We observe the decay Bs0→K +K- and measure its branching fraction, B(Bs0→K +K-)=[3.8-0.9+1.0(stat)±0.5(syst)±0.5(f s)]×10-5. The first error is statistical, the second is systematic, and the third error is due to the uncertainty in the Bs0 production fraction in e+e-→bb̄ events. No significant signals are seen in other decay modes, and we set upper limits at the 90% confidence level: B(Bs0→K-π+)<1.2×10-5, B(Bs0→π+π-)<2.6×10-5, and B(Bs0→K0K̄0) <6.6×10-5. © 2010 The American Physical Society.