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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2011, vol. 106, p. -

Observation of Bs0→J/ψf0(980) and evidence for Bs0→J/ψf0(1370)

Li J., Aihara H., Arinstein K., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bhuyan B., Bozek A., Bračko M., Brovchenko O., Browder T. E., Chang P., Chen A., Chen P., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Cho K., Choi S. K., Choi Y., Dalseno J., Doležal Z., Drutskoy A., Eidelman S., Esen S., Feindt M., Gaur V., Gabyshev N., Garmash A., Golob B., Ha H., Haba J., Hara T., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Iwashita T., Julius T., Kang J. H., Kapusta P., Katayama N., Kawasaki T., Kichimi H., Kiesling C., Kim H. J., Kim H. O., Kim M. J., Kim S. K., Kim Y. J., Kinoshita K., Ko B. R., Kobayashi N., Korpar S., Križan P., Kuhr T., Kumar R., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee M. J., Lee S. H., Lim C. L., Liu C., Liventsev D., Louvot R., MacNaughton J., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Moll A.

We report the observation of Bs0→J/ψf0(980) and evidence for Bs0→J/ψf0(1370), which are CP eigenstate decay modes. These results are obtained from 121.4fb-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e +e- collider. We measure the branching fractions B(Bs0→J/ψf0(980);f0(980) →π+π-)=(1.16-0.19+0.31(stat)-0.17+0.15(syst)-0. 18+0.26(NBs(*)B̄s(*)))×10-4 with a significance of 8.4σ, and B(Bs0→J/ψf0(1370);f 0(1370)→π+π-)=(0.34-0.14+0.11(stat) -0.02+0.03(syst)-0.05+0.08(NBs(*)B̄s(*))) ×10-4 with a significance of 4.2σ. The last error listed is due to uncertainty in the number of produced Bs(*)B̄s(*) pairs. © 2011 American Physical Society.