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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, vol. 80, p. -

Measurements of charmless hadronic b→s penguin decays in the π+π-K+π- final state and first observation of B0→ρ0K+π-

Kyeong S. H., Kwon Y. J., Adachi I., Aihara H., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang M. C., Chao Y., Chen A., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Dalseno J., Das A., Drutskoy A., Dungel W., Eidelman S., Gabyshev N., Goldenzweig P., Ha H., Haba J., Han B. Y., Hara T., Hasegawa Y., Hayasaka K., Hayashii H., Hoshi Y., Hyun H. J., Inami K., Ishikawa A., Itoh R., Iwasaki M., Joshi N. J., Kah D. H., Kang J. H., Kapusta P., Katayama N., Kawasaki T., Kim H. O., Kim J. H., Kim Y. I., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., Križan P., Kumar R., Lee M. J., Lesiak T., Li J., Liu C., Liu Y., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Nagasaka Y., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H., Park H. K., Pestotnik R., Piilonen L. E., Sahoo H., Sakai K., Sakai Y., Schneider O., Schümann J., Schwanda C., Schwartz A. J., Sekiya A., Senyo K.

We report measurements of charmless hadronic B0 decays into the π+π-K+π- final state. The analysis uses a sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at the resonance. The decay B0→ρ0K+π- is observed for the first time; the significance is 5.0σ and the corresponding partial branching fraction for MKπ(0.75,1.20)GeV/c2 is [2.8±0.5(stat) ±0.5(syst)]×10-6. We also obtain the first evidence for B0→f0(980)K+π- with 3.5σ significance and for B0→π+π- K*0 with 4.5σ significance. For the two-body decays B0→ρ0K*0 and B0→f0(980)K*0, the significances are 2.7σ and 2.5σ, respectively, and the upper limits on the branching fractions are 3.4×10-6 and 2.2×10-6 at 90% confidence level. © 2009 The American Physical Society.