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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 78, p. -

Measurement of B0→π+π-π+π- decays and search for B0→ρ0ρ0

Chiang C. C., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Bedny I., Bhardwaj V., Bitenc U., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Dungel W., Eidelman S., Gabyshev N., Goldenzweig P., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Korpar S., Krizan P., Krokovny P., Kumar R., Kwon Y. J., Kyeong S. H., Lange J. S., Lee J. S., Lee S. E., Li J., Limosani A., Lin S. W., Liu C., Liventsev D., Mandl F., Matyja A., McOnie S., Miyata H., Mizuk R., Mori T., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H., Park H. K., Peak L. S.

We report on a search for the decay B0→ρ0ρ0 and other charmless modes with a π+π-π+π- final state, including B0→ρ0π+π-, nonresonant B0→4π±, B0→ρ0f0(980), B0→f0(980)f0(980) and B0→f0(980)π+π-. These results are obtained from a data sample containing 657×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We set an upper limit on B(B0→ρ0ρ0) of 1.0×10-6 at the 90% confidence level (C.L.). From our B0→ρ0ρ0 measurement and an isospin analysis, we determine the Cabibbo-Kobayashi-Maskawa phase 2 to be 91.7±14.9 degrees. We find excesses in B0→ρ0π+π- and nonresonant B0→4π± with 1.3σ and 2.5σ significance, respectively. The corresponding branching fractions are less than 12.0×10-6 and 19.3×10-6 at the 90% C.L. In addition, we set 90% C.L. upper limits as follows: B(B0→ρ0f0(980))<0.3×10-6, B(B0→f0(980)f0(980))<0.1×10-6, and B(B0→f0(980)π+π-) <3.8×10-6. © 2008 The American Physical Society.