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

Observation of B+→pΛ̄π+π- at Belle

Chen P., Wang M. Z., Aihara H., Bakich A. M., Balagura V., Bhardwaj V., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chen A., Cheon B. G., Cho I. S., Choi Y., Dalseno J., Danilov M., Dash M., Eidelman S., Gabyshev N., Goldenzweig P., Golob B., Han B. Y., Hara T., Hayashii H., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Itoh R., Iwasaki Y., Kang J. H., Katayama N., Kawai H., Kichimi H., Kim H. J., Kim H. O., Kim Y. I., Kim Y. J., Ko B. R., Korpar S., Križan P., Krokovny P., Kwon Y. J., Kyeong S. H., Lee M. J., Lee S. H., Liu C., Liu Y., Liventsev D., Louvot R., Matyja A., McOnie S., Miyata H., Miyazaki Y., Mizuk R., Nakano E., Nakao M., Nishida S., Ogawa S., Ohshima T., Okuno S., Pakhlova G., Park C. W., Park H. K., Peak L. S., Pestotnik R., Peters M., Petrič M., Piilonen L. E., Poluektov A., Reisert B., Sahoo H., Sakai Y., Schneider O., Senyo K., Sevior M. E., Shapkin M., Shebalin V., Shen C. P., Shiu J. G., Simon F., Smerkol P., Sokolov A., Solovieva E., Starič M., Sumiyoshi T., Teramoto Y.

We study charmless B+ meson decays to the pΛ̄π+π- final state using a 605fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. There are significant signals found with the pΛ̄ mass peaking near threshold. The observed branching fraction for nonresonant B+→pΛ̄π+π - is (5.92-0.84+0.88(stat)±0.69(syst))×10-6 with a significance of 9.1 standard deviations. We also observe the intermediate three-body decay B+→pΛ̄ρ0 with a branching fraction of (4.78-0.64+0.67(stat) ±0.60(syst))×10-6 and a significance of 9.5 standard deviations, and find a hint of a B+→pΛ̄f2(1270) signal. No other intermediate three-body decay is found in this study. © 2009 The American Physical Society.