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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 76, p. -

Study of B+→pΛ̄γ, pΛ̄π0 and B0→pΛ̄π-

Wang M. Z., Lee Y. J., Abe K., Adachi I., Aihara H., Anipko D., Aushev T., Bahinipati S., Bakich A. M., Bedny I., Belous K., Bizjak I., Blyth S., Bondar A., Bračko M., Browder T. E., Chang M. C., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Choi Y. K., Cole S., Dalseno J., Dash M., Eidelman S., Fratina S., Gokhroo G., Ha H., Haba J., Hayasaka K., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Joshi N., Kah D. H., Kang J. H., Katayama N., Kawasaki T., Kichimi H., Kim Y. J., Kinoshita K., Križan P., Krokovny P., Kumar R., Kuo C. C., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Liventsev D., Mandl F., Matsumoto T., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nakao M., Nishida S., Nitoh O., Ohshima T., Okuno S., Onuki Y., Ostrowicz W., Ozaki H., Pakhlov P., Pakhlova G., Palka H., Park C. W., Park H., Park K. S., Pestotnik R., Piilonen L. E., Sakai Y.

We study the following charmless baryonic three-body decays of B mesons: B+→pΛ̄γ, B+→pΛ̄π0, and B0→pΛ̄π-. The partial branching fractions as a function of the baryon-antibaryon mass and the polar angle distributions of the proton in the baryon-antibaryon system are presented. This study includes the first observation of B+→pΛ̄π0, which is measured to have a branching fraction of (3.00-0.53+0.61±0.33)×10-6. We also set upper limits on branching fractions of the two-body decays B0→pΣ̄ *-, B0→Δ0Λ̄, B+→pΣ̄*0, and B+→Δ+Λ̄ at the 90% confidence level. These results are obtained from a 414fb-1 data sample collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. © 2007 The American Physical Society.