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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2008, vol. 659, p. 80-86

Study of the decay mechanism for B+ → p over(p, ̄) K+ and B+ → p over(p, ̄) π+

Wei J. T., Wang M. Z., Adachi I., Aihara H., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Choi Y. K., Cole S., Danilov M., Dash M., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hsiung Y. B., Hyun H. J., Iijima T., Ikado K., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee S. E., Lesiak T., Lin S. W., Liu Y., Liventsev D., Mandl F., Matsumoto T., Matyja A., McOnie S., Medvedeva T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Nagasaka Y., Nakano E., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G.

We study the characteristics of the low mass p over(p, ̄) enhancements near threshold in the three-body decays B+ → p over(p, ̄) K+ and B+ → p over(p, ̄) π+. We observe that the proton polar angle distributions in the p over(p, ̄) helicity frame in the two decays have the opposite polarity, and measure the forward-backward asymmetries as a function of the p over(p, ̄) mass for the p over(p, ̄) K+ mode. We also search for the intermediate two-body decays, B+ → over(p, ̄) Δ+ + and B+ → p over(Δ, ̄)0, and set upper limits on their branching fractions. These results are obtained from a 414   fb-1 data sample that contains 449 × 106 B over(B, ̄) events collected near the Υ{hooked} (4 S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. © 2007 Elsevier B.V. All rights reserved.