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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2005, vol. 617, p. 141-149

Study of the baryon-antibaryon low-mass enhancements in charmless three-body baryonic B decays

Wang M. Z., Abe K., Abe K., Aihara H., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Bedny I., Bitenc U., Bizjak I., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Enari Y., Fang F., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Gorišek A., Haba J., Hayasaka K., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. K., Kim S. M., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar S., Kuo C. C., Kuo T. L., Kuzmin A., Kwon Y. J., Leder G., Lee S. E., Lee Y. J., Lesiak T., Li J., Lin S. W., Liventsev D., MacNaughton J., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Mizuk R., Moloney G. R., Nagamine T., Nagasaka Y., Nakano E., Nakao M.

The angular distributions of the baryon-antibaryon low-mass enhancements seen in the charmless three-body baryonic B decays B +→pp̄ K +, B 0→pp̄K S 0 and B 0→pΛ̄π - are reported. A quark fragmentation interpretation is supported, while the gluonic resonance picture is disfavored. Searches for the Θ + and Θ ++ pentaquarks in the relevant decay modes and possible glueball states G with 2.2 GeV/c 2<M pp̄<2.4 GeV/c 2 in the pp̄ systems give null results. We set upper limits on the products of branching fractions, Β(B 0→Θ +p̄) Β(Θ +→pK S 0)<2.3×10 -7, Β(B +→Θ ++p̄) Β(Θ ++→pK +)<9.1×10 -8, and Β(B +→GK +)B(G→pp̄)<4. 1×10 -7 at the 90% confidence level. The analysis is based on a 140 fb -1 data sample recorded on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e +e - collider. © 2005 Elsevier B.V. All rights reserved.