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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. -

Observation of B + ∧ ∧K +

Lee Y. J., Wang M. Z., Abe K., Abe K., Abe T., Aihara H., Asano Y., Aulchenko V., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Ban Y., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Guo R., Haba J., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim J. H., Kim S. K., Koppenburg P., Korpar S., Krokovny P., Kuzmin A., Kwon Y. J., Lee S. H., Lesiak T., Li J., Lin S. W., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyabayashi K., Miyata H., Mizuk R., Mori T., Nagamine T., Nagasaka Y., Nakadaira T., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okabe T., Okuno S.

The observation of the hyperonic B + → λλ̄K + decay was presented. It was found that the rate of a charmless B decay was comparable to that of other charmless three-body baryonic modes. It was also found that the invariant mass of the λλ̄ system had a prominent near-threshold peak. The observed results show that the measurement achieved has the first observation of a meson decay to a hyperon pair.