Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2005, vol. 605, p. 237-246

Measurement of masses and branching ratios of Ξc + and Ξc 0 baryons

Lesiak T., Abe K., Abe K., Adachi I., Aihara H., Asano Y., Bahinipati S., Bakich A. M., Bay A., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Eidelman S., Eiges V., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Haba J., Hayasaka K., Hazumi M., Hinz L., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kinoshita K., Korpar S., Krokovny P., Kumar S., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lin S. W., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyata H., Moloney G. R., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H., Park H., Park K. S., Parslow N., Peak L. S., Piilonen L. E., Rozanska M., Sagawa H., Sakai Y., Sato N., Schietinger T., Schneider O.

We report a measurement of the Ξc + and Ξc 0 baryon masses, and the branching ratios for various Ξc decays, using 140 fb-1 of data collected by the Belle experiment at the KEKB e+e- collider. The mass splitting mΞc0 - mΞc+ is found to be 2.9 ± 0.5 MeV/c2; this measurement is three times as precise as the current world average. We measure the branching ratios Γ(Ξc + → ΛK-π+π+)/ Γ(Ξc + → Ξ -π+π+) = 0.32 ± 0.03 ± 0.02 and Γ(Ξc 0 → pK-k -π+)/Γ(Ξc 0 → Ξ-π+) = 0.33 ± 0.03 ± 0.03, with improved precision, and measure Γ(Ξc + → p KS 0KS 0) /Γ(Ξc + → Ξ -π+π+) = 0.087 ± 0.016 ± 0.014, Γ(Ξc 0 ΛK -π+)/Γ(Ξc 0 → Ξ-π+) = 1.07 ± 0.12 ± 0.07 and Γ(Ξc 0 → ΛKS 0)/Γ(Ξc 0 → Ξ -π+) = 0.21 ± 0.02 ± 0.02 for the first time. © 2004 Elsevier B.V. All rights reserved.