We report a measurement of the Ξc+ and Ξc0 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(Ξc0 → pK-k -π+)/Γ(Ξc0 → Ξ-π+) = 0.33 ± 0.03 ± 0.03, with improved precision, and measure Γ(Ξc+ → p KS0KS0) /Γ(Ξc+ → Ξ -π+π+) = 0.087 ± 0.016 ± 0.014, Γ(Ξc0 ΛK -π+)/Γ(Ξc0 → Ξ-π+) = 1.07 ± 0.12 ± 0.07 and Γ(Ξc0 → ΛKS 0)/Γ(Ξc0 → Ξ -π+) = 0.21 ± 0.02 ± 0.02 for the first time.
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2005 Jan 13|
Bibliographical noteFunding Information:
We thank the KEKB group for the excellent operation of the accelerator, the KEK Cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the National Institute of Informatics for valuable computing and Super-SINET network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Education, Science and Training; the National Science Foundation of China under contract No. 10175071; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea and the CHEP SRC program of the Korea Science and Engineering Foundation; the Polish State Committee for Scientific Research under contract No. 2P03B 01324; the Ministry of Science and Technology of the Russian Federation; the Ministry of Education, Science and Sport of the Republic of Slovenia; the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics