摘要
利用北京谱仪（ＢＥＳ）获取的２×１０５Ｊ／事例，首次给出Ｊ／能区Ｋ±、Ｋｓ、ｐ．Ｋ，Ｋ、等介子和（１３８５）等重子的单举产额，并与理论模型进行比较，结果表明唯象模型向低能区的延拓是可行的。同时得到Ｊ／能区的奇异抑制因子ｓ／ｕ－０．３，自旋抑制因子Ｖ／（Ｖ＋Ｐ）－０．３－０．５，与ＡＲＧＵＳ在能区的测量结果一致，说明ＳＵ（６）对称性破缺在Ｊ／能区也是存在的。
The mean multiplicities of mesons and baryons p、 (1385) are measured for the first time in J/ region with 200,000 J/ events collected by the BES detector. The results are compatible with LUND and Shandong phenomenological models. Based on the experimental results, the strangeness suppression factor s / u and spin suppression factor V / (V + P) are calculated to be - 0.3 and - 0.3- 0.5 respectively, in good agreement with those given by ARGUS Collaboration in region. This indicates that the SU(6) breaking is consistent in the energy region from J / to .
出处
《高能物理与核物理》
CSCD
北大核心
1997年第11期961-969,共9页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
中国科学院重大基础研究项目
关键词
单举产生
不变质量
唯象模型
强子
J/ψ事例
inclusive production, event selection, invariant mass, phenome- nological model.
