赝标介子η,η'和非(q)介子的混合研究  

Study on Mixing of Pseudoscalar Mesons η,η＇and Non-q Meson

作　　者：方建[1] 郁宏[1] 沈齐兴[1] 

机构地区：[1]中国科学院高能物理研究所,北京100039

出　　处：《高能物理与核物理》2000年第3期190-195,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金;中国科学院基金

摘　　要：利用包含η，η＇的一些辐射跃迁和它们的双光子衰变过程和某些Ｊ／ψ→Ｐ ＋Ｖ（赝标介子和矢量介子）电磁过程的最新实验数据，对赝标介子η，η’和非 （ｑ，）同位旋标量味单态（如 ι／η（１４４０）的混合问题进行了研究．用最小二乘法 拟合两种方案的混合参数，发现若仅考虑η和η＇的混合，则拟合结果不够好． 若考虑η，η’和此非（ｑ）介子（以后用ι表示）的混合，则拟合结果比较好．其结 果表明η＇必混有少量非（ｑ）成份，而。中也混有一定的（ｑ）成份．The data of radiative decays involving η, η＇ and their two-photon decay process and some electromagnetic processes of the J/ψ-P + V (Pseudoscalar and Vector mesons) have been used to study the admixture of pseudoscalar mesons η,η＇ and non-q isoscalar flavor singlet (such as ι/η (1440) ). The 'mixing parameters of two schemes are fitted by using the method of least Squares. If we only consider the mixing of η and η＇ the fitting result is not good. If the admixture of η, η＇ and the non-qq mesons (represented by ι later on) has been considered the result is better. The conclusion is that the η＇ may contain a few non-qq component and ι has some qq component.

关 键 词：胶球 混合 最小二乘法 赝标介子 

分 类 号：O572[理学—粒子物理与原子核物理]