含单个重味夸克强子的扩展手征SU(3)夸克模型研究  

Study of Hadrons with Singly Heavy Flavor in the Extended Chiral SU(3) Quark Model

作　　者：满都呼[1] 张丹[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021

出　　处：《内蒙古大学学报（自然科学版）》2014年第1期17-25,共9页Journal of Inner Mongolia University：Natural Science Edition

基　　金：内蒙古自治区自然科学基金(面上)项目(2010MS0101)

摘　　要：依据QCD基本性质建立的扩展手征SU(3)夸克模型可以很好地解决轻强子方面的问题,本文将该模型应用到重味领域,通过变分法计算自旋为0和1的基态含单个重味夸克介子D、Ds、B、Bs,与自旋为1/2和3/2的基态含单个重味夸克重子ΛQ、ΣQ、ΩQ、ΞQ(其中Q代表c或b夸克)的质量,得到一些初步的结果.当含单个重味夸克介子质量的数值结果基本符合实验值时,实验上已发现的重味重子ΛQ、ΣQ、ΩQ、Σ*Q、Ω*c质量的理论值与相应实验值和其它理论方法的结论也基本符合,除了ΞQ、Ξc*的计算值偏大;实验上未发现的重味重子Ξ*b,Ω*b质量的理论预测值与其它理论方法所得结果偏差不大.同时,简要分析了强子内部的相互作用.The extended chiral SU（3） quark model based on the properties of the quantum chro- modynamics（QCD） is very successful in the light hadrons fields,and is applied to the hadrons with singly heavy flavor. The masses of the S=1 and S=0 ground-state mesons D,Ds,B and Bs and the masses of the S=1/2 and S=3/2 ground--state baryons ∧Q,∑Q,ΩQand ЕQ（the Q means c or b quark） are calculated by using the methed of variations,and some interesting results are obtained. With the masses of the mesons fitting the corresponding known experimental data, the calculated re- sults of established baryons ∧Q,∑Q,ΩQ,∑Q^＊ and Ωc^＊ are reasonably consistent with experimental val-ues and conclusions from other theoretical methods, except that the results of ЕQ and Еc^＊ are some-what heavier. The predicted masses of the ground--state baryons Еb^＊ and Ωb^＊ ,which have not been observed before, are obtained now, and they are close to those from other theoretical approaches. Meanwhile,the interactions inside the hadrons are briefly discussed.

关 键 词：扩展手征SU(3)夸克模型 重味介子 重味重子 

分 类 号：O413.3[理学—理论物理]