利用具有非常规插入场的QCD求和规则计算核子张量荷  

Tensor Charge of the Nucleon from the QCD Sum Rule with Unconventional Interpolating Field

作　　者：曹泽新[1] 何汉新[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2000年第7期624-630,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金

摘　　要：利用外张量场下的QCD求和规则计算了核子张量荷 ,其中核子插入场的核子流算符取最一般形式或称为非常规型 ,计算包括至维度 8的项的贡献 .详细分析了不同核子插入场及张量磁化率对计算核子张量荷求和规则的影响 .计算表明 ,改变核子插入场及张量磁化率仍不能得到求和规则的稳定解 ,但如取最佳插入场的形式 ,对同位旋矢量和同位旋标量的求和规则解的稳定性有所改善 .给出了在通常的对核子“QCD求和规则窗口”标度下核子张量荷的平均值 .The tensor charges of the nucleon are calculated by using the QCD Sum Rules in the external tensor field,where the nucleon interpolating field(nucleon current operator)takes the most general form,i.e.the unconventional one . Calculation includes the terms up to demension 8. All possible effects on QCD sum rule calculations of tensor charges of the nucleon by changing interpolating field and tensor susceptibilities are analysed. The calculations show that the stable solution for QCD sum rules of tensor charges of the nucleon can not be obtained by changing interpolating field and tensor susceptibilities. However,the stable behavior of the solutions for the sum rules of isovector and isoscalar tensor charges may be improved when the interpolation field takes the best one. The tensor charges of the nucleon by taking average over the so called“sum rule window”are given.

关 键 词：张量荷 QCD求和规则 非常规则插入场 核子 

分 类 号：O572.2[理学—粒子物理与原子核物理]