EVOLUTION OF WEINBERG GLUONIC CP-VIOLATION OPERATOR
EVOLUTION OF WEINBERG GLUONIC CP-VIOLATION OPERATOR
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DOI：
10.1103/physrevlett.64.1709
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发表时间：
1990-04-09
影响因子：
8.6
通讯作者：
YUAN, TC
中科院分区：
文献类型：
--
作者：
BRAATEN, E;LI, CS;YUAN, TC
计算了Weinberg纯胶子-6CP破坏算符的重整化群演化到QCD耦合常数的一阶，包括它与夸克色电偶极矩的混合.我们对夸克算符反常维度的计算结果与以前的几次计算一致。对于胶子算符，我们发现反常维度与先前的计算具有相同的量级但符号相反。这大大放宽了通过实验测量中子电偶极矩来扩展标准模型的限制。
The renormalization-group evolution of Weinberg’s purely gluonic dimension-6 CP-violating operator is computed to first order in the QCD coupling constant, including its mixing with the quark color electric dipole moment. Our result for the anomalous dimension of the quark operator agrees with several previous calculations. For the gluonic operator, we find the anomalous dimension to have the same magnitude but opposite sign as a previous calculation. This significantly relaxes the constraints imposed on extensions of the standard model by experimental measurements of the neutron electric dipole moment.