论文标题
与显式$δ$自由度的协变性重手性扰动理论中的核子极化
Nucleon polarizabilities in covariant baryon chiral perturbation theory with explicit $Δ$ degrees of freedom
论文作者
论文摘要
我们计算手性扰动理论中实施$δ$ -Full（$δ$ - 否）的各种核子极化，以在小规模（手感）扩展中订购$ε^3 + q^4 $（$ q^4 $）。通过使用扩展的质量壳重归化方案，使用$χ$ pt的协方差公式进行计算。除了用于固定某些低能常数的值的自旋偶极极化性外，我们对核子极化的结果是纯预测。我们将计算与可用的实验数据和其他理论结果进行比较。分析了对核子极化能力的有效野外理论描述中对$δ$自由度的显式处理的重要性。我们还研究了$ 1/m $扩展的收敛性，并分析了重 - 巴里元方法的核能极化效率。
We compute various nucleon polarizabilities in chiral perturbation theory implementing the $Δ$-full ($Δ$-less) approach up to order $ε^3 + q^4$ ($q^4$) in the small-scale (chiral) expansion. The calculation is carried out using the covariant formulation of $χ$PT by utilizing the extended on-mass shell renormalization scheme. Except for the spin-independent dipole polarizabilities used to fix the values of certain low-energy constants, our results for the nucleon polarizabilities are pure predictions. We compare our calculations with available experimental data and other theoretical results. The importance of the explicit treatment of the $Δ$ degree of freedom in the effective field theory description of the nucleon polarizabilities is analyzed. We also study the convergence of the $1/m$ expansion and analyze the efficiency of the heavy-baryon approach for the nucleon polarizabilities.
