激发态夸克传播子对中子电荷形状因子的影响分析
Analysis of excited quark propagator effects on neutron charge form factor
摘要：
在考虑夸克传播子基态和激发态的微扰手征夸克模型（PCQM）中，研究了中子的电荷形状因子和电荷半径。根据预先确定的基态夸克波函数提取类Cornell势，并通过用提取的PCQM势数值求解Dirac方程来导出激发夸克态。结果表明，夸克激发态的贡献对中子的电荷形状因子和电荷半径有很大的影响，夸克传播子中加入激发态后，总的结果得到了显著的改善，提高了近4倍.理论PCQM结果发现，包括地面和激发夸克传播子，在最近的格点量子色动力学值在约130 MeV的π介子质量符合得很好。
英文摘要：
The charge form factor and charge radius of neutron are investigated in the perturbative chiral quark model (PCQM) with considering both the ground and excited states in the quark propagator. A Cornell-like potential is extracted in accordance with the predetermined ground state quark wavefunction, and the excited quark states are derived by solving the Dirac equation with the extracted PCQM potential numerically. The study reveals that the contributions of the excited quark states are considerably influential in the charge form factor and charge radius of neutron as expected, and the total results are significantly improved and increased by nearly four times by including the excited states in the quark propagator. The theoretical PCQM results are found, including the ground and excited quark propagators, in good agreement with the recent lattice QCD values at pion mass of about 130 MeV.
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