论文标题

在手性有效野外理论中,杜特隆电荷和四极型的高准确计算

High-accuracy calculation of the deuteron charge and quadrupole form factors in chiral effective field theory

论文作者

Filin, A. A., Möller, D., Baru, V., Epelbaum, E., Krebs, H., Reinert, P.

论文摘要

我们根据手性有效田间理论中得出的最新两种核电势和电荷密度运算符,对Deuteron电荷和四极型形式进行了全面分析。单核对电荷密度的贡献用质子和中子形式表示,用于采用最新的经验参数化。通过调整两核电密度操作员中的五阶短距离术语,以重现世界上的动量转移依赖性和四极管形式的依赖性,我们可以预测结构半径的值和deuteron的四倍矩的值:deuteron:$ r _ {\ rm _ {\ rm rm rm rm rm rm _ {\ rm rm rm} = 1.9729 = 1.9729 = 1.9729 {{\ 0.9729 {+et.9729 {{\ rm sTR -0.0012} \ \ text {fm},\ q_d = 0.2854 \ setack {+0.0038 \\ -0.0017} \ \ \ \ \ \ text {fm}^2。 $对我们的预测中的各种不确定性来源进行了全面的系统分析。遵循我们最近出版的物理中提倡的策略。莱特牧师。 124,082501(2020),我们采用了提取的结构半径以及准确的原子数据,用于Deuteron-Proton均值均方根电荷半径差异来更新中子电荷半径的确定,为此我们发现:$ r_n^2 = -0.105 = -0.105 \ setack {+0.005 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -0.00.006}。鉴于在$ q \ simeq 1-2.5 $ fm $^{ - 1} $的动量转移范围内观察到的Deuteron形式的快速融合,我们认为该中型能量域对核子形式的细节特别敏感,可用于测试不同的参数分析。

We present a comprehensive analysis of the deuteron charge and quadrupole form factors based on the latest two-nucleon potentials and charge density operators derived in chiral effective field theory. The single- and two-nucleon contributions to the charge density are expressed in terms of the proton and neutron form factors, for which the most up-to-date empirical parametrizations are employed. By adjusting the fifth-order short-range terms in the two-nucleon charge density operator to reproduce the world data on the momentum-transfer dependence of the deuteron charge and quadrupole form factors, we predict the values of the structure radius and the quadrupole moment of the deuteron: $r_{\rm str}=1.9729\substack{+0.0015\\ -0.0012}\ \text{fm},\ Q_d=0.2854\substack{+0.0038\\ -0.0017}\ \text{fm}^2. $ A comprehensive and systematic analysis of various sources of uncertainty in our predictions is performed. Following the strategy advocated in our recent publication Phys. Rev. Lett. 124, 082501 (2020), we employ the extracted structure radius together with the accurate atomic data for the deuteron-proton mean-square charge radii difference to update the determination of the neutron charge radius, for which we find: $r_n^2=-0.105\substack{+0.005\\ -0.006} \, \text{fm}^2$. Given the observed rapid convergence of the deuteron form factors in the momentum-transfer range of $Q \simeq 1-2.5$ fm$^{-1}$, we argue that this intermediate-energy domain is particularly sensitive to the details of the nucleon form factors and can be used to test different parametrizations.

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