Electromagnetic self-energy contribution to M(p)-M(n) and the isovector nucleon magnetic polarizability.
Electromagnetic self-energy contribution to M(p)-M(n) and the isovector nucleon magnetic polarizability.
复制标题
电磁自能对 M(p)-M(n) 和等矢量核子磁极化率的贡献。
DOI：
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发表时间：
2012
影响因子：
8.6
通讯作者：
G. Miller
中科院分区：
文献类型：
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作者：
A. Walker;C. Carlson;G. Miller
我们更新了对QED中的前导级有效的等矢量核子电磁自能的确定方法。一个技术上的疏忽，在文献中有关的弹性贡献Cottingham的公式被纠正，和现代知识的结构功能，以精确地确定非弹性的贡献。我们发现δM（p-n）（γ）= 1.30（03）（47） 兆电子伏最大的不确定性来自色散分析中所需的减法项，其可以与等矢量磁极化率相关。在合理的模型假设下，我们可以联合收割机将我们的计算与来自格点QCD的额外输入结合起来，将这种极化率约束为：β（p-n）= -0.87（85）×10（-4）fm 3。
We update the determination of the isovector nucleon electromagnetic self-energy, valid to leading order in QED. A technical oversight in the literature concerning the elastic contribution to Cottingham's formula is corrected, and modern knowledge of the structure functions is used to precisely determine the inelastic contribution. We find δM(p-n)(γ) = 1.30(03)(47) MeV. The largest uncertainty arises from a subtraction term required in the dispersive analysis, which can be related to the isovector magnetic polarizability. With plausible model assumptions, we can combine our calculation with additional input from lattice QCD to constrain this polarizability as: β(p-n) = -0.87(85)×10(-4) fm3.