Nucleon electromagnetic form factors in two-flavor QCD
Nucleon electromagnetic form factors in two-flavor QCD
复制标题
双味 QCD 中的核电磁形状因子
DOI：
10.1103/physrevd.92.054511
复制
发表时间：
2015
影响因子：
5
通讯作者：
H. Wittig
中科院分区：
文献类型：
--
作者：
S. Capitani;M. Della Morte;D. Djukanovic;G. von Hippel;J. Hua;B. Jäger B. Knippschild;H.B. Meyer;T.D. Rae;H. Wittig
我们给出了核子电磁形状因子的结果，包括动量转移依赖性和导出的量（电荷半径和磁矩）。分析是用改进的Wilson费米子在QCD中的坐标格子模拟系综上测量得到的。特别关注的是放置在一个系统的评价激发态的影响，在三点相关函数，这会导致一个有偏见的评价，如果不正确占。我们认为，使用求和运算符插入和适合Ansätze包括激发态，使我们能够抑制和控制这种效果。我们采用了一种新的方法进行联合手征和连续外推，通过拟合的形状因子直接协变重子手征有效场论的表达式。我们的晶格计算的电荷半径和磁矩的最终结果首次包括了完整的误差预算。我们发现，我们的估计是兼容的实验结果在其整体的不确定性。
We present results for the nucleon electromagnetic form factors, including the momentum transfer dependence and derived quantities (charge radii and magnetic moment). The analysis is performed usingimproved Wilson fermions inQCD measured on the Coordinated Lattice Simulations ensembles. Particular focus is placed on a systematic evaluation of the influence of excited states in three-point correlation functions, which lead to a biased evaluation, if not accounted for correctly. We argue that the use of summed operator insertions and fit Ansätze including excited states allow us to suppress and control this effect. We employ a novel method to perform joint chiral and continuum extrapolations, by fitting the form factors directly to the expressions of covariant baryonic chiral effective field theory. The final results for the charge radii and magnetic moment from our lattice calculations include, for the first time, a full error budget. We find that our estimates are compatible with experimental results within their overall uncertainties.