论文标题
在$χ$ eft方法中，在高动量转移下以高动量转移的磁性结构
Magnetic structure of few-nucleon systems at high momentum transfers in a $χ$EFT approach
论文作者
论文摘要
在手学有效野外理论（$χ$ eft）中的电磁电流中，五个低能常数（LEC）最多一个循环确定，由同时拟合$ a \，$ = $ = $ = $ = $ = $ -3核 - 3个核 - 3个核 - 3个核磁矩，并屈服于deuteron磁性的形态和阈值电位，而不是倾斜的电位范围。然后，由此产生的参数化产生了$^3 $ He/$^3 $ h磁性形式的预测，与$ \ $ eft方法的预期有效性状态超出了预期的有效性状态，符合最高$ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \ 0.8 $ gev/c的实验值。该计算基于最后一代的两核互动，包括手性膨胀中的高阶，并由Entem，Macheleidt和Nosyk [phys。\ rev. \ rev. \ c {\ bf 96}，024004（2017）]和piarulli {\ it. e e e e et and py. c c c c c c {\ c c c c c c。 （2016）]，使用不同的$χ$ eft公式。在$ a \，$ = $ \，3 $计算中，（手性）三核互动也被解释了。发现相互作用的这些不同公式产生的模型依赖性被认为是轻度的，对于$ \ \ \ \ 0.8 $ gev/c的动量转移。还提供了手性膨胀的收敛性分析。
The five low-energy constants (LECs) in the electromagnetic current derived in chiral effective field theory ($χ$EFT) up to one loop are determined by a simultaneous fit to the $A\,$=$\,2$--3 nuclei magnetic moments and to the deuteron magnetic form factor and threshold electrodisintegration at backward angles over a wide range of momentum transfers. The resulting parametrization then yields predictions for the $^3$He/$^3$H magnetic form factors in excellent accord with the experimental values for momentum transfers ranging up to $\approx 0.8$ GeV/c, beyond the expected regime of validity of the $χ$EFT approach. The calculations are based on last-generation two-nucleon interactions including high orders in the chiral expansion and derived by Entem, Macheleidt, and Nosyk [Phys.\ Rev.\ C {\bf 96}, 024004 (2017)] and by Piarulli {\it et al.} [Phys.\ Rev.\ C {\bf 94}, 054007 (2016)], using different $χ$EFT formulations. In the $A\,$=$\,3$ calculations, (chiral) three-nucleon interactions are also accounted for. The model dependence resulting from these different formulations of the interactions is found to be mild for momentum transfer below $\approx0.8$ GeV/c. An analysis of the convergence of the chiral expansion is also provided.
