Revisiting proton–proton fusion in chiral effective field theory
Revisiting proton–proton fusion in chiral effective field theory
复制标题
重新审视手性有效场理论中的质子与质子聚变
DOI：
10.1088/1361-6471/ace3e2
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Platter, Lucas
中科院分区：
文献类型：
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作者：
Acharya, Bijaya;Marcucci, Laura Elisa;Platter, Lucas
我们利用手性有效场理论的相互作用和电流计算质子-质子聚变的s因子。通过以不同方式进行正则化和校准的各种手性相互作用的逐级计算，我们从有效场论展开的截断和s因子对由三核子和四核子观测值确定的短距离轴向电流的灵敏度评估了s因子的不确定性。我们发现S(0)=（4.100±0.024 （syst）±0.013 （stat）±0.008 (g A)）× 10−23 MeV fm2，其中三个不确定性分别来自有效场论展开的截断，使用双核子轴向电流拟合少量核子观测值以及轴向耦合常数在推荐范围内的变化。与以前的计算相比，S(0)值的增加主要是由于轴向耦合常数推荐值的增加，并且与最近基于无轴有效场理论的分析一致。
We calculate the S-factor for proton–proton fusion using chiral effective field theory interactions and currents. By performing order-by-order calculations with a variety of chiral interactions that are regularized and calibrated in different ways, we assess the uncertainty in the S-factor from the truncation of the effective field theory expansion and from the sensitivity of the S-factor to the short-distance axial current determined from three-and four-nucleon observables. We find that S (0)=(4.100±0.024 (syst)±0.013 (stat)±0.008 (g A))× 10− 23 MeV fm 2, where the three uncertainties arise, respectively, from the truncation of the effective field theory expansion, use of the two-nucleon axial current fit to few-nucleon observables and variation of the axial coupling constant within the recommended range. The increased value of S (0) compared to previous calculations is mainly driven by an increase in the recommended value for the axial coupling constant and is in agreement with a recent analysis based on pionless effective field theory.