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arXiv 2304.03327nucl-thastro-ph.SRhep-ph
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在手征有效场论中重新审视质子-质子聚变

Revisiting proton-proton fusion in chiral effective field theory

Bijaya Acharya, Laura Elisa Marcucci, Lucas Platter

AI总结:

该研究利用多种手征有效场论相互作用与轴矢流逐阶计算质子-质子聚变的 $S$ 因子,量化展开截断、短程轴矢流和 $g_A$ 不确定性,得到更高的 $S(0)$ 并与无π有效场论结果一致。

摘要:

我们使用手征有效场论相互作用和流计算质子-质子聚变的 $S$ 因子。通过采用多种以不同方式正则化和校准的手征相互作用进行逐阶计算,我们评估了来自有效场论展开截断以及 $S$ 因子对由三核子和四核子观测量确定的短程轴矢流敏感性所导致的 $S$ 因子不确定性。我们得到 $S(0)=(4.100\pm0.019\mathrm{(syst)}\pm0.013\mathrm{(stat)}\pm0.008(g_A))\times10^{-23}~\mathrm{MeV\\,fm}^2$,其中三个不确定性分别来自有效场论展开截断、将两核子轴矢流拟合到少核子观测量,以及轴矢耦合常数在推荐范围内的变化。与以往计算相比,$S(0)$ 数值的增加主要由轴矢耦合常数推荐值的提高所驱动,并与近期一项基于无π有效场论的分析相一致。

英文摘要:

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 $S(0)=(4.100\pm0.019\mathrm{(syst)}\pm0.013\mathrm{(stat)}\pm0.008(g_A))\times10^{-23}~\mathrm{MeV\,fm}^2\,,$ 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.

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