Ab initio calculation of the β -decay spectrum of He6
Ab initio calculation of the β -decay spectrum of He6
复制标题
He6 β 衰变谱的从头计算
DOI：
10.1103/physrevc.107.015503
复制
发表时间：
2023
影响因子：
3.1
通讯作者：
Piarulli, M.
中科院分区：
文献类型：
--
作者：
King, G. B.;Baroni, A.;Cirigliano, V.;Gandolfi, S.;Hayen, L.;Mereghetti, E.;Pastore, S.;Piarulli, M.
我们使用量子蒙特卡罗方法，利用源自手性有效场理论的核相互作用以及一致的弱矢量和轴向电流来计算衰减中的光谱。我们在多极展开式中进行二阶工作，保留受抑制的项，其中 表示低能尺度，例如反应值或电子能量， 是 π 质量。我们通过考虑二体矢量和轴向电流的影响来超越脉冲近似。我们通过使用局部二核子和三核子相互作用的诺福克族中的四个潜在模型来估计能谱上的理论误差，这些模型具有不同的截止值，将二核子数据拟合到不同的能量，并使用不同的可观测量来确定三体力中的耦合。我们发现频谱上的理论不确定性（通过总速率归一化）远低于千分率水平，并且从多极展开式中的一阶和二阶校正中获得了相当大小的贡献。我们考虑了对标准模型有效场理论中超标准模型带电电流相互作用引起的衰变谱的修正，有或没有惰性中微子，并讨论了下一代实验对这些相互作用的敏感性。
We calculate thespectrum in the decay ofusing quantum Monte Carlo methods with nuclear interactions derived from chiral effective field theory and consistent weak vector and axial currents. We work at second order in the multipole expansion, retaining terms suppressed by, wheredenotes low-energy scales such as the reaction'svalue or the electron energy, andis the pion mass. We go beyond the impulse approximation by including the effects of two-body vector and axial currents. We estimate the theoretical error on the spectrum by using four potential models in the Norfolk family of local two- and three-nucleon interactions, which have different cutoffs, fit two-nucleon data up to different energies, and use different observables to determine the couplings in the three-body force. We find the theoretical uncertainty on thespectrum, normalized by the total rate, to be well below the permille level, and to receive contributions of comparable size from first- and second-order corrections in the multipole expansion. We consider corrections to thedecay spectrum induced by beyond-standard-model charged-current interactions in the standard model effective field theory, with and without sterile neutrinos, and discuss the sensitivity of the next generation of experiments to these interactions.