Muon capture on deuteron using local chiral potentials
Muon capture on deuteron using local chiral potentials
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使用局部手性势捕获氘核上的 μ 子
DOI：
10.3389/fphy.2022.1049919
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
M. Viviani
中科院分区：
文献类型：
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作者：
L. Ceccarelli;A. Gnech;L. Marcucci;M. Piarulli;M. Viviani
利用手征等效场理论导出的局域的、在坐标空间表示的一致电流和核势，研究了双重态超精细态下的介子俘获反应μ−+d→n+n+νμ(所谓的诺福克模型)。只考虑了1 S 0nn散射态的最大贡献。特别注意了理论不确定性的估计，确定了四个来源：1)模型依赖性，2)弱核流的手征序收敛，3)单核子轴向形状因子的不确定性，以及4)求解约束和散射A=2系统所采用的数值技术。事实证明，这最后一个不确定性来源基本上可以忽略不计。对于1个S 0的双重态介子俘获速率ΓD(S 0 1)，我们得到了ΓD(S 0 1)=0.6(0.6)(4.4)(2.9)S−1，其中三个误差来自前三个不确定度来源。在这个局域手性框架内得到的ΓD(S 0 1)的值与以前的计算结果进行了比较，发现两者是非常一致的。
The muon capture reaction μ − + d → n + n + ν μ in the doublet hyperfine state is studied using nuclear potentials and consistent currents derived in the chiral effective field theory, which are local and expressed in coordinate space (the so-called Norfolk models). Only the largest contribution due to the 1 S 0 nn scattering state is considered. Particular attention is given to the estimate of theoretical uncertainty, for which four sources have been identified: 1) the model dependence, 2) the chiral-order convergence for the weak nuclear current, 3) the uncertainty in the single-nucleon axial form factor, and 4) the numerical technique adopted to solve the bound and scattering A = 2 systems. This last source of uncertainty has turned out to be essentially negligible. For the 1 S 0 doublet muon capture rate Γ D ( S 0 1 ) , we obtain Γ D ( S 0 1 ) = 255.8 ( 0.6 ) ( 4.4 ) ( 2.9 ) s−1, where the three errors come from the first three sources of uncertainty. The value for Γ D ( S 0 1 ) obtained within this local chiral framework is compared with previous calculations and found in very good agreement.