The axial charge of the triton is investigated using lattice quantum chromodynamics (QCD). Extending previous work at heavier quark masses, calculations are performed using three ensembles of gauge field configurations generated with quark masses corresponding to a pion mass of 450?MeV and a single value of the lattice spacing. Finite-volume energy levels for the triton, as well as for the deuteron and diproton systems, are extracted from analysis of correlation functions computed on these ensembles, and the corresponding energies are extrapolated to infinite volume using finite-volume pionless effective field theory (FVEFT). It is found with high likelihood that there is a compact bound state with the quantum numbers of the triton at these quark masses. The axial current matrix elements are computed using background field techniques on one of the ensembles and FVEFT is again used to determine the axial charge of the proton and triton. A simple quark mass extrapolation of these results and earlier calculations at heavier quark masses leads to a value of the ratio of the triton to proton axial charges at the physical quark masses of g A H 3 / g A p = 0.91 ? 0.09 + 0.07 . This result is consistent with the ratio determined from experiment and prefers values less than unity (in which case the triton axial charge would be unmodified from that of the proton), thereby demonstrating that QCD can explain the modification of the axial charge of the triton.
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机译：使用晶格量子色动力学（QCD）研究了Triton的轴向电荷。在较重的夸克群众延伸以前的工作，使用用夸克肿块产生的规格场配置进行计算，与450？MEV的π孔和晶格间距的单个值相对应的夸克质量来执行。基于在这些集合上计算的相关函数的分析中提取了Triton以及氘核和Deuteron和Deuteron系统的有限体积能级，并且使用有限体积无缺陷有效场理论（FVEFT ）。它被发现具有很高的可能性，即在这些夸克群众中存在具有较大的绑定状态。使用背景技术技术计算轴向电流矩阵元件，并且再次用于确定质子和Triton的轴向电荷。这些结果的简单夸克质量外推，较重的夸克质量的较早计算导致TRITON与质子轴向电荷的值为G a H 3 / g a p = 0.91的质子轴向电荷的值0.09 + 0.07。该结果与从实验确定的比率一致，更喜欢少于单位的值（在这种情况下，Triton轴向电荷将从质子的轴线上未改进），从而证明QCD可以解释Triton的轴向电荷的修改。
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