Pion-Induced Radiative Corrections to Neutron β Decay
Pion-Induced Radiative Corrections to Neutron β Decay
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介子诱发的中子β衰变辐射修正
DOI：
10.1103/physrevlett.129.121801
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发表时间：
2022
影响因子：
8.6
通讯作者：
Walker-Loud, André
中科院分区：
文献类型：
--
作者：
Cirigliano, Vincenzo;de Vries, Jordy;Hayen, Leendert;Mereghetti, Emanuele;Walker-Loud, André
我们用低能强子有效场论计算了中子衰变的电磁修正。我们确定了新的辐射修正所产生的虚π介子，在以前的研究中错过了。最大的修正是核子轴向电荷的π-能级位移与π介子-质量分裂的电磁部分成正比。与预期的实验精度相比，较小的修正会影响角相关性和不对称性。我们评论的影响，我们的实验测量的核子轴向电荷与第一原理计算使用格QCD和潜在ofdecay实验约束超越标准模型相互作用的比较结果。
We compute the electromagnetic corrections to neutrondecay using a low-energy hadronic effective field theory. We identify new radiative corrections arising from virtual pions that were missed in previous studies. The largest correction is a percent-level shift in the axial charge of the nucleon proportional to the electromagnetic part of the pion-mass splitting. Smaller corrections, comparable to anticipated experimental precision, impact theangular correlations and theasymmetry. We comment on implications of our results for the comparison of the experimentally measured nucleon axial charge with first-principles computations using lattice QCD and on the potential ofdecay experiments to constrain beyond-the-standard-model interactions.