法国巴黎萨克雷大学Edoardo Alviani团队研究了核衰变的库仑修正。2025年7月3日出版的《高能物理杂志》发表了这项成果。

研究组提出了依赖于壳振幅方法和大质量粒子的旋量变量的β衰变振幅的洛伦兹不变和小群协变描述。该框架用于计算衰减幅度的库仑修正及其对T-奇相关系数（包括D参数）的贡献。

在SM极限下，研究组恢复了已知的库仑对D的贡献结果，并更新了它们的数值。他们还计算了在存在非标准标量和张量相互作用的情况下对D的新的子主导贡献。研究组还指出，在SM中产生了另一个与D参数相同阶数的T-奇数相关系数，并为所选的过渡提供了它们的数值。

附：英文原文

Title: On the Coulomb corrections in nuclear beta decay

Author: Alviani, Edoardo, Falkowski, Adam

Issue&Volume: 2025-07-03

Abstract: We propose a Lorentz invariant and little group covariant description of beta decay amplitudes relying on on-shell amplitude methods and the spinor variables for massive particles. The framework is employed to calculate Coulomb corrections to the decay amplitude and their contribution to T-odd correlation coefficients, including the D parameter. In the SM limit we recover the known results for the Coulomb contributions to D and update their numerical values. We also calculate new subleading contributions to D in the presence of non-standard scalar and tensor interactions. We also point out that another T-odd correlation coefficient is generated in the SM at the same order as the D parameter, and provide their numerical values for selected transitions.

DOI: 10.1007/JHEP07(2025)059

Source: https://link.springer.com/article/10.1007/JHEP07(2025)059