协变重子手征微扰理论中$|ΔI|=3/2$的非轻子超子衰变
$|ΔI|=3/2$ non-leptonic hyperon decays in covariant baryon chiral perturbation theory
浏览论文内容
中文总结 AI 辅助
该研究针对BESIII的非轻子超子衰变测量，在协变重子手征微扰理论中重新分析$|ΔI|=3/2$振幅，评估多类修正效应，发现一致耦合方案的 decuplet 贡献可显著改善拟合质量。
中文摘要 AI 辅助
受BESIII近期非轻子超子衰变测量的启发，我们在采用扩展在壳（extended-on-mass-shell）重整化方案的协变重子手征微扰理论中重新研究其$|ΔI|=3/2$振幅。采用与早期重子手征微扰理论分析相同的受限图拓扑集合，我们评估相对论修正、显式 decuplet 重子、不同的自旋-3/2耦合方案及介子圈贡献的效应。结果显示，仅相对论效应仅带来轻微变化，而 decuplet 贡献（尤其在一致耦合方案中）显著提升拟合质量，介子圈贡献进一步降低$χ^2$值，我们强调 decuplet 领域一致耦合方案对描述所选$|ΔI|=3/2$振幅的重要性。
英文摘要
Inspired by the recent BESIII measurements of non-leptonic hyperon decays, we reexamine their $|ΔI|=3/2$ amplitudes in covariant baryon chiral perturbation theory with the extended-on-mass-shell renormalization scheme. Using the same restricted set of diagrammatic topologies as in the early analyses in heavy baryon chiral perturbation theory, we assess the effects of relativistic corrections, explicit decuplet baryons, different spin-$3/2$ coupling schemes, and pion-loop contributions. Our results show that relativistic effects alone lead to only mild changes, while decuplet contributions, especially in the consistent-coupling scheme, significantly improve the fit quality. Pion-loop contributions further reduce the $χ^2$ values. We highlight the importance of the consistent coupling scheme in the decuplet sector for describing the selected $|ΔI|=3/2$ amplitudes.
