发表机构
Arya Vidyapeeth College(阿里亚维达佩特学院)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
该研究在 QCD 启发势模型中,通过高斯展宽正则化自旋-自旋项并采用 Dalgarno-Lewis 微扰法,解析计算了 B 和 D 介子的超精细结构,给出了 2S 态和 B_c 系统的预测,为光谱测量提供了基准。
AI 中文摘要
我们在基于 Cornell 假设的 QCD 启发势模型中研究了 $B$ 和 $D$ 介子的超精细结构。传统的接触自旋-自旋项通过高斯展宽进行正则化,以消除短距离奇异性,并利用 Dalgarno-Lewis 微扰方法(以库仑部分为母项)获得解析波函数。数值研究已扩展到包括显式的 2S 超精细预测以及 $B_c$ 系统的结果;这些补充探究了不等质量系统和径向激发下势参数空间(有效 $\alpha_s$、禁闭强度和展宽宽度)的稳定性。我们还对固定有效耦合 $\alpha_s$ 进行了简短的敏感性研究,并讨论了展宽参数 $\sigma$ 的物理解释。该组合的解析和唯象框架为即将到来的光谱测量提供了紧凑、可检验的基准。
英文摘要
We investigate the hyperfine structure of $B$ and $D$ mesons within a QCD-inspired potential model based on the Cornell ansatz. The conventional contact spin--spin term is regularized with a Gaussian smearing to remove the short-distance singularity, and analytic wavefunctions are obtained using the Dalgarno--Lewis perturbative method with the Coulomb part as parent. The numerical study has been extended to include explicit 2S hyperfine predictions and results for the $B_c$ system; these additions probe the stability of the potential parameter space (effective $α_s$, confinement strength and smearing width) for unequal-mass systems and radial excitations. We also present a short sensitivity study of the fixed effective coupling $α_s$ and discuss the physical interpretation of the smearing parameter $σ$. The combined analytic and phenomenological framework provides compact, testable benchmarks for upcoming spectroscopy measurements.
Comments8 pages, 2 Tables, 2 figures
Journal refpublished in Eur. Phys. J. Plus (2025) 140:1069
DOI:10.1140/epjp/s13360-025-07031-3