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η 和 η^{'} 在 J/ψ 中的产量 辐射衰变从量子染色力学
Mischa Batelaan1, Jozef J Dudek1,2, Robert G Edwards2
1College of William and Mary, Department of Physics, Williamsburg, Virginia 23187, USA.
Physical review letters
|October 31, 2025
概括
这项研究计算了J/ψ (J/psi) 的辐射衰变成 η (eta) 和 η' (eta) 质子,使用格子量子色谱学 (QCD). 结果显示增强了 η' 产生,验证了未来中子共振研究的晶格QCD技术.
科学领域:
- 核物理 核物理 核物理
- 粒子物理学 粒子物理学
- 量子色态动力学 量子色态动力学
背景情况:
- J/ψ质子的辐射衰变为基本粒子相互作用提供了洞察力.
- 格子量子染色力学 (QCD) 是粒子物理学中非扰动计算的强大工具.
研究的目的:
- 为了执行J/ψ辐射衰变成η和η'介质的第一原理计算.
- 使用格子QCD,在一系列光子虚拟性中确定过渡形状因子.
- 用新型格子技术探索J/ψ衰变中的 η和 η'的产生.
主要方法:
- 利用晶格量子色谱学 (QCD) 用两个退化的轻夸克风味和一个更重的奇怪夸克.
- 采用变量优化的操作员来提高信号纯度和减少不确定性.
- 在杂的,不连接的过程中实现了高质量的结果的新型相关系数平均化程序.
- 计算过渡形状因子从类似时间区域到真实光子点.
主要成果:
- 成功计算了J/ψ辐射衰变成η和η'介质的过渡形态因子.
- 观测到与n meson相比,n meson的产量增加,与理论预期一致.
- 证明了访问 η'的能力,作为第一个带有伪尺度等尺度量子数的激发状态.
结论:
- 这项研究验证了格子QCD技术的使用,用于计算涉及轻型伪尺度中子的辐射衰变.
- 开发的方法适用于未来对产生光介子共振的过程的研究.
- 为了解J/ψ质子衰变以及η和η'质子的特性提供了关键数据.
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