发表机构
Shandong University; Chinese Academy of Sciences(山东大学; 中国科学院)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
针对Sudakov展宽和末态软辐射方位角谐波限制胶子层析成像精度的问题,提出用基准强子反冲结合标记喷注的方法抑制两类效应,在DIS的$h_1^{\bottom g}$探测基准实验中显著提升信号、压低本底,实现高精度胶子TMD层析成像。
AI 中文摘要
Sudakov展宽以及末态软辐射产生的竞争方位角谐波限制了胶子层析成像的精度。我们利用基准强子反冲——即某一快度区间内所有强子横动量的矢量和——来抑制这两种效应,同时用标记喷注固定方位角轴。动量守恒确保该区间内的辐射既不会造成反冲展宽,也不会对这些谐波产生贡献,因此拓宽区间无需软辐射否决即可降低二者的影响。作为基准,我们研究了深度非弹性散射(DIS)中用于探测$h_1^{\bot g}$的$\text{cos}2\theta$调制。在快度区间$\text{Δη}=3$的条件下,相较于传统的双喷注不平衡方法,基准反冲将$h_1^{\bot g}$的贡献增强了4.6倍,同时将末态软胶子项抑制了4.0倍。由此,基准反冲为高精度胶子横动量依赖(TMD)层析成像提供了可行路径。
英文摘要
Sudakov broadening and competing azimuthal harmonics from final-state soft radiation limit the precision of gluon tomography. We suppress both effects using fiducial hadronic recoil---the vector sum of all hadronic transverse momenta within a rapidity interval---while a tagged jet fixes the azimuthal axis. Momentum conservation ensures that emissions inside the interval contribute neither to recoil broadening nor to these harmonics, so widening the interval reduces their impact without a soft-radiation veto. As a benchmark, we study the $\cos 2ϕ$ modulation probing $h_1^{\perp g}$ in DIS. For rapidity interval $Δη=3$, fiducial recoil enhances the $h_1^{\perp g}$ contribution by a factor of $4.6$ and suppresses the final-state soft gluon term by a factor of $4.0$ relative to the conventional dijet imbalance. Fiducial recoil thereby enables precision gluon-TMD tomography.
Comments8 pages, 4 figures