AI 中文总结
本提案利用GSIπ介子束设施与HADES，通过π-核子反应研究强QCD区域重子共振及电磁结构，补充光产生实验，并提升冷热核物质中强子性质与中微子-核相互作用的理解。
AI 中文摘要
我们提议利用GSI的π介子束设施并结合HADES探测器，研究强QCD区域中强子物质的动力学。该计划将通过基本π-核子相互作用研究强子物理，质心能量最高可达$\sqrt{s}\approx$2.35 GeV，将冷物质研究与排他反应的详细分析联系起来。我们的目标包括探索重子共振态的形成及其电磁结构。这将补充光产生实验（如ELSA），并增强我们对致密、热强子物质发射率的理解。关键课题包括研究重子与介子和虚光子的耦合，分析排他反应中的超子弱衰变，以及利用微分截面和极化观测量进行分波分析，以实现重子-介子耦合数据（$\rho$N、$\omega$N）前所未有的精度。此外，在核子上测量e$^{+}$e$^{-}$产生将提供对时间类区域中重子电磁跃迁形状因子的洞察，揭示矢量介子（$\rho$、$\omega$）的作用。在核靶上的反应允许详细研究强子性质，包括冷核物质中矢量介子的线形和强度。这些测量为解释$A+A$碰撞中产生的热密环境结果提供了关键参考。这项研究还具有更广泛的意义。它将有助于中微子-核相互作用的建模，促进对超核形成的空前研究，并增强我们对不同能量区域强相互作用动力学的理解。
英文摘要
We propose to investigate the dynamics of hadronic matter in the strong QCD regime using the pion-beam facility at GSI in conjunction with HADES. This program will study hadron physics through elementary pion-nucleon interactions up to $\sqrt{s}\approx$2.35 GeV, bridging cold matter research with detailed analyses of exclusive reactions. Our goals include exploring baryon resonance formation and their electromagnetic structures. This will complement photo-production experiments (e.g., ELSA) and enhance our understanding of emissivity in dense, hot hadronic matter. Key topics include examining baryon couplings to mesons and virtual photons, analyzing hyperon weak decays in exclusive reactions, and using Partial Wave Analyses with differential cross sections and polarization observables to achieve unprecedented precision in baryon-meson coupling data ($ρ$N, $ω$N). Furthermore, e$^{+}$e$^{-}$ production measurements off nucleons will provide insight into the electromagnetic transition form factors of baryons in the time-like region, revealing the role of vector mesons ($ρ$, $ω$). Reactions on nuclear targets allow for detailed studies of hadron properties, including vector-meson line shapes and strengths in cold nuclear matter. These measurements provide a critical reference for the interpretation of results from the hot and dense environment created in $A+A$ collisions. This research also has broader implications. It will contribute to the modeling of neutrino-nucleus interactions, facilitate unprecedented investigations into hypernuclei formation, and enhance our understanding of strong interaction dynamics across different energy regimes.
