用CLAS和CLAS12研究受激核子谱和结构

D. Carman
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引用次数: 5

摘要

利用电产生排他反应来研究激发态的谱和结构是探索非微扰强相互作用性质的重要途径。在Hall~B中的CLAS探测器提供了在$Q^2$高达5~GeV$^2$的共振区域中与核子有关的介子电产生通道的大部分可用世界数据。对质子靶上$\pi N$、$\eta N$和$\pi^+ \pi^- p$独家通道的CLAS数据的分析,提供了在$W$=1.8~GeV的质量范围内从初始光子-质子到最终$N^*$态的电激发振幅的$Q^2$演变的唯一结果。这些电耦合允许探索产生的激发态核子的内部结构。这项工作清楚地表明,对具有不同共振强子衰变参数和非共振背景但具有相同的$N^*$电激励幅值的几个独占通道的独立分析结果的一致性对于对提取结果的信心至关重要。从2018年初开始,使用新的CLAS12光谱仪研究各种独家电生产渠道中$N^*$状态的光谱和结构的计划开始了。这些研究将在$W$=3~GeV和$Q^2$低至0.05~GeV$^2$和高至10 ~ 12~GeV$^2$的质量范围内探测$N^*$的结构,从而提供一种跨越广泛距离尺度访问$N^*$结构信息的手段。准真实的光生产研究也计划寻找额外的$N^*$状态,即所谓的混合重子,其中胶水作为活跃的结构成分。在这次演讲中,我们将回顾CLAS和class12的$N^*$程序。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Excited nucleon spectrum and structure studies with CLAS and CLAS12
The study of the spectrum and structure of excited nucleon states employing the electroproduction of exclusive reactions is an important avenue for exploring the nature of the non-perturbative strong interaction. The CLAS detector in Hall~B has provided the dominant part of the available world data on most relevant meson electroproduction channels off the nucleon in the resonance region for $Q^2$ up to 5~GeV$^2$. Analyses of CLAS data for the exclusive channels $\pi N$, $\eta N$, and $\pi^+ \pi^- p$ on a proton target have provided the only results available on the $Q^2$ evolution of the electro-excitation amplitudes for the transitions from the initial photon-proton to the final $N^*$ states in the mass range up to $W$=1.8~GeV. These electrocouplings allow for exploration of the internal structure of the produced excited nucleon states. This work has made it clear that consistent results from independent analyses of several exclusive channels with different resonance hadronic decay parameters and non-resonant backgrounds but the same $N^*$ electro-excitation amplitudes, is essential to have confidence in the extracted results. Starting in early 2018, a program to study the spectrum and structure of $N^*$ states in various exclusive electroproduction channels using the new CLAS12 spectrometer commenced. These studies will probe the structure of $N^*$ states in the mass range up to $W$=3~GeV and for $Q^2$ as low as 0.05~GeV$^2$ and as high as 10-12~GeV$^2$, thus providing a means to access $N^*$ structure information spanning a broad range of distance scales. Quasi-real photoproduction studies are also planned to search for additional $N^*$ states, the so-called hybrid baryons, for which the glue serves as an active structural component. In this talk the $N^*$ programs from both CLAS and CLAS12 will be reviewed.
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