Pion electroproduction measurements in the nucleon resonance region

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-05 DOI:arxiv-2409.03750

R. Li, N. Sparveris, H. Atac, M. K. Jones, M. Paolone, Z. Akbar, M. Ali, C. Ayerbe Gayoso, V. Berdnikov, D. Biswas, M. Boer, A. Camsonne, J. -P. Chen, M. Diefenthaler, B. Duran, D. Dutta, D. Gaskell, O. Hansen, F. Hauenstein, N. Heinrich, W. Henry, T. Horn, G. M. Huber, S. Jia, S. Joosten, A. Karki, S. J. D. Kay, V. Kumar, X. Li, W. B. Li, A. H. Liyanage, D. Mack, S. Malace, P. Markowitz, M. McCaughan, Z. -E. Meziani, H. Mkrtchyan, C. Morean, M. Muhoza, A. Narayan, B. Pasquini, M. Rehfuss, B. Sawatzky, G. R. Smith, A. Smith, R. Trotta, C. Yero, X. Zheng, J. Zhou

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Abstract

We report new pion electroproduction measurements in the $\Delta(1232)$ resonance, utilizing the SHMS - HMS magnetic spectrometers of Hall C at Jefferson Lab. The data focus on a region that exhibits a strong and rapidly changing interplay of the mesonic cloud and quark-gluon dynamics in the nucleon. The results are in reasonable agreement with models that employ pion cloud effects and chiral effective field theory calculations, but at the same time they suggest that an improvement is required to the theoretical calculations and provide valuable input that will allow their refinements. The data illustrate the potential of the magnetic spectrometers setup in Hall C towards the study the $\Delta(1232)$ resonance. These first reported results will be followed by a series of measurements in Hall C, that will expand the studies of the $\Delta(1232)$ resonance offering a high precision insight within a wide kinematic range from low to high momentum transfers.

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核子共振区的质子电产测量

我们报告了利用杰弗逊实验室霍尔C的SHMS-HMS磁谱仪在$\Delta(1232)$共振中进行的新的先驱电产测量。数据集中在一个区域，该区域显示了介子云和夸克-胶子动力学在当时核子中强烈而快速变化的相互作用。这些结果与采用先驱云效应和手性有效场理论计算的模型有合理的一致性，但同时也表明需要对理论计算进行改进，并为其完善提供了有价值的信息。这些数据说明了霍尔中心的磁谱仪在研究$\Delta(1232)$共振方面的潜力。这些首次报告的结果之后将在霍尔C进行一系列测量，这将扩大对$\Delta(1232)$共振的研究，在从低到高动量传递的广泛运动学范围内提供高精度的洞察力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Nuclear Theory

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