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Pion electroproduction measurements in the nucleon resonance region

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arxiv 2409.03750 v1 pith:MDE7JA4M submitted 2024-09-05 nucl-ex nucl-th

R. Li , N. Sparveris , H. Atac , M. K. Jones , M. Paolone , Z. Akbar , M. Ali , C. Ayerbe Gayoso
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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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classification nucl-exnucl-th
keywords resonancedeltahallmeasurementspionwillcalculationscloud
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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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