Eur. Phys. J. A (2024) 60: 168
https://doi.org/10.1140/epja/s10050-024-01391-7

Letter

Pion electroproduction measurements in the nucleon resonance region

¹ Temple University, 19122, Philadelphia, PA, USA
² Jefferson Lab, 23606, Newport News, VA, USA
³ New Mexico State University, 88003, Las Cruces, NM, USA
⁴ Florida International University, 33199, University Park, FL, USA
⁵ Catholic University of America, 20064, Washington, DC, USA
⁶ Hampton University, 23669, Hampton, VA, USA
⁷ Mississippi State University, 39762, Mississippi State, MS, USA
⁸ The College of William and Mary, 23185, Williamsburg, VA, USA
⁹ Old Dominion University, 23529, Norfolk, VA, USA
¹⁰ University of Regina, S4S 0A2, Regina, SK, Canada
¹¹ Argonne National Laboratory, 60439, Lemont, IL, USA
¹² Artem Alikhanian National Laboratory, Yerevan, Armenia
¹³ University of Tennessee, 37996, Knoxville, TN, USA
¹⁴ Veer Kunwar Singh University, 802301, Arrah, Bihar, India
¹⁵ University of Pavia, 27100, Pavia, PV, Italy
¹⁶ Duke University, 27708, Durham, NC, USA
¹⁷ University of Virginia, 22904, Charlottesville, VA, USA
¹⁸ INFN, 27100, Pavia, PV, Italy
¹⁹ Virginia Polytechnic Institute & State University, 24061, Blacksburg, VA, USA

^b sparveri@temple.edu

Received: 26 March 2024
Accepted: 1 August 2024
Published online: 29 August 2024

Abstract

We report new pion electroproduction measurements in the 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 resonance. These first reported results will be followed by a series of measurements in Hall C, that will expand the studies of the resonance offering a high precision insight within a wide kinematic range from low to high momentum transfers.