Measurement of N* Cross-Sections from Single-Pion Electroproduction at low Q²

Thesis/Dissertation · Sat May 01 00:00:00 EDT 2021

OSTI ID:1784550

Tyler, Nicholas ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Canisius College, Buffalo, NY (United States)

Measurements of nucleon electroexcitation resonance cross-sections give unique insight into the dynamics of the strong interaction and our knowledge of Quantum Chromodynamics (QCD). The analysis of exclusive electroproduction data is an important tool in understanding the structure of the nucleon and its excited states. Exclusive channels give a clear way to extract the desired resonant contributions from non-resonant contributions. A gap in the helicity amplitudes extracted from single-pion cross-section data exists for virtual photon momentum transfers (Q²) in the range of 1- 2 GeV². Using data collected by the CEBAF Large Acceptance Spectrometer (CLAS) detector with a beam energy of 4.8 GeV, the reaction channel y*r → nπ⁺ is used in this study to investigate the kinematic region covering W=[1.1,1.82)GeV and Q²= [1.1,3.5)GeV². This work expands on the previous kinematic coverage for charged single-pion electroproduction and increases the angular coverage of previously extracted kinematic bins.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1784550
• Report Number(s): JLAB-PHY-21-3397; DOE/OR/23177-5217
• Country of Publication: United States
• Language: English