Single π⁺ Electroproduction in the First and Second Resonance Regions Using CLAS

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 2001

DOI:https://doi.org/10.2172/824889· OSTI ID:824889

Egiyan, Hovanes ^[1]

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1. College of William and Mary, Williamsburg, VA (United States)

The study of single pion electroproduction can provide valuable information on the structure of the nucleon and its excited states. Although these reactions have been studied for decades, never has the n π⁺ channel been measured over the complete phase space of the reaction. The CEBAF Large Acceptance Spectrometer (CLAS) located in Hall B of Jefferson Lab is well-suited for conducting these measurements. The CLAS data were taken using a 1.515 GeV electron beam incident on a liquid H₂ target. The cross sections have been extracted, and their phi-dependence has been fit to obtain the sigma_TT, sigma_TL and the sigma_T + epsilon sigma_L linear combination of the structure functions. An analysis program based on the Mainz unitary isobar model was used to analyze the experimental data from the π⁺ channel only. The resonant amplitudes for P₃₃(1232), S_L(1535) and D{sub 13}(1520) were obtained from the fit.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 824889
• Report Number(s): JLAB-PHY--01-64; DOE/ER/40150--2742
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
CROSS SECTIONS
ELECTRON BEAMS
ELECTROPRODUCTION
EXCITED STATES
ISOBAR MODEL
NUCLEONS
PHASE SPACE
PIONS
RESONANCE
SPECTROMETERS
STRUCTURE FUNCTIONS