Nucleon resonance electroproduction results from SLAC: {ital R}={sigma}{sub {ital L}}/{sigma}{sub {ital T}} and the Roper P{sub 11}(1440) resonance

Journal Article · Wed May 10 04:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48220· OSTI ID:165633

Keppel, C ^[1]

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1. Virginia Union University, Richmond, Virginia 23220 (United States)

Inclusive measurements of nucleon resonance cross sections for large angle (14{degree}{lt}{theta}{lt}61{degree}) electron scattering from deuterium and hydrogen have been measured for incident energies of 2{lt}{ital E}{sub 0}{lt}9.75 GeV. Scattered electrons were detected in both the 8 GeV and 1.6 GeV spectrometers in End Station A at the Stanford Linear Accelerator Center (SLAC). The cross sections have been used in conjunction with previous SLAC data to perform Rosenbluth type separations and to measure the longitudinal component of the cross sections. {ital R}={sigma}{sub {ital L}}/{sigma}{sub {ital T}}, the ratio of the longitudinal and transverse components of the cross section, is presented and is found to be small throughout the entire resonance region (1{lt}{ital W}{sup 2}{lt}4 GeV{sup 2}). Some necessary reanalysis of existing data and a global fit to all available SLAC resonance region data are discussed. Possible evidence for the Roper P{sub 11}(1440) resonance is noted. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Sponsoring Organization: USDOE
• OSTI ID: 165633
• Report Number(s): CONF-9405132--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 334; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
ELECTRON-DEUTERON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
EXPERIMENTAL DATA
GEV RANGE 01-10
INCLUSIVE INTERACTIONS
RESONANCE SCATTERING