Measurement of the polarized structure function {sigma}{sub LT{sup '}} for pion electroproduction in the Roper-resonance region
- University of Connecticut, Storrs, Connecticut 06269 (United States)
- University of Virginia, Charlottesville, Virginia 22901 (United States)
- Yerevan Physics Institute, 375036 Yerevan (Armenia)
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States); and others
The polarized longitudinal-transverse structure function {sigma}{sub LT{sup '}} measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and nonresonant processes. We report new measurements of {sigma}{sub LT{sup '}} in the N(1440)(1/2){sup +} (Roper) resonance region at Q{sup 2}=0.40 and 0.65GeV{sup 2} for both the {pi}{sup 0}p and {pi}{sup +}n channels. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at a beam energy of 1.515 GeV. Complete angular distributions were obtained and are compared to recent phenomenological models. The {sigma}{sub LT{sup '}}({pi}{sup +}n) channel shows a large sensitivity to the Roper-resonance multipoles M{sub 1-} and S{sub 1-} and provides new constraints on models of resonance formation.
- OSTI ID:
- 20699156
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 72, Issue 5; Other Information: DOI: 10.1103/PhysRevC.72.058202; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). CLAS Collaboration; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMPLITUDES
ANGULAR DISTRIBUTION
CEBAF ACCELERATOR
COUPLING
ELECTRON BEAMS
ELECTRON REACTIONS
ELECTROPRODUCTION
FOUR MOMENTUM TRANSFER
GEV RANGE
INTERFERENCE
MULTIPOLES
N-1440 BARYONS
PARITY
PIONS NEUTRAL
PIONS PLUS
POLARIZATION
POLARIZED BEAMS
SENSITIVITY
SPIN
STRUCTURE FUNCTIONS