Measurement of the polarized structure function sigma_LT^' for pion electroproduction in the Roper-resonance region
The polarized longitudinal-transverse structure function sigma{sub LT'} 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'} in the N(1440)1/2+ (Roper) resonance region at Q2=0.40 and 0.65GeV2 for both the pi0p and pi+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'}(pi+n) channel shows a large sensitivity to the Roper-resonance multipoles M1- and S1- and provides new constraints on models of resonance formation.
- 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:
- 875493
- Report Number(s):
- JLAB-PHY-05-416; DOE/ER/40150-3638; PRVCAN; TRN: US0601092
- Journal Information:
- Physical Review, C (Nuclear Physics), Vol. 72; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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