Beam-Recoil Polarization Transfer in the Nucleon Resonance Region in the Exclusive $$\vec{e}p \to e'K^+\vec{\Lambda}$$ and $$\vec{e}p \to e'K^+\vec{\Sigma}^0$$ Reactions at CLAS
Journal Article
·
· Physical Review C
Beam-recoil transferred polarizations for the exclusive $$\vec{e}p \to e'K^+ \vec{\Lambda},\vec{\Sigma}^0$$ reactions have been measured using the CLAS spectrometer at Jefferson Laboratory. New measurements have been completed at beam energies of 4.261 and 5.754~GeV that span a range of momentum transfer $Q^2$ from 0.7 to 5.4~GeV$^2$, invariant energy $$W$$ from 1.6 to 2.6~GeV, and the full center-of-mass angular range of the $K^+$ meson. These new data add to the existing CLAS $$K^+\Lambda$$ measurements at 2.567~GeV, and provide the first-ever data for the $$K^+\Sigma^0$$ channel in electroproduction. Comparisons of the data with several theoretical models are used to study the sensitivity to $$s$$-channel resonance contributions and the underlying reaction mechanism. Interpretations within two semi-classical partonic models are made to probe the underlying reaction mechanism and the $$s\bar{s}$$ quark-pair creation dynamics.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 978845
- Report Number(s):
- JLAB-PHY-09-967; DOE/OR/23177-0679
- Journal Information:
- Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 79
- Country of Publication:
- United States
- Language:
- English
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