期刊
PHYSICAL REVIEW C
卷 90, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.90.035202
关键词
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资金
- Florida International University Dissertation Year Fellowship
- Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
- Italian Istituto Nazionale di Fisica Nucleare
- French Centre National de la Recherche Scientifique
- French Commissariat a l'Energie Atomique
- US Department of Energy
- National Science Foundation
- Scottish Universities Physics Alliance (SUPA)
- United Kingdom's Science and Technology Facilities Council
- National Research Foundation of Korea
- Thomas Jefferson National Accelerator Facility for the United States Department of Energy [DE-AC05-06OR23177]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205782] Funding Source: National Science Foundation
- Science and Technology Facilities Council [1264251, ST/L005719/1, 1511780, ST/J000175/1] Funding Source: researchfish
- STFC [ST/J000175/1, ST/L005719/1] Funding Source: UKRI
We have measured. the induced polarization of the Lambda(1116) in the reaction ep -> e' K+ Lambda, detecting the scattered e' and K+ in the final state along with the proton from the decay Lambda -> p pi(-). The present study used the CEBAF Large Acceptance Spectrometer (CLAS), which allowed for a large kinematic acceptance in invariant energy W (1.6 <= W <= 2.7 GeV) and covered the full range of the kaon production angle at an average momentum transfer Q(2) = 1.90 GeV2. In this experiment a 5.50-GeV electron beam was incident upon an unpolarized liquid-hydrogen target. We have mapped out the W and kaon production angle dependencies of the induced polarization and found striking differences from photoproduction data over most of the kinematic range studied. However, we also found that the induced polarization is essentially Q(2) independent in our kinematic domain, suggesting that somewhere below the Q(2) covered here there must be a strong Q(2) dependence. Along with previously published photo-and electroproduction cross sections and polarization observables, these data are needed for the development of models, such as effective field theories, and as input to coupled-channel analyses that can provide evidence of previously unobserved s-channel resonances.
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