Measurement of the single spin asymmetry and polarized structure function σLT′ in the exclusive p(e→,e′K+)Λ reaction

The single spin beam asymmetry, ALT′, and the polarized structure function, σLT′, for the p(e→,e′K+)Λ reaction in the resonance region have been measured and extracted using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Data were taken at an electron beam energy of 2.57 GeV. The large acceptance of CLAS allows for full azimuthal angle coverage over a large range of kaon center-of-mass angles. Preliminary results are presented that span a range in Q2 from 0.4 to 1.4 (GeV)2 and in W from threshold up to 2.1 GeV. Comparison to existing theoretical calculations are also presented. The fifth structure function is sensitive to the interferences between resonant and non-resonant amplitudes. This measurement is part of a larger CLAS program to measure cross sections and polarization observables for kaon electroproduction in the nucleon resonance region.