Lambda Polarization In Exclusive Electro And Photoproduction At Clas PDF Download

The CLAS collaboration at JLab has recent results on {Lambda} polarization for both electroproduction and photoproduction of K{sup +}{Lambda} exclusive states. I note the striking phenomenological trends in the data and discuss the underlying physics which might give rise to these phenomena; both in the context of an e.ective Lagrangian formalism, where the degrees of freedom are intermediate mesons and baryons, and also in the context of a simple quark picture. The quark model argument leads to the conclusion that the s and {bar s} quarks are produced with spins anti-aligned, in apparent contradiction to the popular {sup 3}P{sub 0} model of quark pair creation in which the pair is created with vacuum quantum numbers (J=0 and positive parity), i.e. in an S=1, L=1, J=0 angular momentum state.