A polarization relation and the measurement of the longitudinal response in pseudoscalar meson electroproduction off the nucleon
Abstract
For pseudoscalar meson electroproduction off the nucleon in parallel kinematics a relation between three polarization observables is derived. It is shown that, without Rosenbluth separation, a measurement of the longitudinal strength can be achieved through three different ways. They are discussed with preliminary MAMI data for the p( e, e' p)π0 reaction in the energy range of the Delta(1232) resonance.
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