Sensitivity of exclusive proton knockout spin observables to different Lorentz invariant representations of the NN interaction

Within the framework of the relativistic plane wave impulse approximation, we study the observable consequences of employing a complete Lorentz invariant representation of the nucleon-nucleon (AW) scattering matrix in terms of 44 independent amplitudes, as opposed to the previously employed, but ambiguous, five-term Lorentz invariant parametrization of the NN scattering matrix, for the prediction of complete sets of exclusive (p^→, 2p ^→) polarization transfer observables. Two kinematic conditions are considered, namely, proton knockout from the 3s_1/2 state of ²⁰⁸Pb at an incident energy of 202 MeV for coplanar scattering angles (28.0°,-54.6°), as well as an incident energy of 392 MeV for the angle pair (32.5°,-80.0°). The results indicate that certain spin observables are ideal for discriminating between the two representations.