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The spectral function of He-4 is extracted from a plane-wave approximation tothe (e,e'p) reaction using a fully relativistic formalism. We take advantage ofboth an algebraic ``trick'' and a general relativistic formalism for quasifreeprocesses developed earlier to arrive at transparent, analytical expressionsfor all quasifree (e,e'p) observables. An observable is identified for theclean and model-independent extraction of the spectral function. Our simplerelativistic plane-wave calculations provide baseline predictions for therecently measured, but not yet fully analyzed, momentum distribution of He-4 bythe A1-collaboration from Mainz. Yet in spite of its simplicity, our approachpredicts momentum distributions for He-4 that rival some of the bestnonrelativistic calculations to date. Finally, we highlight some of thechallenges and opportunities that remain, both theoretically andexperimentally, in the extraction of quasifree observables.Comment: 18 pages, 4 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Extracting the spectral function of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>from a relativistic plane-wave treatment

Extracting the spectral function of4Hefrom a relativistic plane-wave treatment