Influence of the Dirac sea on proton electromagnetic knockout
James J. Kelly
Abstract
We use the relativistic distorted-wave impulse approximation (RDWIA) to study the effects of negative-energy components of Dirac wave functions on the left-right asymmetry for (e,e'p) reactions on 16-O with 0.2 < Q2 < 0.8 and 12-C with 0.6 < Q2 < 1.8 (GeV/c)2. Spinor distortion is more important for the bound state than for the ejectile and the net effect decreases with Q2. Spinor distortion breaks Godon equivalence and the data favor the CC2 operator with intermediate coupling to the sea. The left-right asymmetry for Q2 < 1.2 (GeV/c)2 is described well by RDWIA calcuations, but at Q2 = 1.8 (GeV/c)2 the observed variation with missing momentum is flatter than predicted.
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