Phys. Rev. C 72, 014602 (2005) [8 pages]Influence of the Dirac sea on proton electromagnetic knockoutReceived 1 February 2005; published 7 July 2005 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 16O with 0.2≤Q2≤0.8 and 12C 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 Gordon 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 calculations, but at Q2=1.8 (GeV/c)2 the observed variation with missing momentum is flatter than predicted. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.72.014602
DOI:
10.1103/PhysRevC.72.014602
PACS:
25.30.Dh, 24.10.Jv
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