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Polarization Transfer in the 4He(e,e'p)3H Reaction at Q² = 0.8 and 1.3 (GeV/c)²

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arxiv 1002.2188 v8 pith:FVKZO7PY submitted 2010-02-10 nucl-ex

Polarization Transfer in the 4He(e,e'p)3H Reaction at Q² = 0.8 and 1.3 (GeV/c)²

classification nucl-ex
keywords protonreactionpolarizationpolarization-transferapproximationcharge-exchangecoefficientscontradicting
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Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3H reaction at Q^2 = 0.8 (GeV/c)^2 and 1.3 (GeV/c)^2 with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e,e' p) reaction, contradicting a relativistic distorted-wave approximation, and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.

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