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Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3Hreaction 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 the1H(e,e' p) reaction, contradicting a relativistic distorted-wave approximation,and favoring either the inclusion of medium-modified proton form factorspredicted by the quark-meson coupling model or a spin-dependent charge-exchangefinal-state interaction. For the first time, the polarization-transfer ratio isstudied as a function of the virtuality of the proton.

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