Polarization Transfer in theHe4(e→,e′p→)H3Reaction up toQ2=2.6(GeV/c)2

We have measured the proton recoil polarization in the ${}^4\mathrm{H}\mathrm{e}(\overrightarrow{e},e^{\prime }\overrightarrow{p}){}^4\mathrm{H}$ reaction at $Q^2=0.5$, 1.0, 1.6, and $2.6(\mathrm{G}\mathrm{e}\mathrm{V}/c{)}^2$. The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model. In addition, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.