Abstract
Proton recoil polarization was measured in the quasielastic He 4(e→,e′p→)H3 reaction at Q2=0.8 and 1.3(GeV/c)2 with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the H1(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.
Original language | English |
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Article number | 072001 |
Journal | Physical Review Letters |
Volume | 105 |
Issue number | 7 |
DOIs | |
State | Published - 12 Aug 2010 |