Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.072001
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Funding
- U.S. Department of Energy
- U.S. National Science Foundation
- DOE [DE-AC05-06OR23177]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1002644] Funding Source: National Science Foundation
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Proton recoil polarization was measured in the quasielastic He-4((e) over right arrow, e '(p) over right arrow)H-3 reaction at Q(2) = 0.8 and 1.3 (GeV/c)(2) with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the H-1((e) over right arrow, e '(p) over right arrow) 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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