Polarization Transfer in the He4(e,ep)H3 Reaction at Q2=0.8 and 1.3(GeV/c)2

M. Paolone et al. (E03-104 Collaboration)
Phys. Rev. Lett. 105, 072001 – Published 12 August 2010

Abstract

Proton recoil polarization was measured in the quasielastic He4(e,ep)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,ep) 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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  • Received 19 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.072001

© 2010 The American Physical Society

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Vol. 105, Iss. 7 — 13 August 2010

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