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

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arxiv 1002.2188 v8 pith:FVKZO7PY submitted 2010-02-10 nucl-ex

M. Paolone , S.P. Malace , S. Strauch , I. Albayrak , J. Arrington , B.L. Berman , E.J. Brash , B. Briscoe
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A. Camsonne J.-P. Chen M.E. Christy E. Chudakov E. Cisbani B. Craver F. Cusanno R. Ent F. Garibaldi R. Gilman O. Glamazdin J. Glister D.W. Higinbotham C.E. Hyde-Wright Y. Ilieva C.W. de Jager X. Jiang M.K. Jones C.E. Keppel E. Khrosinkova E. Kuchina G. Kumbartzki B. Lee R. Lindgren D.J. Margaziotis D. Meekins R. Michaels K. Park L. Pentchev C.F. Perdrisat E. Piasetzky V.A. Punjabi A.J.R. Puckett X. Qian Y. Qiang R.D. Ransome A. Saha A.J. Sarty E. Schulte P. Solvignon R.R. Subudi L. Tang D. Tedeschi V. Tvaskis J.M. Udias P.E. Ulmer J.R. Vignote F.R. Wesselmann B. Wojteskhowski X. Zhan
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keywords protonreactionpolarizationpolarization-transferapproximationcharge-exchangecoefficientscontradicting
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Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3H reaction 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 the 1H(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.

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    A six-parameter extended vector meson dominance model with four rho/omega radial excitations per channel is fitted to world data on nucleon form factors, giving a moderate but physically constrained description.

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