The influence of Fermi motion on the comparison of the polarization transfer to a proton in elastic e→p and quasi-elastic e→A scattering - INSPIRE

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The influence of Fermi motion on the comparison of the polarization transfer to a proton in elastic e→p and quasi-elastic e→A scattering

A1

Collaboration

•

S. Paul

Jan 30, 2019

5 pages

Published in:

Phys.Lett.B 792 (2019) 445-449

Published: May 10, 2019

e-Print:

1901.10958 [nucl-ex]

DOI:

10.1016/j.physletb.2019.04.004 (publication)

View in:

ADS Abstract Service

reference search6 citations

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Abstract: (Elsevier)

A comparison between polarization-transfer to a bound proton in quasi-free kinematics by the A (e→,e′p→) knockout reaction and that in elastic scattering off a free proton can provide information on the characteristics of the bound proton. In the past the reported measurements have been compared to those of a free proton with zero initial momentum. We introduce, for the first time, expressions for the polarization-transfer components when the proton is initially in motion and compare them to the 2 H data measured at the Mainz Microtron (MAMI). We show the ratios of the transverse ( Px ) and longitudinal ( Pz ) components of the polarization transfer in H2(e→,e′p→)n , to those of elastic scattering off a “moving proton”, assuming the proton's initial (Fermi-motion) momentum equals the negative missing momentum in the measured reaction. We found that the correction due to the proton motion is up to 20% at high missing momentum. However the effect on the double ratio (Px/Pz)A(Px/Pz)H1 is largely canceled out, as shown for both 2 H and 12 C data. This implies that the difference between the resting- and the moving-proton kinematics is not the primary cause for the deviations between quasi-elastic and elastic scattering reported previously.

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Figures(6)

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