Abstract
We report the first measurements of the transverse (Px and Py) and longitudinal (Pz) components of the polarization transfer to a bound proton in the deuteron via the H2(e→,e′p→) reaction, over a wide range of missing momentum. A precise determination of the electron beam polarization reduces the systematic uncertainties on the individual components to a level that enables a detailed comparison to a state-of-the-art calculation of the deuteron using free-proton electromagnetic form factors. We observe very good agreement between the measured and the calculated Px/Pz ratios, but deviations of the individual components. Our results cannot be explained by medium modified electromagnetic form factors. They point to an incomplete description of the nuclear reaction mechanism in the calculation.
Highlights
We report the first measurements of the transverse (Px and Py) and longitudinal (Pz) components of the polarization transfer to a bound proton in the deuteron via the 2H(e, e’p) reaction, over a wide range of missing momentum
The deuteron (2H) is the simplest nuclear system, with two loosely bound nucleons. Even though it is often used as a ‘free neutron’ target, measurements on the bound proton in 2H in quasi-elastic kinematics are known to have marked differences in comparison to those on a free proton [2]. Such differences can be ascribed to final state interactions (FSI) and other nuclear effects in the deuteron like meson exchange currents (MEC) and isobar configurations (IC), as well as to nuclear medium modifications of the bound proton electromagnetic form factors (FFs)
It was shown that the deviations of Px to Pz (Px/Pz) measured on a bound proton in 2H from that on a free proton, were in very good agreement with similar measurements on heavier nuclei, when using the proton virtuality as a universal parameter for these comparisons [5]
Summary
We report the first measurements of the transverse (Px and Py) and longitudinal (Pz) components of the polarization transfer to a bound proton in the deuteron via the 2H(e, e’p) reaction, over a wide range of missing momentum. Measurements of the ratio of the polarization transfer components Px to Pz (Px/Pz) to a bound proton in 2H(e, e’p) over a wide region of the proton missing momentum were reported in [3].
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