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→,ep→) 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.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Jun 2018


FundersFunder number
U.S. National Science Foundation
National Science FoundationPHY-1505615, 1614456, 1505615
Center for Outcomes Research and Evaluation, Yale School of Medicine
Deutsche Forschungsgemeinschaft1044
Ministry of Science, Technology and Space
Israel Academy of Sciences and Humanities
Israel Science Foundation390/15
Javna Agencija za Raziskovalno Dejavnost RSP1–0102
Hrvatska Zaklada za Znanost1680


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