Measurement of double-polarization asymmetries in the quasi-elastic ${}^3\overrightarrow{\mathrm{He}}(\vec{\mathrm{e}},{\mathrm{e}}^{\prime }\mathrm{d})$ process

Abstract

We present a precise measurement of double-polarization asymmetries in the ${}^3\overrightarrow{\mathrm{He}}(\vec{\mathrm{e}},{\mathrm{e}}^{\prime }\mathrm{d})$ reaction. This particular process is a uniquely sensitive probe of hadron dynamics in ${}^3\mathrm{He}$ and the structure of the underlying electromagnetic currents. The measurements have been performed in and around quasi-elastic kinematics at $Q^2=0.25(\mathrm{GeV}/c{)}^2$ for missing momenta up to $270\mathrm{MeV}/c$. The asymmetries are in fair agreement with the state-of-the-art calculations in terms of their functional dependencies on $p_{\mathrm{m}}$ and $\omega$, but are systematically offset. Beyond the region of the quasi-elastic peak, the discrepancies become even more pronounced. Thus, our measurements have been able to reveal deficiencies in the most sophisticated calculations of the three-body nuclear system, and indicate that further refinement in the treatment of their two- and/or three-body dynamics is required.

arXiv comment6 pages, 4 figures, accepted for publication at Phys. Rev. Lett

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Cited by in corpus (7)

• Nucleon-Nucleon Correlations, Short-lived Excitations, and the Quarks Within
• New Results on Short-Range Correlations in Nuclei
• Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements
• Measurement of the single-spin asymmetry $A_y^0$ in quasi-elastic ${}^3$He${}^{\uparrow }$($e,e^{\prime }n$) scattering at $0.4<Q^2<1.0$ GeV$/c^2$
• Measurement of double-polarization asymmetries in the quasi-elastic ${}^3\overrightarrow{\mathrm{He}}(\vec{\mathrm{e}},{\mathrm{e}}^{\prime }\mathrm{p})$ process
• Signatures of the $\Delta$ isobar in spin observables of ${}^3\mathrm{He}$ electrodisintegration
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