Polarization-transfer measurement to a large-virtuality bound proton in the deuteron

A1 Collaboration; I. Yaron; D. Izraeli; P. Achenbach; H. Arenhövel; J. Beričič; R. Böhm; D. Bosnar; L. Debenjak; M. O. Distler; A. Esser; I. Friščić; R. Gilman; I. Korover; J. Lichtenstadt; H. Merkel; D. G. Middleton; M. Mihovilovič; U. Müller; E. Piasetzky; S. Širca; S. Strauch; J. Pochodzalla; G. Ron; B. S. Schlimme; M. Schoth; F. Schulz; C. Sfienti; M. Thiel; A. Tyukin; A. Weber

arXiv · 1602.06104

Polarization-transfer measurement to a large-virtuality bound proton in the deuteron

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Abstract

Possible differences between free and bound protons may be observed in the ratio of polarization-transfer components, $P'_x/P'_z$. We report the measurement of $P'_x/P'_z$, in the $^2\textrm{H}(\vec{e},e^{\prime}\vec{p})n$ reaction at low and high missing momenta. Observed increasing deviation of $P'_x/P'_z$ from that of a free proton as a function of the virtuality, similar to that observed in \hefour, indicates that the effect in nuclei is due to the virtuality of the knock-out proton and not due to the average nuclear density. The measured differences from calculations assuming free-proton form factors ($\sim10\%$), may indicate in-medium modifications.

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A1 Collaboration, I. Yaron, D. Izraeli, P. Achenbach, H. Arenhövel, J. Beričič, R. Böhm, D. Bosnar, L. Debenjak, M. O. Distler, A. Esser, I. Friščić, R. Gilman, I. Korover, J. Lichtenstadt, H. Merkel, D. G. Middleton, M. Mihovilovič, U. Müller, E. Piasetzky, S. Širca, S. Strauch, J. Pochodzalla, G. Ron, B. S. Schlimme, M. Schoth, F. Schulz, C. Sfienti, M. Thiel, A. Tyukin, A. Weber. 2016-02-19. Polarization-transfer measurement to a large-virtuality bound proton in the deuteron. https://arxiv.org/abs/1602.06104

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