Search for Proton Medium Modifications in the 4He(e,e'p)3H Reaction

Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium, including possible modification of the nucleon form factor and/or spinor. In our recently completed experiment E03-104 at Jefferson Lab we measured the proton recoil polarizat...

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Bibliographic Details
Published in:arXiv.org 2007-09
Main Authors: Strauch, S, the Jefferson Lab Hall A Collaboration
Format: Article
Language:English
Subjects:
Charge exchange
Form factors
Polarization
Protons
Quarks
Recoil
Relativism
Relativistic effects
Online Access:Get full text
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Summary:Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium, including possible modification of the nucleon form factor and/or spinor. In our recently completed experiment E03-104 at Jefferson Lab we measured the proton recoil polarization in the 4He(e,e'p)3H reaction at a Q^2 of 0.8 (GeV/c)^2 and 1.3 (GeV/c)^2 with unprecedented precision. These data complement earlier data between 0.4 and 2.6 (GeV/c)^2 from both Mainz and Jefferson Lab. The measured ratio of polarization-transfer coefficients differs from a fully relativistic calculation, favoring either the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model or strong charge-exchange final-state interactions. The measured induced polarizations agree well with the fully relativistic calculation and indicate that these strong final-state interactions may not be applicable.
ISSN:2331-8422
DOI:10.48550/arxiv.0709.4034