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We give an overview of a model to describe deep-inelastic scattering (DIS) off the deuteron with a spectator proton, based on the virtual nucleon approximation (VNA). The model accounts for the final-state interactions (FSI) of the DIS debris with the spectator proton. Values of the rescattering cross section are obtained by fits to high-momentum spectator data. By using the so-called “pole extrapolation” method, free neutron structure functions can be obtained by extrapolating low-momentum spectator proton data to the on-shell neutron pole. We apply this method to the BONuS data set and find a surprising Bjorken x dependence, indicating a possible rise of the neutron to proton structure function ratio at high x.
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Tagged spectator deep-inelastic scattering off the deuteron as a tool to study neutron structure Wim Cosyn and Misak Sargsian EPJ Web of Conferences, 112 (2016) 03001 DOI: https://doi.org/10.1051/epjconf/201611203001
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