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New Measurements of the Deuteron to Proton F2 Structure Function Ratio
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New Measurements of the Deuteron to Proton F2 Structure Function Ratio
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Nucleon structure functions, as measured in lepton-nucleon scattering, have historically provided a critical observable in the study of partonic dynamics within the nucleon. However, at very large parton momenta it is both experimentally and theoretically challenging to extract parton distributions due to the probable onset of non-perturbative contributions and the unavailability of high precision data at critical kinematics. Extraction of the neutron structure and the d-quark distribution have been further challenging due to the necessity of applying nuclear corrections when utilizing scattering data from a deuteron target to extract free neutron structure. However, a program of experiments has been carried out recently at the energy-upgraded Jefferson Lab electron accelerator aimed at significantly reducing the nuclear correction uncertainties on the d-quark distribution function at large partonic momentum. This allows leveraging the vast body of deuterium data covering a large kinematic range to be utilized for d-quark parton distribution function extraction. We present new data from experiment E12-10-002 carried out in Jefferson Lab Hall C on the deuteron to proton cross-section ratio at large BJorken-x. These results significantly improve the precision of existing data, and provide a first look at the expected impact on quark distributions extracted from global parton distribution function fits.
Forward citations
Cited by 3 Pith papers
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Isospin dependence of nuclear EMC effect from global QCD analysis
Nucleon parton distributions must include off-shell (binding) corrections to describe A=2,3 DIS data, with evidence for an isovector component that changes the extracted nuclear EMC ratios.
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CJ26 Global QCD Analysis with Large-$x$ Jefferson Lab 6 and 12 GeV Data
CJ26 global NLO QCD fit incorporates JLab 6 and 12 GeV DIS data to reduce uncertainties on large-x n/p and d/u ratios by 30-50% and 5-10%.
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Stability of parton distributions at high $x$: impact of nuclear and power corrections
Global fit finds u and d PDFs stable to x≈0.8 with positive isospin-independent higher-twist corrections and nonzero off-shell nucleon contributions required to describe nuclear data.
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