Journal
CHINESE PHYSICS LETTERS
Volume 39, Issue 4, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0256-307X/39/4/041401
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Funding
- National Natural Science Foundation of China [12135007, 11805097]
- Alexander von Humboldt Foundation
- European Union [824093]
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This study investigates the ratio of structure functions between proton and neutron using precise data and a robust method, leading to a model-independent result. The consistency challenge raised by this result sheds light on the description of proton structure.
Beginning with precise data on the ratio of structure functions in deep inelastic scattering (DIS) from 3He and 3H, collected on the domain 0.19 <= x B <= 0.83, where x B is the Bjorken scaling variable, we employ a robust method for extrapolating such data to arrive at a model-independent result for the x B = 1 value of the ratio of neutron and proton structure functions. Combining this with information obtained in analyses of DIS from nuclei, corrected for target-structure dependence, we arrive at a prediction for the proton valence-quark ratio: dnu /unu q | x B -> 1 = 0.230 (57). Requiring consistency with this result presents a challenge to many descriptions of proton structure.
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