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Isovector EMC effect from global QCD analysis with MARATHON data
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abstract
We report the results of a Monte Carlo global QCD analysis of unpolarized parton distribution functions (PDFs), including for the first time constraints from ratios of $^3$He to $^3$H structure functions recently obtained by the MARATHON experiment at Jefferson Lab. Our simultaneous analysis of nucleon PDFs and nuclear effects in $A=2$ and $A=3$ nuclei reveals the first indication for an isovector nuclear EMC effect in light nuclei. We find that while the MARATHON data yield relatively weak constraints on the $F_2^n/F_2^p$ neutron to proton structure function ratio and on the $d/u$ PDF ratio, they suggest an enhanced nuclear effect on the $d$-quark PDF in the bound proton, questioning the assumptions commonly made in nuclear PDF analyses.
Forward citations
Cited by 2 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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First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints
First simultaneous pion+kaon PDF fit with lattice constraints finds kaon valence anti-up softer than pion's and strange valence more peaked at high x.
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