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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isovector EMC Effect from Global QCD Analysis with MARATHON Data.

C Cocuzza1, C E Keppel2, H Liu3

  • 1Department of Physics, SERC, Temple University, Philadelphia, Pennsylvania 19122, USA.

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|December 24, 2021
PubMed
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This summary is machine-generated.

New analysis of nuclear structure functions reveals the first evidence of an isovector nuclear EMC effect in light nuclei. This finding challenges common assumptions in nuclear parton distribution function (PDF) studies.

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Area of Science:

  • Nuclear Physics
  • Quantum Chromodynamics (QCD)
  • Particle Physics

Background:

  • Parton distribution functions (PDFs) describe the structure of protons and neutrons.
  • Understanding nuclear effects on PDFs is crucial for high-energy physics.
  • Previous studies lacked precise data on light nuclei.

Purpose of the Study:

  • To perform a global QCD analysis of unpolarized PDFs.
  • To incorporate new experimental data from the MARATHON experiment.
  • To investigate nuclear effects in light nuclei (A=2 and A=3).

Main Methods:

  • Monte Carlo global QCD analysis.
  • Inclusion of structure function ratios from the MARATHON experiment (Jefferson Lab).
  • Simultaneous analysis of nucleon PDFs and nuclear effects.

Main Results:

  • First indication of an isovector nuclear EMC effect in light nuclei.
  • MARATHON data provide weak constraints on F_{2}^{n}/F_{2}^{p} and d/u PDF ratios.
  • Evidence for an enhanced nuclear effect on the d-quark PDF in bound protons.

Conclusions:

  • The study challenges standard assumptions in nuclear PDF analyses.
  • New experimental data are essential for refining our understanding of nuclear structure.
  • This work opens new avenues for exploring nucleon structure in nuclear environments.