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Test for universality of short-range correlations in pion-induced Drell-Yan Process

Fei Huang, Shu-Man Hu, De-Min Li, Ji Xu

TL;DR

This work investigates the connection between the EMC effect and nucleon-nucleon short-range correlations (SRC) in the pion-induced Drell-Yan process. It defines a nuclear modification ratio R(dDY;x2,Q2) and shows that the K-factor cancels in ratios, using EPPS21 nPDFs and xFitterPI_NLO_EIG pions to quantify nuclear modifications in the EMC region. By modeling SRC-based modifications to proton PDFs in nuclei and introducing a universal modification function RM(dDY;x2,Q2), the authors demonstrate that the nuclear dependence largely collapses after SRC normalization, supporting SRC universality in the EMC region 0.3≤x2≤0.7. The framework yields testable predictions for future experiments at the EIC and AMBER, advancing our understanding of nuclear structure and strong interactions.

Abstract

We investigate nuclear modification and the universality of short-range correlation (SRC) in pion-induced Drell-Yan process. Employing nuclear parton distribution functions (nPDFs) and pion PDFs, the ratio of differential cross sections of different nuclei relative to the free nucleon is presented. A kind of universal modification function was proposed which would provide nontrivial tests of SRC universality on the platform of pion-induced Drell-Yan. This work improves our understanding of nuclear structure and strong interactions.

Test for universality of short-range correlations in pion-induced Drell-Yan Process

TL;DR

This work investigates the connection between the EMC effect and nucleon-nucleon short-range correlations (SRC) in the pion-induced Drell-Yan process. It defines a nuclear modification ratio R(dDY;x2,Q2) and shows that the K-factor cancels in ratios, using EPPS21 nPDFs and xFitterPI_NLO_EIG pions to quantify nuclear modifications in the EMC region. By modeling SRC-based modifications to proton PDFs in nuclei and introducing a universal modification function RM(dDY;x2,Q2), the authors demonstrate that the nuclear dependence largely collapses after SRC normalization, supporting SRC universality in the EMC region 0.3≤x2≤0.7. The framework yields testable predictions for future experiments at the EIC and AMBER, advancing our understanding of nuclear structure and strong interactions.

Abstract

We investigate nuclear modification and the universality of short-range correlation (SRC) in pion-induced Drell-Yan process. Employing nuclear parton distribution functions (nPDFs) and pion PDFs, the ratio of differential cross sections of different nuclei relative to the free nucleon is presented. A kind of universal modification function was proposed which would provide nontrivial tests of SRC universality on the platform of pion-induced Drell-Yan. This work improves our understanding of nuclear structure and strong interactions.
Paper Structure (5 sections, 18 equations, 3 figures)

This paper contains 5 sections, 18 equations, 3 figures.

Table of Contents

  1. introduction
  2. ratio factor in Drell-Yan
  3. the universality of SRC
  4. Summary
  5. Acknowledgements

Figures (3)

  • Figure 1: Comparison between the contributions from the nucleon's antiquark and quark distributions in Eq. (\ref{['Drell-Yan']}). The kinematics is chosen at $Q^2=25\,\textrm{GeV}^2$ and $\sqrt{s}=21.8\,\textrm{GeV}$.
  • Figure 2: The ratio factors $R(d\sigma^{DY};x_2,Q^2)$ as a function of $x_2$ with $Q^2=25\,\textrm{GeV}^2$. The different color corresponds to different nuclei.
  • Figure 3: The shape of universal modification functions $R_M(d\sigma^{DY};x_2,Q^2)$ with $Q^2=25\,\textrm{GeV}^2$. The different color corresponds to different nuclei.