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Robust extraction of power corrections and nuclear dynamics from DIS at large $x$

Alberto Accardi, Matteo Cerutti

TL;DR

The paper tackles the challenge of disentangling power corrections and nuclear dynamics in DIS at large $x$ to reliably extract flavor-separated PDFs. It analyzes the interplay between higher-twist (HT) terms and off-shell nucleon corrections, showing that isospin-dependent HT implementations are necessary to avoid biases in the $n/p$ ratio and the off-shell function $\delta f(x)$. CJ25 extends the CJ22ht framework by incorporating the full Jefferson Lab 6 GeV inclusive DIS dataset, yielding tighter constraints on the proton HT function $C_p(x)$ and reducing uncertainties, with modest impact on leading-twist quantities. The authors anticipate that forthcoming JLab 12 GeV data and BONuS measurements will further sharpen the separation of HT and off-shell effects, enhancing our understanding of nuclear dynamics in light nuclei and improving large-$x$ parton-nucleon physics.

Abstract

We present recent updates from the CTEQ-JLab (CJ) global PDF analysis, focusing on the interplay and implementation systematics of the HT and offshell correction (CJ22ht). We also discuss preliminary results of the CJ25 global analysis, showing the impact of the full JLab 6 GeV datasets, that we recently collected in a comprehensive DIS database, and having a first look at early JLab 12 GeV measurements. We finally offer a few thoughts on how future data may help unraveling the nuclear and partonic dynamics in light nuclei.

Robust extraction of power corrections and nuclear dynamics from DIS at large $x$

TL;DR

The paper tackles the challenge of disentangling power corrections and nuclear dynamics in DIS at large to reliably extract flavor-separated PDFs. It analyzes the interplay between higher-twist (HT) terms and off-shell nucleon corrections, showing that isospin-dependent HT implementations are necessary to avoid biases in the ratio and the off-shell function . CJ25 extends the CJ22ht framework by incorporating the full Jefferson Lab 6 GeV inclusive DIS dataset, yielding tighter constraints on the proton HT function and reducing uncertainties, with modest impact on leading-twist quantities. The authors anticipate that forthcoming JLab 12 GeV data and BONuS measurements will further sharpen the separation of HT and off-shell effects, enhancing our understanding of nuclear dynamics in light nuclei and improving large- parton-nucleon physics.

Abstract

We present recent updates from the CTEQ-JLab (CJ) global PDF analysis, focusing on the interplay and implementation systematics of the HT and offshell correction (CJ22ht). We also discuss preliminary results of the CJ25 global analysis, showing the impact of the full JLab 6 GeV datasets, that we recently collected in a comprehensive DIS database, and having a first look at early JLab 12 GeV measurements. We finally offer a few thoughts on how future data may help unraveling the nuclear and partonic dynamics in light nuclei.

Paper Structure

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

Table of Contents

  1. Introduction
  2. Interplay of higher-twist and off-shell corrections
  3. New insights from JLab data

Figures (3)

  • Figure 1: Results of the CJ22 analyses with isospin-independent ($p=n$) additive (orange band) or multiplicative (blue band) HT corrections. Left panel: $n/p$ ratio of $F_2$ structure functions at $Q^2=10$ GeV$^2$. Central panel: offshell function. Right panel: $D/p$ ratio at $Q^2=10$ GeV$^2$ compared to a selection of experimental data. Bands represent $T^2=2.7$ uncertainties (see Ref. Accardi:2015lcq for more details).
  • Figure 2: Comparison of the isospin-dependent ($p\neq n$) additive (green band) or multiplicative (purple band) implementation of the HT corrections in the CJ global analysis. Other details as in Fig. \ref{['f:Res_HTindep']}.
  • Figure 3: Comparison between extracted quantities from baseline fit (dashed empty bands) and fit including JLab 6 data (blue bands). Left panel: $d/u$ PDF ratio at $Q^2=Q_0^2=1.69$ GeV$^2$. Central panel: proton HT function $C_p$; right panel: offshell function $\delta f$. Error bands account for $T^2=2.7$ uncertainties.