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Frascati 22 GeV Workshop Summary

A. Accardi, P. Achenbach, A. Afanasev, M. Albrecht, A. C. Alvaro, J. Arrington, H. Avakian, P. Barry, A. Bashir, M. Bashkanov, M. Battaglieri, S. A. Bogacz, M. Boglione, M. Bondi, V. D. Burkert, C. E. Carlson, D. S. Carman, A. Celentano, M. Cerutti, J. -P. Chen, I. Cloet, M. Contalbrigo, A. D'Angelo, L. Darme, E. De Sanctis, R. De Vita, D. J. Dean, F. Delcarro, O. Denisov, A. Deur, P. Di Nezza, C. Dilks, S. Dobbs, R. Dupre, D. Dutta, A. El Alaoui, L. El Fassi, L. Elouadrhiri, A. Filippi, N. Fomin, L. Gan, D. Gaskell, D. I. Glazier, S. Gonzalez-Solis, R. W. Gothe, F. -K. Guo, N. Hammoud, T. B. Hayward, G. M. Huber, N. Husken, N. Kalantarians, W. Y. Ke, C. Keppel, A. Kotzinian, C. H. Leung, S. Li, A. Lung, B. McKinnon, T. Mineeva, M. Mirazita, V. I. Mokeev, G. Montana, R. Montgomery, P. Moran, C. Munoz Camacho, S. Nakamura, G. Niculescu, I. Niculescu, M. Nycz, A. Osmond, M. Ouillon, R. Paremuzyan, B. Parsamyan, L. Pentchev, R. Perrino, A. Pilloni, L. Polizzi, J. W. Qiu, M. Radici, K. Raya, M. Rinaldi, C. D. Roberts, L. Rossi, P. Rossi, N. Santiesteban, M. Sargsian, N. Sato, S. Schadmand, M. R. Shepherd, K. Shirotori, A. Simonelli, M. Spreafico, J. R. Stevens, A. Szczepaniak, H. Szumila-Vance, A. Tadepalli, Y. Tian, A. Tyler, S. Vallarino, T. Vittorini, C. Weiss, D. Winney, Z. Ye, T. Yushkevych, M. Zaccheddu, Y. Zhou

Abstract

This document summarizes the outcomes of the "Science at the Luminosity Frontier: Jefferson Lab at 22 GeV" workshop, held at the INFN Laboratori Nazionali di Frascati in December 2024. The primary goal of the workshop was to critically assess and refine the scientific case for a proposed energy upgrade of the Continuous Electron Beam Accelerator Facility (CEBAF) to 22 GeV. This document intends to capture the progress on developing the scientific case since the publication of a lengthy "White Paper" in summer 2024 signed by about 450 authors.

Frascati 22 GeV Workshop Summary

Abstract

This document summarizes the outcomes of the "Science at the Luminosity Frontier: Jefferson Lab at 22 GeV" workshop, held at the INFN Laboratori Nazionali di Frascati in December 2024. The primary goal of the workshop was to critically assess and refine the scientific case for a proposed energy upgrade of the Continuous Electron Beam Accelerator Facility (CEBAF) to 22 GeV. This document intends to capture the progress on developing the scientific case since the publication of a lengthy "White Paper" in summer 2024 signed by about 450 authors.
Paper Structure (34 sections, 2 equations, 31 figures)

This paper contains 34 sections, 2 equations, 31 figures.

Table of Contents

  1. Introduction
  2. Meson Spectroscopy
  3. Hadron Structure
  4. Reconstruction of Pion and Kaon Structure from Global QCD Analysis
  5. $d/u$ Ratio at Large $x$
  6. Light Quark Sea in the Intermediate-$x$ Region
  7. Precision Measurement of QCD Strong Coupling
  8. Meson Structure with TDIS
  9. Pion Electroproduction at Very High Transverse Momenta
  10. Kaon Semi-Inclusive Deep Inelastic Scattering
  11. The Sivers Effect
  12. Back-to-Back Hadron Production and "$\rho$-Free" SIDIS
  13. Extracting Flavor Dependence of TMDs
  14. Probing the Transverse Momentum of Longitudinally Polarized Quarks
  15. Spatial Structure and Mechanical Properties
  16. ...and 19 more sections

Figures (31)

  • Figure 1: Current landscape of conventional $c\bar{c}$ charmonium states and $X,Y,Z$, as well as pentaquark states included in the Particle Data Group listings ParticleDataGroup:2024cfk. Figure from Ref. JPAC:2021rxu.
  • Figure 2: Splitting functions for the pion (left) and kaon (right) as a function of momentum transfer squared $t$ over various models in the region of experimental applicability for $\bar{x}_L=0.15$, where $\bar{x}_L$ is the fraction of the proton momentum carried by the virtual meson.
  • Figure 3: Relative PDF uncertainty ratios for $u$ (left) and $d/u$ (right) at $Q^2 = 10$ GeV$^2$, defined as the ratio of uncertainties including JLab 22 GeV pseudo-data to those from the CJ22ht baseline fit (CJ, in the legend): $\delta u / \delta u_{\mathrm{CJ}}$ and $\delta (d/u) / \delta (d/u)_{\mathrm{CJ}}$. The impact is especially pronounced at large $x$, with uncertainties reduced by 20--40% in $u$ and $d/u$.
  • Figure 4: (Left) Projected statistical uncertainties for pion $A_{LL}$ measurements with a polarized $^3\text{He}$ target with 100 PAC days using the SoLID spectrometer. (Right) Projected impact of the SoLID measurements on the sea quark helicity distribution using leading-order formalism and comparisons with extractions from COMPASS COMPASS:2010hwr. The bands represent the 68% confidence level of NNPDFpol1.1 nocera2014.
  • Figure 5: Higher-order multiple-loop corrections to the running of the strong coupling are shown relative to the leading-order baseline. Uncertainties on $\alpha_s$ from the world data are shown by the black error bars, while the expected uncertainties from EIC and JLab at 22 GeV + EIC are shown by the blue and red error bars, respectively.
  • ...and 26 more figures