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Overview

Welcome to the public Wiki of JLab LDRD Project LD1601/LD1701 "Nuclear gluons with charm at EIC"

The aim of the project is to demonstrate the feasibility of novel measurements of the quark and gluon densities in nuclei (A > 1) with a future Electron-Ion Collider (EIC):

• Direct measurements of nuclear gluons at x > 0.1 using heavy quark production (open charm, beauty);
• Flavor decomposition of nuclear quarks at x ~ 0.1 using semi-inclusive deep-inelastic scattering (pions, kaons).

Precise measurements of the nuclear quark and gluon densities are a key objective of nuclear physics and address fundamental questions regarding Quantum Chromodynamics (QCD) and the origin of nuclear binding. The nuclear modifications (nucleus =/= sum of A nucleons) offer insight into the presence of non-nucleonic degrees of freedom in nuclei (EMC effect, x > 0.2), the QCD structure of the nucleon-nucleon interaction (antishadowing, x ~ 0.1), and the emergence of coherent gluon fields at high energies (shadowing, x < 0.01). The proposed new measurements use information about the hadronic final state in deep-inelastic scattering and are made possible by the unique capabilities provided by EIC (collision energy, luminosity, detection of final-state hadrons).

The project is carried out in a collaborative effort of experimental and theoretical nuclear physicists. Collaborators include:

• Eugene Chudakov (JLab Physics)
• Sergey Furletov (JLab Physics)
• Doug Higinbotham (JLab Physics)
• Charles Hyde (Old Dominion University)
• Dien Nguyen (University of Virginia & JLab)
• Marco Stratmann (University at Tubingen, Germany)
• Mark Strikman (Penn State University)
• Christian Weiss (PI, JLab Theory)
• Zhihong Ye (Argonne National Lab)

The specific tasks performed are:

• Adapt simulation tools for heavy quark production in ep scattering (HVQDIS, F2c code) to eA scattering at EIC, with schematic modeling of charm detection and reconstruction
• Adapt MC tools for semi-inclusive ep DIS to eA at EIC
• Simulate nuclear ratio measurements of open charm production and semi-inclusive DIS at EIC
• Assess systematic and theoretical accuracy of nuclear ratio measurements at EIC and quantify physics impact

For information regarding specific R&D results, usage of resources, etc., please contact the investigators.

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