Study of Photo-nuclear Transparency of Rho0 meson in Hall D of Jefferson Lab.

Photonuclear reactions involving real photons provide a powerful tool for investigating the fundamental aspects of Quantum Chromodynamics (QCD) within nuclear media. The E12-19-003 experiment, conducted in 2021 at Hall D of Jefferson Lab, aimed to explore the transition from hadronic to partonic degrees of freedom and investigate the predicted QCD phenomenon known as color transparency (CT) in photons, mesons, and baryons. Color transparency refers to the suppression of final-state interactions of hadrons with the nuclear medium, occurring in exclusive processes at high momentum transfer (|t|)(GeV^2). Distinct frameworks describe the strong force: at low energies through nucleon-meson degrees of freedom, and at high energies using quark-gluon degrees of freedom. This transition has never been mapped before, and CT offers a way to investigate this transition. In this presentation, I will discuss preliminary results on nuclear transparency for rho0 mesons as a function of momentum transfer |t| (GeV²) in helium and carbon targets, the key observable to investigate the onset of color transparency. I will also summarize the data analysis and the methodology used in this calculation.