Color Transparency $(CT)$ is a unique prediction of Quantum Chromodynamics $(QCD)$ where the final (and/or initial) state interactions of hadrons with the nuclear medium are suppressed for exclusive processes at high momentum transfers. While this phenomenon has been observed for mesons, there has never been a conclusive observation for baryons. A clear signal of $CT$ for baryons would be the first evidence of baryons fluctuating to a small size in the nucleus, and the onset would show the transition from nucleon-meson picture to quark-gluon degrees of freedom. The experiment $E1206107$, searching for the onset of $CT$ in protons was completed in $Hall ~C$ at Jefferson Laboratory $(JLab)$ using the upgraded $12 ~GeV ~e^{-}$ beam. It used the High Momentum Spectrometer $(HMS)$ and the new Super High Momentum spectrometer $(SHMS)$ in coincidence to measure the $e+^{12}C \longrightarrow e'+p+X$ reaction in quasi-elastic kinematics. Data were collected on a $^{12}C$ target over the range of $Q^2=8-14.3~(GeV/c)^{2}$, covering the region where a previous $p+A \longrightarrow p'+p+X$ experiment at Brookhaven National Laboratory $(BNL)$ had observed an enhancement. Proton Transparency (PT) was extracted from these data. A rise in the $PT$ as a function of $Q^2$ (defined as the square of the negative of the 4-momentum transfer by the scattered electron) is predicted to be a signature of the onset of $CT$. Our data showed no significant increase and consistent with the traditional nuclear physics calculation. This \MakeLowercase{\doctype} discusses the theory and implementation of the $CT$ experiment, summarizes the data analysis and presents results on hydrogen normalization and nuclear transparency.
| Identifer | oai:union.ndltd.org:MSSTATE/oai:scholarsjunction.msstate.edu:td-6378 |
| Date | 10 December 2021 |
| Creators | Bhetuwal, Deepak Kumar |
| Publisher | Scholars Junction |
| Source Sets | Mississippi State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Theses and Dissertations |
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