Paper detail

Nuclei as Probes of Meson-Nucleon Interactions at High and Low Energy

This dissertation explores two main topics: 1) Color Transparency and quasi-elastic knockout reactions involving pions and $ρ$ mesons; and 2) determination of the $J/ψ$-nucleon scattering amplitude and scattering length via $J/ψ$ electroproduction on the deuteron. It is shown that at the energies available at the COMPASS experiment at CERN, Color Transparency should be detectable in the reaction $π+A\to π+p+(A-1)^*$ (proton knockout). It is also shown that Color Transparency should be detectable in the electroproduction reaction $γ^*+A\toρ+p+(A-1)^*$ at small $Q^2$ (where $Q^2$ is the virtuality of the photon) but large $t$ (4-momentum transfer squared to the knocked out proton), which represents an as-yet unexplored kinematic region in the search for CT effects in electroproduction of vector mesons. Calculations are also presented for the reaction $γ^*+D\to J/ψ+p+n$ at JLab energies in order to determine the feasibility of measuring the elastic $J/ψ$-nucleon scattering amplitude and/or scattering length. It is found that it may be possible to measure the $J/ψ$-nucleon scattering amplitude at lower energies than previous measurements, but the scattering length cannot be measured.