Publications
Publication Information
| Title | Beam asymmetry for photoproduced omega mesons off bound protons in deuterons |
| Authors | Olga Cortes Becerra |
| JLAB number | JLAB-PHY-18-2795 |
| LANL number | (None) |
| Other number | DOE/OR/23177-4523 |
| Document Type(s) | (Thesis) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Thesis A PHD thesis Advisor(s) : Philip Cole (Idahol State) | |
| Publication Abstract: | Quantum chromodynamics (QCD) is the fundamental theory underlying the strong interaction. Great effort has been dedicated to explain hadron interactions and the hadron composition in terms of the QCD degrees of freedom (quarks and gluons). However, this task has been largely complicated by confinement, an intrinsic
feature of QCD itself, which prevents us from a direct experimental study of the dynamics of quarks and gluons. Instead, QCD-inspired models have been developed to explain the hadron spectrum, and while there has been success in explaining important features of it, many of the states that have been predicted
by these models have not been found experimentally.
Furthermore, the hadronic spectrum is much more complicated to analyze than the atomic one because of a high number of excited states of the nucleon which have large widths that cause resonances to overlap. Also, these resonances may decay into a multitude of decay channels involving either mesons or baryons. Additionally, we will need measurements of observables, coming from polarized beam and polarized target experiments, to obtain a complete measurement of all the helicity amplitudes. My current research aims at contributing to a larger experimental program that seeks to shed light on the evolving status of the proton spectrum. I focus on the photoproduction of omega mesons off the bound proton, which is of great interest in providing information about N* resonances as omega is an isospin filter. I have extracted a preliminary quasi-free right-arrow gamma delta --> omega p(n) photon beam asymmetry polarization observable from CLAS data. The omega meson was identified through its charged decay omega --> pi^+ pi^- pi^0 where the pi^0 subsequently decays in two photons. The data were taken during the E06-103 experiment with the CLAS detector in Hall B at the Thomas Jefferson National Accelerator Laboratory (JLab). The experiment used the Hall-B Coherent Bremsstrahlung Facility to provide a high quality beam of linearly-polarized photons in the energy range from 1.1 to 2.3 GeV. |
| Experiment Numbers: | E06-103 |
| Group: | Hall B |
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