Publications
Publication Information
| Title | Beam-spin asymmetry of deeply virtual Compton scattering off the proton at 10.6 GeV with CLAS12 at Jefferson Laboratory |
| Authors | Guillaume Christiaens |
| JLAB number | JLAB-PHY-21-3563 |
| LANL number | (None) |
| Other number | (None) |
| 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) : Sokhan Daria (GLASGOW) Defurne Maxime (CEA SACLAY) | |
| Publication Abstract: | This thesis presents the measurements of beam-spin asymmetry (BSA) of deeply virtual Compton scattering (DVCS) off the proton at 10.6 GeV with the CLAS12 spectrometer at Jefferson Laboratory. This data will provide, in the valence region, high energy DVCS measurements, to help constrain nucleon structure physics models. The data used in this thesis was taken at Jefferson Laboratory (Virginia, USA). The CLAS12 spectrometer, installed in the experimental hall B, receives a longitudinally polarized electron beam accelerated to up to 10.6 GeV. CLAS12 provides the identification and reconstruction of the particles obtained from the interaction of the electron beam with a fixed liquid hydrogen target. Micromegas detectors were used to improve the tracking resolution within the CLAS12 spectrometer. This thesis provides a description of the assembly, integration and operation of Micromegas detectors. The integration of the Micromegas detectors with the other CLAS12 subsystems, the integration of the gas and software systems as well as tests and studies performed during the commissioning are detailed. In this thesis, the DVCS process was extracted from the data collected by CLAS12 and the BSA was computed. The emphasis was put on the exclusive selection of DVCS signal and the estimation of the ? 0 electroproduction background. The DVCS exclusivity variables and the positions of the exclusivity cuts were optimized to reduce the ? 0 electroproduction background and the remaining contamination was estimated from a Monte-Carlo simulation. The BSA was extracted for 240 kinematic bins with: ten ? bins, four t bins, three xB bins and two Q 2 bins. |
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| Group: | Hall B |
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