Date of Award
Doctor of Philosophy (PhD)
In this work the η/ meson photoproduction cross sections as well as the distribution of the di-pion invariant mass, m(π+π−), in the radiative decay mode η/ → π+π−γ have been measured using the CLAS detector at the Thomas Jefferson National Accelerator Facility using tagged incident photons in the center-of-mass energy range 1.96 GeV - 2.72 GeV. The measurements are performed on a liquid hydrogen target in the reaction γp → pη/(η/ → π+π−γ). The analysis is based on the highest statistics collected in this decay channel in comparison to other experiments reported so far.
The η/ photoproduction cross sections measured with radiative decay are in a good agreement with results of previous publication from the same data set in CLAS obtained through η/ → π+π−η decay mode. Two free parameters, α and β, are extracted from a model-independent fit to the m(π+π−) distribution and their values are found to agree well with recent theoretical expectations. The results of both parameters confirm the existence of the box anomaly, ρ-ω mixing and effects of the a2(1320) tensor meson in the radiative decay of η/.
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Njencheu, Georgie M..
"Photoproduction and Radiative Decay of ηt Meson in CLAS at JLAB"
(2017). Doctor of Philosophy (PhD), Dissertation, Physics, Old Dominion University, DOI: 10.25777/43p5-8y73