Date of Award

Spring 2017

Document Type


Degree Name

Doctor of Philosophy (PhD)



Committee Director

Moskov Amaryan

Committee Member

Charles Hyde

Committee Member

Sylvain Marsillac

Committee Member

Anatoly Radyushkin

Committee Member

Charles Sukenik


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+πγ 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+πγ). 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+πη 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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