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/.
","abstract_html":"<p>In this work the <em>η</em><em>/</em><em> </em>meson photoproduction cross sections as well as the distribution of the di-pion invariant mass, <em>m</em>(<em>π</em>+<em>π</em><em>−</em>), in the radiative decay mode <em>η</em><em>/ </em><em>→ π</em>+<em>π</em><em>−</em><em>γ </em>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 <em>γp → pη</em><em>/</em>(<em>η</em><em>/ </em><em>→ π</em>+<em>π</em><em>−</em><em>γ</em>). The analysis is based on the highest statistics collected in this decay channel in comparison to other experiments reported so far.</p> <p>The <em>η</em><em>/ </em>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 <em>η</em><em>/ </em><em>→ π</em>+<em>π</em><em>−</em><em>η </em>decay mode. Two free parameters, <em>α </em>and <em>β</em>, are extracted from a model-independent fit to the <em>m</em>(<em>π</em>+<em>π</em><em>−</em>) 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, <em>ρ</em>-<em>ω </em>mixing and effects of the <sub><em>a</em>2</sub>(1320) tensor meson in the radiative decay of <em>η</em><em>/</em>.</p>","abstract_has_math":false,"creators":["Njencheu, Georgie Mbianda"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Moskov Amaryan","Charles Hyde","Sylvain Marsillac","Anatoly Radyushkin","Charles Sukenik"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-04-01T07:00:00Z","date_published":"2017-04-01T07:00:00Z","updated_at":"2026-07-24T03:34:02Z","subjects":["Box anomaly","Gauge theory","Lagrangian","Meson","Photoproduction","Radioactive devcay","Nuclear"],"languages":[],"rights":["In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
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"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780355043921","https://digitalcommons.odu.edu/physics_etds/9"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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/.
"]},{"key":"dc:title","label":"Title","values":["Photoproduction and Radiative Decay of ηt Meson in CLAS at JLAB"]}]}],"canonical_facts":{"dc:contributor":["Moskov Amaryan","Charles Hyde","Sylvain Marsillac","Anatoly Radyushkin","Charles Sukenik"],"dc:creator":["Njencheu, Georgie Mbianda"],"dc:date.available":["2017-07-19T07:00:00Z"],"dc:description.abstract":["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/.
"],"dc:identifier":["9780355043921","https://digitalcommons.odu.edu/physics_etds/9"],"dc:rights":["In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
"],"dc:subject":["Box anomaly","Gauge theory","Lagrangian","Meson","Photoproduction","Radioactive devcay","Nuclear"],"dc:title":["Photoproduction and Radiative Decay of ηt Meson in CLAS at JLAB"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T03:34:02Z"}