Cross sections were measured for the reaction 1H(e, e′π+) n at the energy W = 1.95 GeV and momentum transfer Q2 = 0.6 (GeV/c)2. At this W and Q2, the longitudinal cross section is dominated by t-channel production, giving a unique opportunity to examine the strong coupling form factor gπNN(t). The measured cross sections were separated using a method similar to a Rosenbluth separation. For the extraction of gπNN(t), the Actor and Körner model [42] and a parameterization of the MAID2000 model [3] were employed to fit the longitudinal cross section. Three parameterizations gπNN(t) were used in both models. These fits resulted in a strong coupling constant gπNN[m2π] that is consistent with theoretical predictions. However, this coupling constant leads to a cutoff parameter that is less than 1 GeV.
","abstract_html":"<p>Cross sections were measured for the reaction <sup>1</sup><em>H</em>(<em>e, e</em>′π+)<em> n</em> at the energy <em>W</em> = 1.95 GeV and momentum transfer <em>Q</em><sup>2</sup> = 0.6 (GeV/c)<sup>2</sup>. At this <em>W</em> and <em>Q</em><sup>2</sup>, the longitudinal cross section is dominated by t-channel production, giving a unique opportunity to examine the strong coupling form factor <em>g</em>π<em>NN</em>(<em>t</em>). The measured cross sections were separated using a method similar to a Rosenbluth separation. For the extraction of <em>g</em>π<em>NN</em>(<em>t</em>), the Actor and Körner model [42] and a parameterization of the MAID2000 model [3] were employed to fit the longitudinal cross section. Three parameterizations <em>g</em>π<em>NN</em>(<em>t</em>) were used in both models. These fits resulted in a strong coupling constant <em>g</em>π<em>NN</em>[m<sup>2</sup>π] that is consistent with theoretical predictions. However, this coupling constant leads to a cutoff parameter that is less than 1 GeV.</p>","abstract_has_math":false,"creators":["Vansyoc, Kelly Gene"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Andreas Klein","David Mack","Gail Dodge","Mark Havey","Linda Vahala"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2001,"date_issued":"2001-07-01T07:00:00Z","date_published":"2001-07-01T07:00:00Z","updated_at":"2026-07-24T03:35:30Z","subjects":["Pions","Cross sections","T-channel","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":["9780493565903","https://digitalcommons.odu.edu/physics_etds/119"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Cross sections were measured for the reaction 1H(e, e′π+) n at the energy W = 1.95 GeV and momentum transfer Q2 = 0.6 (GeV/c)2. At this W and Q2, the longitudinal cross section is dominated by t-channel production, giving a unique opportunity to examine the strong coupling form factor gπNN(t). The measured cross sections were separated using a method similar to a Rosenbluth separation. For the extraction of gπNN(t), the Actor and Körner model [42] and a parameterization of the MAID2000 model [3] were employed to fit the longitudinal cross section. Three parameterizations gπNN(t) were used in both models. These fits resulted in a strong coupling constant gπNN[m2π] that is consistent with theoretical predictions. However, this coupling constant leads to a cutoff parameter that is less than 1 GeV.
"]},{"key":"dc:title","label":"Title","values":["Measurement of the gπNN(t) Form Factor"]}]}],"canonical_facts":{"dc:contributor":["Andreas Klein","David Mack","Gail Dodge","Mark Havey","Linda Vahala"],"dc:creator":["Vansyoc, Kelly Gene"],"dc:date.available":["2019-10-21T07:00:00Z"],"dc:description.abstract":["Cross sections were measured for the reaction 1H(e, e′π+) n at the energy W = 1.95 GeV and momentum transfer Q2 = 0.6 (GeV/c)2. At this W and Q2, the longitudinal cross section is dominated by t-channel production, giving a unique opportunity to examine the strong coupling form factor gπNN(t). The measured cross sections were separated using a method similar to a Rosenbluth separation. For the extraction of gπNN(t), the Actor and Körner model [42] and a parameterization of the MAID2000 model [3] were employed to fit the longitudinal cross section. Three parameterizations gπNN(t) were used in both models. These fits resulted in a strong coupling constant gπNN[m2π] that is consistent with theoretical predictions. However, this coupling constant leads to a cutoff parameter that is less than 1 GeV.
"],"dc:identifier":["9780493565903","https://digitalcommons.odu.edu/physics_etds/119"],"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":["Pions","Cross sections","T-channel","Nuclear"],"dc:title":["Measurement of the gπNN(t) Form Factor"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T03:35:30Z"}