{"id":{"repo_id":"rice","oai_identifier":"oai:repository.rice.edu:1911/16699"},"canonical_url":"https://search.dev.ndltd.org/etd/rice/oai:repository.rice.edu:1911/16699","repository":{"repo_id":"rice","name":"Rice University","base_url":"https://repository.rice.edu/server/oai/request"},"display":{"title":"A study of photon-nucleus collisions at high transverse energy","abstract":"We have measured, for the first time, the atomic number dependence of photon-nucleus collisions at high transverse energy. The measurements were made at FNAL by using a large acceptance calorimeter with 50-400 GeV photons incident on LH$\\sb2,$ LD$\\sb2,$ Be, C, Al, Cu, Sn and Pb targets. The cross section is parameterized as $\\sigma\\sb{\\gamma A} = \\sigma\\sb{\\gamma p}A\\sp\\alpha,$ where $\\alpha$ is found to increase from 0.9 to 1.1 when the total transverse energy $E\\sb{T}$ is increased from roughly 6 GeV to 12 GeV; $\\alpha$ is also found to increase with the photon energy at fixed $x\\sb{T}\\equiv E\\sb{T}/\\sqrt{s},$ but depends only weakly on the photon energy at fixed $E\\sb{T}.$ The increase of $\\alpha$ with total transverse energy is qualitatively consistent with previous measurements from the hadron-nucleus collisions, but our $\\alpha$ values are somewhat lower. At high transverse energy, photon induced collisions are found to be more jet-like than pion induced collisions, revealing the point-like nature of the photons at high $E\\sb{T}.$ The mean planarity in $\\gamma A$ collisions is independent of A in the kinematic range covered by this experiment.","abstract_html":"We have measured, for the first time, the atomic number dependence of photon-nucleus collisions at high transverse energy. The measurements were made at FNAL by using a large acceptance calorimeter with 50-400 GeV photons incident on LH$\\sb2,$ LD$\\sb2,$ Be, C, Al, Cu, Sn and Pb targets. The cross section is parameterized as <span class=\"etd-inline-math\">&sigma;\\sb{&gamma; A} = &sigma;\\sb{&gamma; p}A\\sp&alpha;,</span> where <span class=\"etd-inline-math\">&alpha;</span> is found to increase from 0.9 to 1.1 when the total transverse energy $E\\sb{T}$ is increased from roughly 6 GeV to 12 GeV; <span class=\"etd-inline-math\">&alpha;</span> is also found to increase with the photon energy at fixed $x\\sb{T}\\equiv E\\sb{T}/\\sqrt{s},$ but depends only weakly on the photon energy at fixed $E\\sb{T}.$ The increase of <span class=\"etd-inline-math\">&alpha;</span> with total transverse energy is qualitatively consistent with previous measurements from the hadron-nucleus collisions, but our <span class=\"etd-inline-math\">&alpha;</span> values are somewhat lower. At high transverse energy, photon induced collisions are found to be more jet-like than pion induced collisions, revealing the point-like nature of the photons at high $E\\sb{T}.$ The mean planarity in <span class=\"etd-inline-math\">&gamma; A</span> collisions is independent of A in the kinematic range covered by this experiment.","abstract_has_math":true,"creators":["Zhu, Qiuan"],"institution":"Rice University","degree_name":"Doctor of Philosophy","degree_level":"Doctoral","degree_discipline":"Natural Sciences","degree_department":null,"school":null,"contributors":[],"advisors":["Miettinen, Hannu E."],"committee_chairs":[],"committee_members":[],"year":1993,"date_issued":"1993","date_published":"1993","updated_at":"2026-07-24T04:10:17Z","subjects":["Particle physics","Elementary particles","High energy physics"],"languages":["eng"],"rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1911/16699","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Miettinen, Hannu E."]},{"key":"dc:creator","label":"Author","values":["Zhu, Qiuan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2009-06-04T00:27:15Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2009-06-04T00:27:15Z"]},{"key":"dc:date.issued","label":"Date","values":["1993"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctoral"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Rice University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Particle physics","Elementary particles","High energy physics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1911/16699"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["We have measured, for the first time, the atomic number dependence of photon-nucleus collisions at high transverse energy. The measurements were made at FNAL by using a large acceptance calorimeter with 50-400 GeV photons incident on LH$\\sb2,$ LD$\\sb2,$ Be, C, Al, Cu, Sn and Pb targets. The cross section is parameterized as $\\sigma\\sb{\\gamma A} = \\sigma\\sb{\\gamma p}A\\sp\\alpha,$ where $\\alpha$ is found to increase from 0.9 to 1.1 when the total transverse energy $E\\sb{T}$ is increased from roughly 6 GeV to 12 GeV; $\\alpha$ is also found to increase with the photon energy at fixed $x\\sb{T}\\equiv E\\sb{T}/\\sqrt{s},$ but depends only weakly on the photon energy at fixed $E\\sb{T}.$ The increase of $\\alpha$ with total transverse energy is qualitatively consistent with previous measurements from the hadron-nucleus collisions, but our $\\alpha$ values are somewhat lower. At high transverse energy, photon induced collisions are found to be more jet-like than pion induced collisions, revealing the point-like nature of the photons at high $E\\sb{T}.$ The mean planarity in $\\gamma A$ collisions is independent of A in the kinematic range covered by this experiment."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["A study of photon-nucleus collisions at high transverse energy"]}]}],"canonical_facts":{"dc:contributor.advisor":["Miettinen, Hannu E."],"dc:creator":["Zhu, Qiuan"],"dc:date.accessioned":["2009-06-04T00:27:15Z"],"dc:date.available":["2009-06-04T00:27:15Z"],"dc:date.issued":["1993"],"dc:description.abstract":["We have measured, for the first time, the atomic number dependence of photon-nucleus collisions at high transverse energy. The measurements were made at FNAL by using a large acceptance calorimeter with 50-400 GeV photons incident on LH$\\sb2,$ LD$\\sb2,$ Be, C, Al, Cu, Sn and Pb targets. The cross section is parameterized as $\\sigma\\sb{\\gamma A} = \\sigma\\sb{\\gamma p}A\\sp\\alpha,$ where $\\alpha$ is found to increase from 0.9 to 1.1 when the total transverse energy $E\\sb{T}$ is increased from roughly 6 GeV to 12 GeV; $\\alpha$ is also found to increase with the photon energy at fixed $x\\sb{T}\\equiv E\\sb{T}/\\sqrt{s},$ but depends only weakly on the photon energy at fixed $E\\sb{T}.$ The increase of $\\alpha$ with total transverse energy is qualitatively consistent with previous measurements from the hadron-nucleus collisions, but our $\\alpha$ values are somewhat lower. At high transverse energy, photon induced collisions are found to be more jet-like than pion induced collisions, revealing the point-like nature of the photons at high $E\\sb{T}.$ The mean planarity in $\\gamma A$ collisions is independent of A in the kinematic range covered by this experiment."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["https://hdl.handle.net/1911/16699"],"dc:language.iso":["eng"],"dc:rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"dc:subject":["Particle physics","Elementary particles","High energy physics"],"dc:title":["A study of photon-nucleus collisions at high transverse energy"],"dc:type":["Thesis"],"thesis:degree_discipline":["Natural Sciences"],"thesis:degree_level":["Doctoral"],"thesis:degree_name":["Doctor of Philosophy"],"thesis:institution_name":["Rice University"]},"updated_at":"2026-07-24T04:10:17Z"}