{"id":{"repo_id":"ku","oai_identifier":"oai:kuscholarworks.ku.edu:1808/39413"},"canonical_url":"https://search.dev.ndltd.org/etd/ku/oai:kuscholarworks.ku.edu:1808/39413","repository":{"repo_id":"ku","name":"University of Kansas","base_url":"https://kuscholarworks.ku.edu/server/oai/request"},"display":{"title":"Studying quantum correlations and multi-hadron states using high energy quasi-real photons","abstract":"Physicists use particle accelerators to probe the fundamental structure of matter by colliding particles at energies sufficient to resolve sub-nuclear degrees of freedom. The resulting final states provide insight into the underlying dynamics of nature, enabling the discovery of new particles, the validation of theoretical frameworks, and the development of advanced technologies.","abstract_html":"Physicists use particle accelerators to probe the fundamental structure of matter by colliding particles at energies sufficient to resolve sub-nuclear degrees of freedom. The resulting final states provide insight into the underlying dynamics of nature, enabling the discovery of new particles, the validation of theoretical frameworks, and the development of advanced technologies.","abstract_has_math":false,"creators":["Gautam, Amrit"],"institution":"University of Kansas","degree_name":"Ph.D.","degree_level":null,"degree_discipline":"Physics & Astronomy","degree_department":null,"school":null,"contributors":[],"advisors":["Tapia Takaki, Daniel"],"committee_chairs":[],"committee_members":[],"year":2026,"date_issued":"2026-05-31","date_published":"2026-05-31","updated_at":"2026-07-24T02:45:19Z","subjects":["ALICE","Nuclear physics","Quantum tomography","ultra peripheral collision"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["https://www.proquest.com/LegacyDocView/DISSNUM/32703810"],"render_values":[{"text":"https://www.proquest.com/LegacyDocView/DISSNUM/32703810","href":"https://www.proquest.com/LegacyDocView/DISSNUM/32703810","code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/1808/39413","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Tapia Takaki, Daniel"]},{"key":"dc:creator","label":"Author","values":["Gautam, Amrit"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2026-07-13T22:18:20Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-07-13T22:18:20Z"]},{"key":"dc:date.issued","label":"Date","values":["2026-05-31"]},{"key":"dc:publisher","label":"Institution","values":["University of Kansas"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics & Astronomy"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["ALICE","Nuclear physics","Quantum tomography","ultra peripheral collision"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["https://www.proquest.com/LegacyDocView/DISSNUM/32703810"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1808/39413"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Physicists use particle accelerators to probe the fundamental structure of matter by colliding particles at energies sufficient to resolve sub-nuclear degrees of freedom. The resulting final states provide insight into the underlying dynamics of nature, enabling the discovery of new particles, the validation of theoretical frameworks, and the development of advanced technologies.","A central goal of modern high-energy nuclear physics is to understand the internal structure of protons and nuclei in terms of quarks and gluons, and to determine how their interactions give rise to observable properties such as mass, spin, and confinement. Of particular interest is the behavior of gluons at high energies, where their density may become sufficiently large to induce nonlinear QCD phenomena such as gluon saturation.","In this context, photon-induced reactions in ultra-peripheral collisions (UPCs) provide a powerful and complementary probe to traditional deep inelastic scattering experiments. In UPCs, the strong electromagnetic fields of relativistic ions act as intense sources of quasi-real photons, enabling the study of photon–nucleus interactions at previously inaccessible energies and extremely small Bjorken-$x$ values.","The photoproduction of vector mesons has emerged as a particularly sensitive observable for probing nuclear gluon distributions and QCD dynamics. Recent measurements indicate that nuclear effects such as shadowing and possible saturation play a significant role, although their precise interplay remains an open question.","The central goal of this thesis is to investigate these effects through the study of photoproduced multi-pion final states, with a particular focus on four-pion production in Pb–Pb ultra-peripheral collisions. This system provides an intermediate energy scale between light vector mesons and heavy quarkonia, offering new sensitivity to the transition between non-perturbative and perturbative QCD regimes.","This thesis presents new measurements of exclusive four-pion photoproduction using ALICE data from Run 2 and Run 3 at the CERN Large Hadron Collider. In addition to cross-section measurements, this work explores the polarization structure of the produced states using quantum tomography, providing a novel, model-independent approach to studying quantum correlations in high-energy collisions.","Before presenting these results, the thesis reviews the theoretical framework of QCD, the physics of ultra-peripheral collisions, and the experimental techniques employed in the ALICE detector."]},{"key":"dc:title","label":"Title","values":["Studying quantum correlations and multi-hadron states using high energy quasi-real photons"]}]}],"canonical_facts":{"dc:contributor.advisor":["Tapia Takaki, Daniel"],"dc:creator":["Gautam, Amrit"],"dc:date.accessioned":["2026-07-13T22:18:20Z"],"dc:date.available":["2026-07-13T22:18:20Z"],"dc:date.issued":["2026-05-31"],"dc:description.abstract":["Physicists use particle accelerators to probe the fundamental structure of matter by colliding particles at energies sufficient to resolve sub-nuclear degrees of freedom. The resulting final states provide insight into the underlying dynamics of nature, enabling the discovery of new particles, the validation of theoretical frameworks, and the development of advanced technologies.","A central goal of modern high-energy nuclear physics is to understand the internal structure of protons and nuclei in terms of quarks and gluons, and to determine how their interactions give rise to observable properties such as mass, spin, and confinement. Of particular interest is the behavior of gluons at high energies, where their density may become sufficiently large to induce nonlinear QCD phenomena such as gluon saturation.","In this context, photon-induced reactions in ultra-peripheral collisions (UPCs) provide a powerful and complementary probe to traditional deep inelastic scattering experiments. In UPCs, the strong electromagnetic fields of relativistic ions act as intense sources of quasi-real photons, enabling the study of photon–nucleus interactions at previously inaccessible energies and extremely small Bjorken-$x$ values.","The photoproduction of vector mesons has emerged as a particularly sensitive observable for probing nuclear gluon distributions and QCD dynamics. Recent measurements indicate that nuclear effects such as shadowing and possible saturation play a significant role, although their precise interplay remains an open question.","The central goal of this thesis is to investigate these effects through the study of photoproduced multi-pion final states, with a particular focus on four-pion production in Pb–Pb ultra-peripheral collisions. This system provides an intermediate energy scale between light vector mesons and heavy quarkonia, offering new sensitivity to the transition between non-perturbative and perturbative QCD regimes.","This thesis presents new measurements of exclusive four-pion photoproduction using ALICE data from Run 2 and Run 3 at the CERN Large Hadron Collider. In addition to cross-section measurements, this work explores the polarization structure of the produced states using quantum tomography, providing a novel, model-independent approach to studying quantum correlations in high-energy collisions.","Before presenting these results, the thesis reviews the theoretical framework of QCD, the physics of ultra-peripheral collisions, and the experimental techniques employed in the ALICE detector."],"dc:identifier.other":["https://www.proquest.com/LegacyDocView/DISSNUM/32703810"],"dc:identifier.uri":["https://hdl.handle.net/1808/39413"],"dc:language.iso":["en"],"dc:publisher":["University of Kansas"],"dc:subject":["ALICE","Nuclear physics","Quantum tomography","ultra peripheral collision"],"dc:title":["Studying quantum correlations and multi-hadron states using high energy quasi-real photons"],"dc:type":["Dissertation"],"thesis:degree_discipline":["Physics & Astronomy"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-24T02:45:19Z"}