{"id":{"repo_id":"cambridge","oai_identifier":"oai:www.repository.cam.ac.uk:1810/271838"},"canonical_url":"https://search.dev.ndltd.org/etd/cambridge/oai:www.repository.cam.ac.uk:1810/271838","repository":{"repo_id":"cambridge","name":"Cambridge University","base_url":"https://api.repository.cam.ac.uk/server/oai/request"},"display":{"title":"The ZZ → 4l process and anomalous triple gauge couplings with ATLAS at the LHC","abstract":"This thesis is a presentation of an analysis of the $ZZ\\rightarrow 4\\ell$ ($\\ell = e,\\mu$) process in proton-proton collisions with centre-of-mass energy $\\sqrt{s}$ = 13 TeV at the LHC during 2015 and 2016 (a total integrated luminosity of 36.1 fb$^{-1}$), using the ATLAS detector. Candidate $ZZ \\rightarrow 4\\ell$ events are selected in the three decay channels, $4e$, $2e2\\mu$ and $4\\mu$. The cross section of the $ZZ\\rightarrow 4\\ell$ process is measured in four fiducial regions closely matching the detector acceptance: one for each decay channel ($4e$, $2e2\\mu$ and $4\\mu$) and one for the combination of all decay channels. The total cross section of $pp\\rightarrow ZZ$ is measured in a phase-space in which both $Z$ bosons have a mass $m_{Z}$ in the range 66 GeV $ < m_{Z} < $ 116 GeV to be 16.5 $\\pm 0.5$ (stat.) $\\pm 0.4$ (syst.) $\\pm 0.5$ (lumi.)$\\,$ pb which is consistent with a next-to-next-to-leading-order prediction of $16.9^{+0.6}_{-0.5}$ pb. Observed event yields in four bins of transverse momentum are used to set 95{\\%} CL$_{\\text{s}}$ limits on four neutral triple gauge couplings ($f^{V}_{i}$, $V=Z,\\gamma$, $i=4,5$) which parameterise an effective $ZZV$ vertex (assuming both $Z$ bosons are on shell). The obtained limits are of the order of $|f^{V}_{i}|<0.0017$.","abstract_html":"This thesis is a presentation of an analysis of the $ZZ\\rightarrow 4\\ell$ (<span class=\"etd-inline-math\">\\ell = e,&mu;</span>) process in proton-proton collisions with centre-of-mass energy $\\sqrt{s}$ = 13 TeV at the LHC during 2015 and 2016 (a total integrated luminosity of 36.1 fb<span class=\"etd-inline-math\"><sup>-1</sup></span>), using the ATLAS detector. Candidate $ZZ \\rightarrow 4\\ell$ events are selected in the three decay channels, $4e$, <span class=\"etd-inline-math\">2e2&mu;</span> and <span class=\"etd-inline-math\">4&mu;</span>. The cross section of the $ZZ\\rightarrow 4\\ell$ process is measured in four fiducial regions closely matching the detector acceptance: one for each decay channel ($4e$, <span class=\"etd-inline-math\">2e2&mu;</span> and <span class=\"etd-inline-math\">4&mu;</span>) and one for the combination of all decay channels. The total cross section of $pp\\rightarrow ZZ$ is measured in a phase-space in which both $Z$ bosons have a mass <span class=\"etd-inline-math\">m<sub>Z</sub></span> in the range 66 GeV <span class=\"etd-inline-math\"> &lt; m<sub>Z</sub> &lt; </span> 116 GeV to be 16.5 $\\pm 0.5$ (stat.) $\\pm 0.4$ (syst.) $\\pm 0.5$ (lumi.)<span class=\"etd-inline-math\"> </span> pb which is consistent with a next-to-next-to-leading-order prediction of <span class=\"etd-inline-math\">16.9<sup>+0.6</sup><sub>-0.5</sub></span> pb. Observed event yields in four bins of transverse momentum are used to set 95{\\%} CL<span class=\"etd-inline-math\"><sub>\\text{s}</sub></span> limits on four neutral triple gauge couplings (<span class=\"etd-inline-math\">f<sup>V</sup><sub>i</sub></span>, <span class=\"etd-inline-math\">V=Z,&gamma;</span>, $i=4,5$) which parameterise an effective $ZZV$ vertex (assuming both $Z$ bosons are on shell). The obtained limits are of the order of <span class=\"etd-inline-math\">|f<sup>V</sup><sub>i</sub>|&lt;0.0017</span>.","abstract_has_math":true,"creators":["Rosten, Jonatan Hans Niclas"],"institution":"University of Cambridge","degree_name":"Doctor of Philosophy (PhD)","degree_level":"Doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Batley, John Richard"],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-04-28","date_published":"2018-04-28","updated_at":"2026-07-22T22:24:25Z","subjects":["High Energy Phyics","Particle Physics","Physics"],"languages":["en"],"rights":[],"rights_urls":["https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/0636453b-34ca-4d8a-ab6c-11ffc5028a5a/download","https://www.rioxx.net/licenses/all-rights-reserved/"],"identifier_entries":[]},"links":{"outbound_url":"https://doi.org/10.17863/CAM.18842","outbound_label":"DOI","outbound_source":"dc:identifier.doi"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Batley, John Richard"]},{"key":"dc:contributor.sponsor","label":"Sponsor","values":["STFC"]},{"key":"dc:creator","label":"Author","values":["Rosten, Jonatan Hans Niclas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2018-04-28"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cambridge"]},{"key":"dc:relation.isreferencedby.uri","label":"Dc Relation Isreferencedby URI","values":["https://www.repository.cam.ac.uk/handle/1810/271838"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Doctor of Philosophy (PhD)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["High Energy Phyics","Particle Physics","Physics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/0636453b-34ca-4d8a-ab6c-11ffc5028a5a/download","https://www.rioxx.net/licenses/all-rights-reserved/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["10.17863/CAM.18842"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/4cab7e8f-c6be-4bd0-8eaf-0082a81a0a1e/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This thesis is a presentation of an analysis of the $ZZ\\rightarrow 4\\ell$ ($\\ell = e,\\mu$) process in proton-proton collisions with centre-of-mass energy $\\sqrt{s}$ = 13 TeV at the LHC during 2015 and 2016 (a total integrated luminosity of 36.1 fb$^{-1}$), using the ATLAS detector. Candidate $ZZ \\rightarrow 4\\ell$ events are selected in the three decay channels, $4e$, $2e2\\mu$ and $4\\mu$. The cross section of the $ZZ\\rightarrow 4\\ell$ process is measured in four fiducial regions closely matching the detector acceptance: one for each decay channel ($4e$, $2e2\\mu$ and $4\\mu$) and one for the combination of all decay channels. The total cross section of $pp\\rightarrow ZZ$ is measured in a phase-space in which both $Z$ bosons have a mass $m_{Z}$ in the range 66 GeV $ < m_{Z} < $ 116 GeV to be 16.5 $\\pm 0.5$ (stat.) $\\pm 0.4$ (syst.) $\\pm 0.5$ (lumi.)$\\,$ pb which is consistent with a next-to-next-to-leading-order prediction of $16.9^{+0.6}_{-0.5}$ pb. Observed event yields in four bins of transverse momentum are used to set 95{\\%} CL$_{\\text{s}}$ limits on four neutral triple gauge couplings ($f^{V}_{i}$, $V=Z,\\gamma$, $i=4,5$) which parameterise an effective $ZZV$ vertex (assuming both $Z$ bosons are on shell). The obtained limits are of the order of $|f^{V}_{i}|<0.0017$."]},{"key":"dc:format.checksum.md5","label":"Dc Format Checksum Md5","values":["87eda9de84448d1f82354d60eee3eb5f","cc3fbd810bc4c8d7ebc9a7516ad6a5cc"]},{"key":"dc:title","label":"Title","values":["The ZZ → 4l process and anomalous triple gauge couplings with ATLAS at the LHC"]}]}],"canonical_facts":{"dc:contributor.advisor":["Batley, John Richard"],"dc:contributor.sponsor":["STFC"],"dc:creator":["Rosten, Jonatan Hans Niclas"],"dc:date.issued":["2018-04-28"],"dc:description.abstract":["This thesis is a presentation of an analysis of the $ZZ\\rightarrow 4\\ell$ ($\\ell = e,\\mu$) process in proton-proton collisions with centre-of-mass energy $\\sqrt{s}$ = 13 TeV at the LHC during 2015 and 2016 (a total integrated luminosity of 36.1 fb$^{-1}$), using the ATLAS detector. Candidate $ZZ \\rightarrow 4\\ell$ events are selected in the three decay channels, $4e$, $2e2\\mu$ and $4\\mu$. The cross section of the $ZZ\\rightarrow 4\\ell$ process is measured in four fiducial regions closely matching the detector acceptance: one for each decay channel ($4e$, $2e2\\mu$ and $4\\mu$) and one for the combination of all decay channels. The total cross section of $pp\\rightarrow ZZ$ is measured in a phase-space in which both $Z$ bosons have a mass $m_{Z}$ in the range 66 GeV $ < m_{Z} < $ 116 GeV to be 16.5 $\\pm 0.5$ (stat.) $\\pm 0.4$ (syst.) $\\pm 0.5$ (lumi.)$\\,$ pb which is consistent with a next-to-next-to-leading-order prediction of $16.9^{+0.6}_{-0.5}$ pb. Observed event yields in four bins of transverse momentum are used to set 95{\\%} CL$_{\\text{s}}$ limits on four neutral triple gauge couplings ($f^{V}_{i}$, $V=Z,\\gamma$, $i=4,5$) which parameterise an effective $ZZV$ vertex (assuming both $Z$ bosons are on shell). The obtained limits are of the order of $|f^{V}_{i}|<0.0017$."],"dc:format.checksum.md5":["87eda9de84448d1f82354d60eee3eb5f","cc3fbd810bc4c8d7ebc9a7516ad6a5cc"],"dc:identifier.doi":["10.17863/CAM.18842"],"dc:identifier.uri":["https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/4cab7e8f-c6be-4bd0-8eaf-0082a81a0a1e/download"],"dc:language":["en"],"dc:publisher.institution":["University of Cambridge"],"dc:relation.isreferencedby.uri":["https://www.repository.cam.ac.uk/handle/1810/271838"],"dc:rights":["https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/0636453b-34ca-4d8a-ab6c-11ffc5028a5a/download","https://www.rioxx.net/licenses/all-rights-reserved/"],"dc:subject":["High Energy Phyics","Particle Physics","Physics"],"dc:title":["The ZZ → 4l process and anomalous triple gauge couplings with ATLAS at the LHC"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["Doctoral"],"dc:type.qualificationname":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-22T22:24:25Z"}