{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22948"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22948","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"A measurement of W boson-photon and Z boson-photon cross sections in the muon channel in 1.8 TeV proton-antiproton collisions","abstract":"We have measured the production cross sections x decay branching ratios for W + $\\gamma$ and Z + $\\gamma$ in the muon channel in $\\sqrt{s}$ = 1.8 TeV p-p collisions, from 3.54 $\\pm$ 0.24 $pb\\sp{-1}$ of muon W and Z data from the CDF 1988-89 Tevatron collider run. For photons in the central region ($\\vert\\eta\\vert $ 5.0 GeV and lepton-photon angular separation $\\Delta R\\sb{\\ell\\sb\\gamma} >$ 0.7, 5 $W\\sb{\\gamma}$ candidates and 2 $Z\\sb{\\gamma}$ candidates were observed. From these events, the $\\sigma \\cdot BR(W + \\gamma)$ and $\\sigma \\cdot BR(Z + \\gamma)$ cross sections for the muon samples are measured, and compared with Standard Model predictions. We also determined the cross section ratios, $W\\sb{\\gamma}$/W, $Z\\sb{\\gamma}$/Z and $W\\sb{\\gamma}/Z\\sb{\\gamma}$, which, along with the previous CDF measurement(s) of the W/Z cross section ratio provide new insight on the Standard Model, and are sensitive to anomalous couplings of the W and Z bosons. Using the $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$ absolute cross section measurements, the absence of an excess of hard photons accompanying W and Z boson production enables us to obtain direct limites on anomalous $WW\\sb{\\gamma}$, $ZZ\\sb{\\gamma}$ and $Z\\sb{\\gamma\\gamma}$ couplings. For saturation of unitarity, these experimental limits impose constraints on possible internal (composite) structure for the W and Z bosons with compositeness scale sensitivity up to $\\Lambda\\sb{W} \\sim$ 1 TeV and $\\Lambda\\sb{Z} \\sim$ 250-500 GeV, respectively. These compositeness scale limits probe the possible internal structure of the W to ${\\sim}<$2 $\\times$ 10$\\sp{-4}$fm and internal structure of the Z to ${\\sim}<$4-7 $\\times$ 10$\\sp{-4}$ fm. Limits on the anomalous $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$ couplings also impose constraints on the higher order static and transition EM moments of the W and Z boson, respectively. The muon channel measurements were combined with those made from the electron channel to arrive at $\\mu$ + e combined $\\sigma \\cdot$ BR(W) + $\\gamma$) and $\\sigma \\cdot$ BR(Z + $\\gamma$) absolute cross sections, and limits on the anomalous couplings for combined $\\mu$ + e $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$.","abstract_html":"We have measured the production cross sections x decay branching ratios for W + <span class=\"etd-inline-math\">&gamma;</span> and Z + <span class=\"etd-inline-math\">&gamma;</span> in the muon channel in $\\sqrt{s}$ = 1.8 TeV p-p collisions, from 3.54 $\\pm$ 0.24 $pb\\sp{-1}$ of muon W and Z data from the CDF 1988-89 Tevatron collider run. For photons in the central region ($\\vert\\eta\\vert $ 5.0 GeV and lepton-photon angular separation <span class=\"etd-inline-math\">\\Delta R\\sb{\\ell\\sb&gamma;} &gt;</span> 0.7, 5 <span class=\"etd-inline-math\">W\\sb{&gamma;}</span> candidates and 2 <span class=\"etd-inline-math\">Z\\sb{&gamma;}</span> candidates were observed. From these events, the <span class=\"etd-inline-math\">&sigma; \\cdot BR(W + &gamma;)</span> and <span class=\"etd-inline-math\">&sigma; \\cdot BR(Z + &gamma;)</span> cross sections for the muon samples are measured, and compared with Standard Model predictions. We also determined the cross section ratios, <span class=\"etd-inline-math\">W\\sb{&gamma;}</span>/W, <span class=\"etd-inline-math\">Z\\sb{&gamma;}</span>/Z and <span class=\"etd-inline-math\">W\\sb{&gamma;}/Z\\sb{&gamma;}</span>, which, along with the previous CDF measurement(s) of the W/Z cross section ratio provide new insight on the Standard Model, and are sensitive to anomalous couplings of the W and Z bosons. Using the <span class=\"etd-inline-math\">W\\sb{&gamma;}</span> and <span class=\"etd-inline-math\">Z\\sb{&gamma;}</span> absolute cross section measurements, the absence of an excess of hard photons accompanying W and Z boson production enables us to obtain direct limites on anomalous <span class=\"etd-inline-math\">WW\\sb{&gamma;}</span>, <span class=\"etd-inline-math\">ZZ\\sb{&gamma;}</span> and <span class=\"etd-inline-math\">Z\\sb{&gamma;&gamma;}</span> couplings. For saturation of unitarity, these experimental limits impose constraints on possible internal (composite) structure for the W and Z bosons with compositeness scale sensitivity up to $\\Lambda\\sb{W} \\sim$ 1 TeV and $\\Lambda\\sb{Z} \\sim$ 250-500 GeV, respectively. These compositeness scale limits probe the possible internal structure of the W to ${\\sim}&lt;$2 $\\times$ 10$\\sp{-4}$fm and internal structure of the Z to ${\\sim}&lt;$4-7 $\\times$ 10$\\sp{-4}$ fm. Limits on the anomalous <span class=\"etd-inline-math\">W\\sb{&gamma;}</span> and <span class=\"etd-inline-math\">Z\\sb{&gamma;}</span> couplings also impose constraints on the higher order static and transition EM moments of the W and Z boson, respectively. The muon channel measurements were combined with those made from the electron channel to arrive at <span class=\"etd-inline-math\">&mu;</span> + e combined <span class=\"etd-inline-math\">&sigma; \\cdot</span> BR(W) + <span class=\"etd-inline-math\">&gamma;</span>) and <span class=\"etd-inline-math\">&sigma; \\cdot</span> BR(Z + <span class=\"etd-inline-math\">&gamma;</span>) absolute cross sections, and limits on the anomalous couplings for combined <span class=\"etd-inline-math\">&mu;</span> + e <span class=\"etd-inline-math\">W\\sb{&gamma;}</span> and <span class=\"etd-inline-math\">Z\\sb{&gamma;}</span>.","abstract_has_math":true,"creators":["Luchini, Christopher B."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Errede, Steven M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:56:53Z","date_published":"2011-05-07T13:56:53Z","updated_at":"2026-07-22T22:25:21Z","subjects":["Physics, Elementary Particles and High Energy"],"languages":["eng"],"rights":["Copyright 1994 Luchini, Christopher B."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9503260","(UMI)AAI9503260"],"render_values":[{"text":"AAI9503260","href":null,"code":true},{"text":"(UMI)AAI9503260","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22948","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Errede, Steven M."]},{"key":"dc:creator","label":"Author","values":["Luchini, Christopher B."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:56:53Z","10000-01-01","1994"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Elementary Particles and High Energy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1994 Luchini, Christopher B."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9503260","(UMI)AAI9503260","http://hdl.handle.net/2142/22948"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have measured the production cross sections x decay branching ratios for W + $\\gamma$ and Z + $\\gamma$ in the muon channel in $\\sqrt{s}$ = 1.8 TeV p-p collisions, from 3.54 $\\pm$ 0.24 $pb\\sp{-1}$ of muon W and Z data from the CDF 1988-89 Tevatron collider run. For photons in the central region ($\\vert\\eta\\vert $ 5.0 GeV and lepton-photon angular separation $\\Delta R\\sb{\\ell\\sb\\gamma} >$ 0.7, 5 $W\\sb{\\gamma}$ candidates and 2 $Z\\sb{\\gamma}$ candidates were observed. From these events, the $\\sigma \\cdot BR(W + \\gamma)$ and $\\sigma \\cdot BR(Z + \\gamma)$ cross sections for the muon samples are measured, and compared with Standard Model predictions. We also determined the cross section ratios, $W\\sb{\\gamma}$/W, $Z\\sb{\\gamma}$/Z and $W\\sb{\\gamma}/Z\\sb{\\gamma}$, which, along with the previous CDF measurement(s) of the W/Z cross section ratio provide new insight on the Standard Model, and are sensitive to anomalous couplings of the W and Z bosons. Using the $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$ absolute cross section measurements, the absence of an excess of hard photons accompanying W and Z boson production enables us to obtain direct limites on anomalous $WW\\sb{\\gamma}$, $ZZ\\sb{\\gamma}$ and $Z\\sb{\\gamma\\gamma}$ couplings. For saturation of unitarity, these experimental limits impose constraints on possible internal (composite) structure for the W and Z bosons with compositeness scale sensitivity up to $\\Lambda\\sb{W} \\sim$ 1 TeV and $\\Lambda\\sb{Z} \\sim$ 250-500 GeV, respectively. These compositeness scale limits probe the possible internal structure of the W to ${\\sim}<$2 $\\times$ 10$\\sp{-4}$fm and internal structure of the Z to ${\\sim}<$4-7 $\\times$ 10$\\sp{-4}$ fm. Limits on the anomalous $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$ couplings also impose constraints on the higher order static and transition EM moments of the W and Z boson, respectively. The muon channel measurements were combined with those made from the electron channel to arrive at $\\mu$ + e combined $\\sigma \\cdot$ BR(W) + $\\gamma$) and $\\sigma \\cdot$ BR(Z + $\\gamma$) absolute cross sections, and limits on the anomalous couplings for combined $\\mu$ + e $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$.","Made available in DSpace on 2011-05-07T13:56:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9503260.pdf: 4824344 bytes, checksum: e397b9d399b0b95fdf247b9ed5ab735a (MD5) Previous issue date: 1994","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:01:07Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:28:59-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["A measurement of W boson-photon and Z boson-photon cross sections in the muon channel in 1.8 TeV proton-antiproton collisions"]}]}],"canonical_facts":{"dc:contributor":["Errede, Steven M."],"dc:creator":["Luchini, Christopher B."],"dc:date":["2011-05-07T13:56:53Z","10000-01-01","1994"],"dc:description":["We have measured the production cross sections x decay branching ratios for W + $\\gamma$ and Z + $\\gamma$ in the muon channel in $\\sqrt{s}$ = 1.8 TeV p-p collisions, from 3.54 $\\pm$ 0.24 $pb\\sp{-1}$ of muon W and Z data from the CDF 1988-89 Tevatron collider run. For photons in the central region ($\\vert\\eta\\vert $ 5.0 GeV and lepton-photon angular separation $\\Delta R\\sb{\\ell\\sb\\gamma} >$ 0.7, 5 $W\\sb{\\gamma}$ candidates and 2 $Z\\sb{\\gamma}$ candidates were observed. From these events, the $\\sigma \\cdot BR(W + \\gamma)$ and $\\sigma \\cdot BR(Z + \\gamma)$ cross sections for the muon samples are measured, and compared with Standard Model predictions. We also determined the cross section ratios, $W\\sb{\\gamma}$/W, $Z\\sb{\\gamma}$/Z and $W\\sb{\\gamma}/Z\\sb{\\gamma}$, which, along with the previous CDF measurement(s) of the W/Z cross section ratio provide new insight on the Standard Model, and are sensitive to anomalous couplings of the W and Z bosons. Using the $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$ absolute cross section measurements, the absence of an excess of hard photons accompanying W and Z boson production enables us to obtain direct limites on anomalous $WW\\sb{\\gamma}$, $ZZ\\sb{\\gamma}$ and $Z\\sb{\\gamma\\gamma}$ couplings. For saturation of unitarity, these experimental limits impose constraints on possible internal (composite) structure for the W and Z bosons with compositeness scale sensitivity up to $\\Lambda\\sb{W} \\sim$ 1 TeV and $\\Lambda\\sb{Z} \\sim$ 250-500 GeV, respectively. These compositeness scale limits probe the possible internal structure of the W to ${\\sim}<$2 $\\times$ 10$\\sp{-4}$fm and internal structure of the Z to ${\\sim}<$4-7 $\\times$ 10$\\sp{-4}$ fm. Limits on the anomalous $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$ couplings also impose constraints on the higher order static and transition EM moments of the W and Z boson, respectively. The muon channel measurements were combined with those made from the electron channel to arrive at $\\mu$ + e combined $\\sigma \\cdot$ BR(W) + $\\gamma$) and $\\sigma \\cdot$ BR(Z + $\\gamma$) absolute cross sections, and limits on the anomalous couplings for combined $\\mu$ + e $W\\sb{\\gamma}$ and $Z\\sb{\\gamma}$.","Made available in DSpace on 2011-05-07T13:56:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9503260.pdf: 4824344 bytes, checksum: e397b9d399b0b95fdf247b9ed5ab735a (MD5) Previous issue date: 1994","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:01:07Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:28:59-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9503260","(UMI)AAI9503260","http://hdl.handle.net/2142/22948"],"dc:language":["eng"],"dc:rights":["Copyright 1994 Luchini, Christopher B."],"dc:subject":["Physics, Elementary Particles and High Energy"],"dc:title":["A measurement of W boson-photon and Z boson-photon cross sections in the muon channel in 1.8 TeV proton-antiproton collisions"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:21Z"}