{"id":{"repo_id":"lmu-germany","oai_identifier":"oai:edoc.ub.uni-muenchen.de:841"},"canonical_url":"https://search.dev.ndltd.org/etd/lmu-germany/oai:edoc.ub.uni-muenchen.de:841","repository":{"repo_id":"lmu-germany","name":"Ludwig Maxmilians Universität München","base_url":"https://edoc.ub.uni-muenchen.de/cgi/oai2"},"display":{"title":"A measurement of the relative decay rate of the charm quark into leptons","abstract":"The inclusive rate of leptons produced from charmed particle decays (from Z -> charm anticharm) has been measured using a data sample of four million hgadronic Z decays recorded by the ALEPH experiment at LEP from 1991 to 1995. The analysis uses a double-tag and is self-calibrating, i.e. it makes minimum use of the Monte Carlo simulated information. Each event is divided into two hemispheres; hemispheres containing charm quarks are identified with a NEural Network anlaysis method. Lepton candidates are then searched for in the opposite hemisphere. Based on fully reconstructed D candidates, a value of BR(c -> l + X) = 9.09 +/- 0.61 % (l = e or mu) is obtained. The uncertainy includes both the statistical and systematic components.","abstract_html":"The inclusive rate of leptons produced from charmed particle decays (from Z -> charm anticharm) has been measured using a data sample of four million hgadronic Z decays recorded by the ALEPH experiment at LEP from 1991 to 1995. The analysis uses a double-tag and is self-calibrating, i.e. it makes minimum use of the Monte Carlo simulated information. Each event is divided into two hemispheres; hemispheres containing charm quarks are identified with a NEural Network anlaysis method. Lepton candidates are then searched for in the opposite hemisphere. Based on fully reconstructed D candidates, a value of BR(c -> l + X) = 9.09 +/- 0.61 % (l = e or mu) is obtained. The uncertainy includes both the statistical and systematic components.","abstract_has_math":false,"creators":["David, Aretina Magdalena"],"institution":"Ludwig-Maximilians-Universität","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2003,"date_issued":"2003-02-10","date_published":"2003-02-10","updated_at":"2026-07-24T02:51:36Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://edoc.ub.uni-muenchen.de/841/","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["David, Aretina Magdalena"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek der Ludwig-Maximilians-Universität"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Ludwig-Maximilians-Universität"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The inclusive rate of leptons produced from charmed particle decays (from Z -> charm anticharm) has been measured using a data sample of four million hgadronic Z decays recorded by the ALEPH experiment at LEP from 1991 to 1995. The analysis uses a double-tag and is self-calibrating, i.e. it makes minimum use of the Monte Carlo simulated information. Each event is divided into two hemispheres; hemispheres containing charm quarks are identified with a NEural Network anlaysis method. Lepton candidates are then searched for in the opposite hemisphere. Based on fully reconstructed D candidates, a value of BR(c -> l + X) = 9.09 +/- 0.61 % (l = e or mu) is obtained. The uncertainy includes both the statistical and systematic components.","Ziel dieser Arbeit ist es das leptonische Verzweigungsverhaeltnis von Charm Quarks zu vermessen. Dafuer wurden vier Millionen hadronische Z-Zerfaelle benutzt, die am LEP Experiment ALEPH zwischen 1991 und 1995 aufgezeichnet wurden. Diese Analyse ist selbstkalibriend und beruht auf minimalem Gebrauch von Monte-Carlo Simulationen. Jede Ereignis wurde in zwei Hamispheren aufgeteilt; wurde in der einen Hemisphere ein Charm Quark unter Beihilfe Neuronaler Netze identifiziert, so wurde in der anderen Hemisphere nach einem dazugehoerigen Lepton gesucht. Aufgrund eines Datensatzes vollstaendig rekonstruierter D-Kandidaten war es moeglich, ein Verzweigungsverhaeltnis BR(c -> l + X) = 9.09 +/- 0.61 % (l = e oder mu) zu erhalten. Der angegebene Fehler beinhaltet statistische und systematische Unsicherheiten."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["A measurement of the relative decay rate of the charm quark into leptons"]}]}],"canonical_facts":{"dc:creator":["David, Aretina Magdalena"],"dc:description.abstract":["The inclusive rate of leptons produced from charmed particle decays (from Z -> charm anticharm) has been measured using a data sample of four million hgadronic Z decays recorded by the ALEPH experiment at LEP from 1991 to 1995. The analysis uses a double-tag and is self-calibrating, i.e. it makes minimum use of the Monte Carlo simulated information. Each event is divided into two hemispheres; hemispheres containing charm quarks are identified with a NEural Network anlaysis method. Lepton candidates are then searched for in the opposite hemisphere. Based on fully reconstructed D candidates, a value of BR(c -> l + X) = 9.09 +/- 0.61 % (l = e or mu) is obtained. The uncertainy includes both the statistical and systematic components.","Ziel dieser Arbeit ist es das leptonische Verzweigungsverhaeltnis von Charm Quarks zu vermessen. Dafuer wurden vier Millionen hadronische Z-Zerfaelle benutzt, die am LEP Experiment ALEPH zwischen 1991 und 1995 aufgezeichnet wurden. Diese Analyse ist selbstkalibriend und beruht auf minimalem Gebrauch von Monte-Carlo Simulationen. Jede Ereignis wurde in zwei Hamispheren aufgeteilt; wurde in der einen Hemisphere ein Charm Quark unter Beihilfe Neuronaler Netze identifiziert, so wurde in der anderen Hemisphere nach einem dazugehoerigen Lepton gesucht. Aufgrund eines Datensatzes vollstaendig rekonstruierter D-Kandidaten war es moeglich, ein Verzweigungsverhaeltnis BR(c -> l + X) = 9.09 +/- 0.61 % (l = e oder mu) zu erhalten. Der angegebene Fehler beinhaltet statistische und systematische Unsicherheiten."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek der Ludwig-Maximilians-Universität"],"dc:title":["A measurement of the relative decay rate of the charm quark into leptons"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Ludwig-Maximilians-Universität"]},"updated_at":"2026-07-24T02:51:36Z"}