{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:45"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:45","repository":{"repo_id":"freiburg-diss","name":"University of Freiburg","base_url":"https://freidok.uni-freiburg.de/oai/oai2.php"},"display":{"title":"Analysis of Excited B Mesons with the OPAL Detector at LEP","abstract":"A comprehensive high-statistics analysis of the low lying non-strange excited B meson states is performed. From 4 million hadronic
Z^0 decays recorded by the OPAL detector on and near to the Z^0 resonance, a sample of more than 570,000 inclusively reconstructed
B mesons is selected making use of improved tagging and reconstruction methods. B* mesons are reconstructed using the decay
B* -> B gamma. About 9,000 reconstructed B* candidates using photon conversions and more than 64,000 B* candidates using
photons detected in the electromagnetic calorimeter constitute the largest sample of B* mesons to date. More than 20,000
orbitally-excited mesons B*_J are reconstructed using B pi combinations. A new method is used to determine the B pi
combinatorial background and its systematic uncertainty. The selected B* candidates are used to obtain samples enriched or depleted in
the decay B*_J -> B* pi (pi), where the (pi) notation refers to decay modes with or without a second accompanying pion. From the number of
signal candidates in the B pi mass spectra of the two samples, the first measurement of the branching ratio of orbitally-excited B mesons
decaying into B* pi (pi) is performed. In the framework of Heavy Quark Symmetry, a fit to the total B pi mass spectrum and a simultaneous fit to the B pi mass spectra of the
samples enriched or depleted in the decay B*_J -> B* pi (pi) yield the
mass and the width of the B_1(3/2) state, as well as the branching ratio
of orbitally-excited B mesons decaying into B* pi.
In a separate analysis, a search for the first radial excitation of B and
B* has been performed. An excess observed in the B pi+ pi- mass spectrum
is interpreted as a combined signal of B(*)' -> B(*) pi+ pi- and
B*_J -> B(*) pi+ pi- decays.","abstract_html":"A comprehensive high-statistics analysis of the low lying non-strange excited B meson states is performed. From 4 million hadronic <br>Z^0 decays recorded by the OPAL detector on and near to the Z^0 resonance, a sample of more than 570,000 inclusively reconstructed <br>B mesons is selected making use of improved tagging and reconstruction methods. B* mesons are reconstructed using the decay <br>B* -> B gamma. About 9,000 reconstructed B* candidates using photon conversions and more than 64,000 B* candidates using <br>photons detected in the electromagnetic calorimeter constitute the largest sample of B* mesons to date. More than 20,000 <br>orbitally-excited mesons B*_J are reconstructed using B pi combinations. A new method is used to determine the B pi <br>combinatorial background and its systematic uncertainty. The selected B* candidates are used to obtain samples enriched or depleted in <br>the decay B*_J -> B* pi (pi), where the (pi) notation refers to decay modes with or without a second accompanying pion. From the number of <br>signal candidates in the B pi mass spectra of the two samples, the first measurement of the branching ratio of orbitally-excited B mesons <br>decaying into B* pi (pi) is performed. In the framework of Heavy Quark Symmetry, a fit to the total B pi mass spectrum and a simultaneous fit to the B pi mass spectra of the <br>samples enriched or depleted in the decay B*_J -> B* pi (pi) yield the <br>mass and the width of the B_1(3/2) state, as well as the branching ratio <br>of orbitally-excited B mesons decaying into B* pi. <br>In a separate analysis, a search for the first radial excitation of B and <br>B* has been performed. An excess observed in the B pi+ pi- mass spectrum <br>is interpreted as a combined signal of B(*)' -> B(*) pi+ pi- and <br>B*_J -> B(*) pi+ pi- decays.","abstract_has_math":false,"creators":["Thiergen, Michael"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Herten, Gregor"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T02:21:24Z","subjects":["B-Stern-Meson","B-Stern-J-Meson","HQET","HQS"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/45","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Herten, Gregor"]},{"key":"dc:creator","label":"Author","values":["Thiergen, Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["DoctoralThesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["B-Stern-Meson","B-Stern-J-Meson","HQET","HQS"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A comprehensive high-statistics analysis of the low lying non-strange excited B meson states is performed. From 4 million hadronic
Z^0 decays recorded by the OPAL detector on and near to the Z^0 resonance, a sample of more than 570,000 inclusively reconstructed
B mesons is selected making use of improved tagging and reconstruction methods. B* mesons are reconstructed using the decay
B* -> B gamma. About 9,000 reconstructed B* candidates using photon conversions and more than 64,000 B* candidates using
photons detected in the electromagnetic calorimeter constitute the largest sample of B* mesons to date. More than 20,000
orbitally-excited mesons B*_J are reconstructed using B pi combinations. A new method is used to determine the B pi
combinatorial background and its systematic uncertainty. The selected B* candidates are used to obtain samples enriched or depleted in
the decay B*_J -> B* pi (pi), where the (pi) notation refers to decay modes with or without a second accompanying pion. From the number of
signal candidates in the B pi mass spectra of the two samples, the first measurement of the branching ratio of orbitally-excited B mesons
decaying into B* pi (pi) is performed. In the framework of Heavy Quark Symmetry, a fit to the total B pi mass spectrum and a simultaneous fit to the B pi mass spectra of the
samples enriched or depleted in the decay B*_J -> B* pi (pi) yield the
mass and the width of the B_1(3/2) state, as well as the branching ratio
of orbitally-excited B mesons decaying into B* pi.
In a separate analysis, a search for the first radial excitation of B and
B* has been performed. An excess observed in the B pi+ pi- mass spectrum
is interpreted as a combined signal of B(*)' -> B(*) pi+ pi- and
B*_J -> B(*) pi+ pi- decays."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Analysis of Excited B Mesons with the OPAL Detector at LEP"]}]}],"canonical_facts":{"dc:contributor":["Herten, Gregor"],"dc:creator":["Thiergen, Michael"],"dc:description.abstract":["A comprehensive high-statistics analysis of the low lying non-strange excited B meson states is performed. From 4 million hadronic
Z^0 decays recorded by the OPAL detector on and near to the Z^0 resonance, a sample of more than 570,000 inclusively reconstructed
B mesons is selected making use of improved tagging and reconstruction methods. B* mesons are reconstructed using the decay
B* -> B gamma. About 9,000 reconstructed B* candidates using photon conversions and more than 64,000 B* candidates using
photons detected in the electromagnetic calorimeter constitute the largest sample of B* mesons to date. More than 20,000
orbitally-excited mesons B*_J are reconstructed using B pi combinations. A new method is used to determine the B pi
combinatorial background and its systematic uncertainty. The selected B* candidates are used to obtain samples enriched or depleted in
the decay B*_J -> B* pi (pi), where the (pi) notation refers to decay modes with or without a second accompanying pion. From the number of
signal candidates in the B pi mass spectra of the two samples, the first measurement of the branching ratio of orbitally-excited B mesons
decaying into B* pi (pi) is performed. In the framework of Heavy Quark Symmetry, a fit to the total B pi mass spectrum and a simultaneous fit to the B pi mass spectra of the
samples enriched or depleted in the decay B*_J -> B* pi (pi) yield the
mass and the width of the B_1(3/2) state, as well as the branching ratio
of orbitally-excited B mesons decaying into B* pi.
In a separate analysis, a search for the first radial excitation of B and
B* has been performed. An excess observed in the B pi+ pi- mass spectrum
is interpreted as a combined signal of B(*)' -> B(*) pi+ pi- and
B*_J -> B(*) pi+ pi- decays."],"dc:format.medium":["application/pdf"],"dc:subject":["B-Stern-Meson","B-Stern-J-Meson","HQET","HQS"],"dc:title":["Analysis of Excited B Mesons with the OPAL Detector at LEP"],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:21:24Z"}