{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/46386"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/46386","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Measurement of CP asymmetry in [beta] --> [sigma] [gamma] decays using a sum of exclusive final states","abstract":"In this thesis, I describe a study of the CP asymmetry in [beta] --> [sigma] [gamma] decays. This CP asymmetry is expected to be less than 0.01 in the Standard Model, but could be enhanced up to the order of 0.10 by non-Standard Model contributions. We use a sample of 383 x 106 BB events collected by the BABAR detector at the PEP-II asymmetric B factory and reconstruct sixteen flavor-specific B decay modes containing a high energy photon and a hadronic Xs system. We measure the CP asymmetry to be -0.011 ± 0.030stat ± 0.014syst for a photon energy threshold at 1.6 GeV and the hadronic system mass between 0.6 and 2.8 GeV/c2.","abstract_html":"In this thesis, I describe a study of the CP asymmetry in [beta] --> [sigma] [gamma] decays. This CP asymmetry is expected to be less than 0.01 in the Standard Model, but could be enhanced up to the order of 0.10 by non-Standard Model contributions. We use a sample of 383 x 106 BB events collected by the BABAR detector at the PEP-II asymmetric B factory and reconstruct sixteen flavor-specific B decay modes containing a high energy photon and a hadronic Xs system. We measure the CP asymmetry to be -0.011 ± 0.030stat ± 0.014syst for a photon energy threshold at 1.6 GeV and the hadronic system mass between 0.6 and 2.8 GeV/c2.","abstract_has_math":false,"creators":["Zhao, Minliang"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Dept. of Physics.","school":null,"contributors":[],"advisors":["Gabriella Sciolla."],"committee_chairs":[],"committee_members":[],"year":2008,"date_issued":"2008","date_published":"2008","updated_at":"2026-07-22T22:20:58Z","subjects":["Physics."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/46386","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Gabriella Sciolla."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Dept. of Physics."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. Dept. of Physics."]},{"key":"dc:creator","label":"Author","values":["Zhao, Minliang"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2009-08-25T18:01:23Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2009-08-25T18:01:23Z"]},{"key":"dc:date.issued","label":"Date","values":["2008"]},{"key":"dc:publisher","label":"Institution","values":["Massachusetts Institute of Technology"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/46386"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.","This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.","In title on title page,\"[ beta]\", \"[sigma]\" and \"[gamma]\" appear as lower case Greek letters and \"-->\" appears as a right arrow.","Includes bibliographical references (leaves 133-136)."]},{"key":"dc:description.abstract","label":"Abstract","values":["In this thesis, I describe a study of the CP asymmetry in [beta] --> [sigma] [gamma] decays. This CP asymmetry is expected to be less than 0.01 in the Standard Model, but could be enhanced up to the order of 0.10 by non-Standard Model contributions. We use a sample of 383 x 106 BB events collected by the BABAR detector at the PEP-II asymmetric B factory and reconstruct sixteen flavor-specific B decay modes containing a high energy photon and a hadronic Xs system. We measure the CP asymmetry to be -0.011 ± 0.030stat ± 0.014syst for a photon energy threshold at 1.6 GeV and the hadronic system mass between 0.6 and 2.8 GeV/c2."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:title","label":"Title","values":["Measurement of CP asymmetry in [beta] --> [sigma] [gamma] decays using a sum of exclusive final states"]}]}],"canonical_facts":{"dc:contributor.advisor":["Gabriella Sciolla."],"dc:contributor.department":["Massachusetts Institute of Technology. Dept. of Physics."],"dc:contributor.other":["Massachusetts Institute of Technology. Dept. of Physics."],"dc:creator":["Zhao, Minliang"],"dc:date.accessioned":["2009-08-25T18:01:23Z"],"dc:date.available":["2009-08-25T18:01:23Z"],"dc:date.issued":["2008"],"dc:description":["Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.","This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.","In title on title page,\"[ beta]\", \"[sigma]\" and \"[gamma]\" appear as lower case Greek letters and \"-->\" appears as a right arrow.","Includes bibliographical references (leaves 133-136)."],"dc:description.abstract":["In this thesis, I describe a study of the CP asymmetry in [beta] --> [sigma] [gamma] decays. This CP asymmetry is expected to be less than 0.01 in the Standard Model, but could be enhanced up to the order of 0.10 by non-Standard Model contributions. We use a sample of 383 x 106 BB events collected by the BABAR detector at the PEP-II asymmetric B factory and reconstruct sixteen flavor-specific B decay modes containing a high energy photon and a hadronic Xs system. We measure the CP asymmetry to be -0.011 ± 0.030stat ± 0.014syst for a photon energy threshold at 1.6 GeV and the hadronic system mass between 0.6 and 2.8 GeV/c2."],"dc:description.degree":["Ph.D."],"dc:identifier.uri":["http://hdl.handle.net/1721.1/46386"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Physics."],"dc:title":["Measurement of CP asymmetry in [beta] --> [sigma] [gamma] decays using a sum of exclusive final states"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:20:58Z"}