A search for the rare decay of a [B meson to two photons]

dc.contributor.advisorRitchie, Jack L., 1955-en
dc.contributor.committeeMemberLang, Karolen
dc.contributor.committeeMemberSchwitters, Royen
dc.contributor.committeeMemberHoffmann, Geralden
dc.contributor.committeeMemberLambert, Daviden
dc.creatorRuland, Andrew Michaelen
dc.date.accessioned2010-10-01T16:15:17Zen
dc.date.accessioned2010-10-01T16:15:27Zen
dc.date.accessioned2017-05-11T22:20:18Z
dc.date.available2010-10-01T16:15:17Zen
dc.date.available2010-10-01T16:15:27Zen
dc.date.available2017-05-11T22:20:18Z
dc.date.issued2010-05en
dc.date.submittedMay 2010en
dc.date.updated2010-10-01T16:15:27Zen
dc.descriptiontexten
dc.description.abstractThis thesis describes a search for the rare radiative decay of a B meson to two photons. where the charged congugate mode is implied throughout. These decays are highly suppressed in the Standard Model where the branching fraction is expected to be of order 10^-8. In some new physics scenarios this could be enhanced by up to an order of magnitude to 10^-7. Therefore an observation of a significant signal above the Standard Model prediction could be a sign of new physics. The search for this rare decay was performed using the data collected with the BaBar detector at the SLAC National Accelerator Laboratory PEP-II storage ring operating at the Upsilon(4S) resonance. The analysis uses a dataset with an integrated luminosity of 425.7 fb-1 corresponding to 467 million BB pairs. A signal yield of 21.3 +12.8 -11.8 events with a significance of 1.88 sigma was measured using an unbinned extended maximum likelihood fit. An upper limit on the branching fraction is set at the 90% confidence level of less than 3.2 times 10^-7. This is about two times more stringent than the best upper limit of less than 6.2 times 10^-7 published by the Belle collaboration.en
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2010-05-924en
dc.language.isoengen
dc.subjectB mesonen
dc.subjectRare decayen
dc.subjectPhotonsen
dc.subjectStandard modelen
dc.titleA search for the rare decay of a [B meson to two photons]en
dc.type.genrethesisen

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