Search for Lepton Universality Violation Using Υ (3S) Decays
| dc.contributor.author | King, Gregory | |
| dc.contributor.supervisor | Roney, J. Michael | |
| dc.date.accessioned | 2014-12-23T21:16:28Z | |
| dc.date.available | 2014-12-23T21:16:28Z | |
| dc.date.copyright | 2014 | en_US |
| dc.date.issued | 2014-12-23 | |
| dc.degree.department | Department of Physics and Astronomy | en_US |
| dc.degree.level | Doctor of Philosophy Ph.D. | en_US |
| dc.description.abstract | The measurement of the ratio of the branching fractions of Υ (3S) decays into τ leptons over dimuons (R τ /μ = B(Υ (3S) → τ + τ − )/B(Υ (3S) → μ + μ − )) is a test of lepton universality. A violation of lepton universality would be evidence of new physics (and possibly of a light CP-odd Higgs boson). A sample of Υ (3S) decays (2.408 fb −1 ) collected with the B A B AR detector at the SLAC National Accelerator Laboratory was used to determine that the ratio R τ /μ is R τ /μ = 1.0385 ± 0.034 ± 0.019. Using the remaining blinded data sample (corresponding to an integrated luminosity of 25.6 fb −1 ) the estimated statistical sensitivity will be 1.1 % and the estimated systematic uncertainty of R τ /μ is 1.9 %. Prior to this work, previous measurements of R τ /μ had an estimated total precision of 10 %. | en_US |
| dc.description.scholarlevel | Graduate | en_US |
| dc.identifier.uri | http://hdl.handle.net/1828/5809 | |
| dc.language | English | eng |
| dc.language.iso | en | en_US |
| dc.rights.temp | Available to the World Wide Web | en_US |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ | * |
| dc.subject | lepton universality | en_US |
| dc.subject | high energy physics | en_US |
| dc.subject | BaBar Collaboration | en_US |
| dc.subject | tau lepton | en_US |
| dc.subject | muon | en_US |
| dc.subject | cross section | en_US |
| dc.title | Search for Lepton Universality Violation Using Υ (3S) Decays | en_US |
| dc.type | Thesis | en_US |