Evidence for an excess of B -> D(*) Tau Nu decays
Abstract/Contents
- Abstract
- Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B -> D(*) l Nu), where l is either an electron or a muon. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D) = 0.440 +- 0.058 +- 0.042 and R(D*) = 0.332 +- 0.024 +- 0.018, which exceed the Standard Model expectations by 2.0 sigma and 2.7 sigma, respectively. Taken together, our results disagree with these expectations at the 3.4 sigma level, which could be an indication of beyond-the-Standard- Model processes affecting these decays. We examine whether the excess in R(D) and R(D*) could be explained by a charged Higgs boson in the type II two-Higgs-doublet model, which describes the Higgs sector of the Minimal Supersymmetric model at tree level. We exclude this possibility in the full parameter space with a probability of at least 99.8%, or 3.1sigma significance. We also report the observation of the decay B -> D Tau Nu, with a significance of 6.8 sigma.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2012 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Franco Sevilla, Manuel |
|---|---|
| Associated with | Stanford University, Department of Applied Physics |
| Primary advisor | Byer, R. L. (Robert L.), 1942- |
| Primary advisor | Lüth, Vera |
| Thesis advisor | Byer, R. L. (Robert L.), 1942- |
| Thesis advisor | Lüth, Vera |
| Thesis advisor | Burchat, P. (Patricia) |
| Thesis advisor | Peskin, Michael Edward, 1951- |
| Advisor | Burchat, P. (Patricia) |
| Advisor | Peskin, Michael Edward, 1951- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Manuel Franco Sevilla. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2012. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2012 by Manuel Franco Sevilla
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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