Non-leptonic B-decays in and beyond QCD Factorisation
| dc.creator | Talbot, Angelique N. | |
| dc.date | 2005-11-02 | |
| dc.date.accessioned | 2026-07-07T06:49:52Z | |
| dc.date.available | 2026-07-07T06:49:52Z | |
| dc.description | This thesis examines the non-leptonic B-decays within QCD factorisation and beyond, to challenge the assumptions and limitations of the method. We analyse the treatment of the distribution amplitudes of light mesons and present a new model described by simple physical parameters. The leading twist distribution amplitudes of light mesons describe the leading non-perturbative hadronic contributions to exclusive QCD reactions at large energy transfer, for instance electromagnetic form factors. Importantly, they also enter into the two-body B decay amplitudes described by QCD factorisation. They cannot be calculated from first principles and are described by models based on a fixed-order conformal expansion, which is not always sufficient in phenomenological applications. We derive new models that are valid to all orders in the conformal expansion and characterised by a small number of parameters related to experimental observables.Motivated by the marginal agreement between the QCD factorisation results with the experimental data, in particular for $B\toππ$, we scrutinise the incalculable non-factorisable corrections to charmless non-leptonic decays. We use the available results on $B\toππ$ to extract information about the size and nature of the required non-factorisable corrections that are needed to reconcile the predictions and data. We find that the best-fit scenarios do not give reasonable agreement to $2σ$ until at least a 40% non-factorisable contribution is added. Finally we consider the exclusive $B\to Vγ$ decays, where we analyse the recently updated experimental data within QCD factorisation and present constraints on generic supersymmetric models using the mass insertion approximation. | |
| dc.description | 132 pages, PHD thesis; full text with high-resolution figures available from http://www.ippp.dur.ac.uk/Research/Theses/talbot.ps.gz | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0511022 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0511022 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/104511 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Non-leptonic B-decays in and beyond QCD Factorisation | |
| dc.type | text |