Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.741734
Title: B physics from lattice QCD : a study of Bₛ → Kℓν, Bₛ → Dₛℓν and Bₛ → øℓ⁺ℓ⁻ form factors
Author: Lizarazo, Edwin
ISNI:       0000 0004 7225 6240
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2018
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Abstract:
The Standard Model of particle physics currently stands as our most complete theory of fundamental particles and interactions. It is a well tested physics theory but tensions have been found between theoretical predictions and experimental results. These discrepancies can be either a sign of New Physics or the result of insufficient control over theoretical and experimental uncertainties. In order to detect/rule-out new physics effects in the flavour sector it is important to improve our understanding of flavour changing processes which occur at tree and loop level in the Standard Model. Semileptonic B decays provide promising channels to test the Standard Model and search for signs of New Physics. While the B-factories and LHCb carry out measurements of B-meson observables, theoretical determinations of form factors are necessary for the extraction of Cabibbo-Kobayashi-Maskawa matrix elements, the determination of differential branching fractions and angular distributions amongst other quantities. In this work we present the calculation of Bs → Klv, Bs → Dslv and Bs → øl+l- form factors using the Columbia interpretation of the relativistic heavy quark action for the b-quark and the domain wall fermion action for light, charm and strange quarks. In conjunction with future experimental data, our form factor results for Bs → Klv and Bs → Dslv decays will provide a new method to extract the CKM matrix elements ΙVubΙ and ΙVcbΙ, test the forward backward asymmetry and measure the ratios R(K) and R(Ds). Similarly, Bs → øl+l- form factors will allow for the reconstruction of many observables that offer important tests of the Standard Model and New Physics scenarios.
Supervisor: Flynn, Jonathan Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.741734  DOI: Not available
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