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Title: Understanding the impact of non-local contributions to B̅⁰ → K̅*⁰ μ⁺μ⁻ transitions
Author: Pomery, Gabby J.
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2020
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The impact of the non-local contributions to B̅⁰ → K̅*⁰ μ⁺μ⁻ decays has been assessed through creating a framework suitable to perform a five dimensional, unbinned, maximum likelihood fit to the data collected by the LHCb experiment. Both B̅⁰ and B⁰ decays are treated equally in this analysis, thus providing a sample rich in B̅⁰(B⁰) → K̅*⁰(K*⁰) μ⁺μ⁻ candidates. The data analysed corresponds to the full Run 1 dataset which equates to an integrated luminosity of 3 fb⁻¹, and the 2016 dataset from Run 2 that amounts to an integrated luminosity of 1.67 fb⁻¹. The model considers all possible hadronic contributions that contribute to B̅⁰ → K̅*⁰ μ⁺μ⁻ decays, in the invariant dilepton mass squared (q²) region of 1.0 < q² < 18.0 GeV²/c⁴. No previous analyses have been published that determine the impact of the non-local contributions in B̅⁰ → K̅*⁰ μ⁺μ⁻ decays. Therefore, for the first time, the analysis presented in this thesis tries to understand these contributions. Recent results published from LHCb reveal anomalous results seen in b → sℓ⁺ℓ⁻ transitions. Possible explanations include New Physics, at the TeV scale, or hadronic resonances interfering with the penguin component and causing a sizeable effect that appears like New Physics. This analysis through a fit to the data will determine the latter, demonstrating how the effects seen could be due to our lack of understanding of the non-local contributions.
Supervisor: Petridis, Konstantinos Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available