Understanding the impact of non-local contributions to  B ̄0 →K ̄*0 μμ transitions

  • Gabby J Pomery

Student thesis: Doctoral ThesisDoctor of Philosophy (PhD)


The impact of the non-local contributions to B ̄0 → K ̄∗0μ+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 B ̄0 and B0 decays are treated equally in this analysis, thus providing a sample rich in B ̄0(B0) → K ̄∗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 B ̄0 → K ̄∗0μ+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 B ̄0 → K ̄∗0μ+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.
Date of Award23 Jan 2020
Original languageEnglish
Awarding Institution
  • The University of Bristol
SupervisorKonstantinos A. Petridis (Supervisor)

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