This thesis documents two searches for rare hadronic decays of B<sup>+</sup> mesons with the LHCb experiment at the Large Hadron Collider. Both are performed using proton-proton collision data corresponding to an integrated luminosity of 4.8 fb<sup>-1</sup>, collected at centre-of-mass energies of 7, 8 and 13 TeV during 2011-2016. The first is a search for B<sup>+</sup> → D<sub>s</sub><sup>+</sup>K<sup>+</sup>K<sup>-</sup> decays. A significant signal is observed for the first time and the branching fraction is determined to be B(B<sup>+</sup> → D<sub>s</sub><sup>+</sup>K<sup>+</sup>K<sup>-</sup>) = (7.1 ± 0.5 ± 0.6 ± 0.7) x 10<sup>-6</sup>, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty on the branching fraction of the normalisation mode B<sup>+</sup> → Ds<sup>+</sup>D<sup>0</sup>. The second search is performed for the rare pure annihilation decay B<sup>+</sup> → D<sub>s</sub><sup>+</sup>φ. No significant signal is observed and a limit of B(B<sup>+</sup> → D<sub>s</sub><sup>+</sup>φ) < 4.9 x 10<sup>-7</sup> is set on the branching fraction at 95% confidence level.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:757918 |
| Date | January 2018 |
| Creators | Hadavizadeh, Thomas |
| Contributors | John, Malcolm |
| Publisher | University of Oxford |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://ora.ox.ac.uk/objects/uuid:98bd5c16-af0d-4832-9743-ac97d4407aec |
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