Crocombe, Andrew (2018) Studies of rare B-> Kπμμ decays using the LHCb experiment. PhD thesis, University of Warwick.

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Abstract

Within the Standard Model of particle physics, decays involving flavour-changing neutral current transitions cannot occur via tree-level Feynman diagrams and can only occur at loop level or higher. This leads to a heavy suppression of decay modes of this type and makes them sensitive to contributions from particles beyond the Standard Model that can enter in competing Feynman diagrams. By performing measurements of the rate and angular distribution of these decay modes, powerful tests of the Standard Model can be carried out.

In this thesis, a first search for the decay B0 s →K&0μ+μ- is presented using data samples collected by the LHCb collaboration during Run 1 and Run 2 of the LHC. An excess of this decay is found over the background-only hypothesis, providing first evidence for the decay mode with a significance of 3.4 standard deviations. A _first measurement of the branching fraction of this decay is made and a discussion of the future prospects for measurements of the decay mode is presented.

Item Type:	Thesis (PhD)
Subjects:	Q Science > QC Physics
Library of Congress Subject Headings (LCSH):	Feynman diagrams, Particles (Nuclear physics), Beta decay, Muons -- Decay
Official Date:	September 2018
Dates:	Date Event September 2018 UNSPECIFIED
Institution:	University of Warwick
Theses Department:	Department of Physics
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Blake, Thomas
Format of File:	pdf
Extent:	vi,158 leaves : illustrations, charts
Language:	eng

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