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Title: Exploring b to s electroweak penguin decays at LHCb
Author: Shires, Alexander
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2013
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The angular distribution of B0 [to] K*0μ+μ− was studied using 1.0 fb−1 of pp collisions recorded at the LHCb detector at the LHC. Angular observables are measured in five independent bins of the di-muon invariant mass squared, q2, and the theoretically interesting region from 1 < q2 < 6GeV2/c4. The results are in good agreement with Standard Model predictions. The contribution from a K S-wave is included in the angular distribution of B0 to K+π −ℓ+ℓ−. The K S-wave is shown to have an overall dilution effect on measurements of the B0 [to] K+π −ℓ+ℓ− angular observables. For an S-wave contribution of 7% between a Kπ invariant mass squared of 0.64 < p2 < 1.0GeV2/c4, there is a significant bias on the angular observables for dataset of over 500 events. It is possible to remove this bias by incorporating the S-wave into the angular distribution and by fitting the Kπ mass spectrum. The fraction of the S-wave in B0 [to] K*0μ+μ−, FS, was analysed in seven bins of q2 using 1.0 fb−1 of data from LHCb. The value of FS in the region from 1 < q2 < 6GeV2/c4 and from 0.64 < p2 < 1.0GeV2/c4 was found to be [Equation appears here. To view, please open pdf attachment]. In the regions where no S-wave is found, 95% confidence limits are given. These measurements show that the Kπ S-wave will be a vital consideration for future measurements of B0 [to] K 0ℓ+ℓ−.
Supervisor: Egede, Ulrik Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available