Beek, Leander, van (2021) Constraining the contributions of Penguin diagrams to the phase shift of phi_s through B to DD decays. Master's Thesis / Essay, Physics.
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Abstract
In this thesis, the measurement of the CKM-parameter phi_s from B to DD-meson decays will be analysed, taking the next-to-leading order Penguin diagrams into account. This is a requirement to correctly interpret higher precision measurements of this Standard Model parameter or constrain contributions of New Physics. Sizing these corrections is done by determining the Penguin parameters from the B_d to D_d^+ D_d^- decay, which can be related to the B_s to D_s^+ D_s^- decay by U-spin symmetry. The analysis results in a correction of Delta phi_s = (-0.2 \pm 0.6) degree. The measurements of phi_s^{eff} = (1.0 \pm 9.7) degree are correspondingly shifted towards phi_s^corr = (1 \pm 10)°. The shift brings the measurement closer to the Standard Model prediction, but at current precision the corrections of the Penguin parameters are still in the margin of error. An estimate is made of the implications of the reducing uncertainty while measurements are being taken.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Bruyn, K.A.M. de |
| Degree programme: | Physics |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 06 May 2021 09:01 |
| Last Modified: | 06 May 2021 09:01 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/24355 |
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