Beyond the Standard Model: Leptoquark Explanations for R(D) and R(D*) Flavour Anomalies

Kwaśniak, Jakub (2024) Beyond the Standard Model: Leptoquark Explanations for R(D) and R(D*) Flavour Anomalies. Bachelor's Thesis, Physics.

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Abstract

The Standard Model of particle physics remains an extensive yet incomplete description of the physics behind fundamental particles and their interactions. Among the issues not addressed by the model are the lepton flavour anomalies, suggesting that the third generation of leptons requires an alternative description. The R(D) and R(D*) anomalies concerning the semileptonic tau decay mode of a B meson constitute a combined 3.3 sigma deviation from the Standard Model prediction. Potential explanations of these phenomena include novel bosonic particles -- leptoquarks, allowing for a direct transition mechanism between quarks and leptons. They appear naturally in generalisations of the Standard Model gauge group to Grand Unified Theories. In this work, three leptoquark models were presented as manifestations of the UV-complete SU(5), SO(10), and the Flavoured Gauge models. The scalar leptoquarks were determined to exist with a mass of an order of TeV within the unified SU(5) and SO(10) models, whereas the last vector leptoquark was identified to emerge from the non-universal gauge model, with a mass of approximately 1.6 TeV. The inclusion of any of the leptoquark particles was proven to resolve the R(D(*)) anomalies while simultaneously accounting for the agreement between certain other observables. A potential observation of one of these bosons would constitute evidence for a larger symmetry structure in the Universe.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Bruyn, K.A.M. de
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	05 Jul 2024 09:27
Last Modified:	05 Jul 2024 09:27
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/33052

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