Quarks beyond the top
(2014)
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- Abstract
- Since the beginning of its physics programme, the Large Hadron Collider has been delivering high quality results on the Standard Model of particle physics. After the discovery of a new resonance that matches the expectations for a scalar Higgs boson at a mass of 125 GeV, the forthcoming experiments will focus on New Physics searches. In the spotlight of the CMS and ATLAS collaborations, the possibility for new heavy quarks offers interesting clues about the issue of naturalness, and appears as a common feature in many scenarios going beyond the Standard Model. In this thesis, we present the phenomenological implications of tentative new quarks beyond the top, and investigate the processes in which their existence could possibly be unravelled. In synergy with the results of the CMS collaboration, we show that a sequential fourth generation of quarks and leptons can be ruled out with a high degree of confidence level in the context of a single Higgs doublet. Aiming at a systematic analysis, we then introduce a complete and model-independent framework to study the phenomenology of new top partners with general coupling assumptions to the Standard Model quarks. Relying on this parametrisation, we assess the possibility for chiral and vector-like quarks to be singly produced at the LHC, in conjunction with the constraints set from precision physics measurements. Finally, we present a dedicated software recasting the existing limits from the available searches on scenarios with one or multiple heavy quarks. The prospects for the forthcoming search programmes are discussed as a conclusion, stressing their importance to set bounds on extended fermion sectors at the TeV scale and beyond.
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Citations
Buchkremer, M. (2014). Quarks beyond the top. https://hdl.handle.net/2078.5/48969