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TFM_Ast_Katanaeva_Alisa.pdf (2.31 MB)

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Master thesis

Publication date

2015-09

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cc-by-nc-nd (c) Katanaeva, 2015
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/96759

Oblique corrections in the Dine-Fischler-Srednicki-Zhitnitsky axion model

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Abstract

In the Minimal Standard Model (MSM) there is no degree of freedom for dark matter. There are several extensions of the MSM introducing a new particle - an invisible axion, which can be regarded as a trustworthy candidate at least for a part of the dark matter component. However, as it is extremely weakly coupled, it cannot be directly measured at the LHC. We propose to explore the electroweak sector indirectly by considering a particular model that includes the axion and deriving consequences that could be experimentally tested. We discuss the Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) model, which extends the two-Higgs doublet model with an additional Peccei-Quinn symmetry and leads to a physically acceptable axion. The non-linear parametrization of the DFSZ model is exploited in the generic case where all scalars except the lightest Higgs and the axion have masses at or beyond the TeV scale. We compute the oblique corrections and use their values from the electroweak experimental fits to put constraints on the mass spectrum of the DFSZ model.

Description

Màster Oficial d'Astrofísica, Física de Partícules i Cosmologia, Facultat de Física, Universitat de Barcelona, Curs: 2014-2015, Tutor: Domènec Espriu

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Partícules (Física nuclear), Matèria fosca (Astronomia), Interaccions febles (Física nuclear), Treballs de fi de màster

Subject (English)

Particles (Nuclear physics), Dark matter (Astronomy), Weak interactions (Nuclear physics), Master's theses

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Màster Oficial - Astrofísica, Física de Partícules i Cosmologia

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KATANAEVA, Alisa. Oblique corrections in the Dine-Fischler-Srednicki-Zhitnitsky axion model. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/96759

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