SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 60: Theory BMS

T 60.4: Vortrag

Mittwoch, 22. März 2023, 16:35–16:50, HSZ/0201

Scalar Potential in SU(6) Gauge-Higgs Grand Unification — Andreas Bally, Florian Goertz, •Maya Hager, and Aika Marie Tada — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Composite Grand Unified Theories unify the Standard-Model gauge symmetries and their breaking in a single structure while at the same time offering a solution to the hierarchy problem. In these scenarios, the corrections to the Higgs mass are expected to be at the order of the compositeness scale around a few TeV, significantly decreasing the necessary level of fine-tuning. In the recently proposed SU(6) Gauge-Higgs GUT (GHGUT) by Angelescu et al., the Higgs emerges as a pseudo Nambu-Goldstone boson of the coset SU(6)/SU(5) along with a scalar leptoquark and a scalar singlet. The scalar potential is generated radiatively through explicit symmetry breaking induced by the coupling to elementary fields. To describe the dynamics of the SU(6) GHGUT we work in a 4-dimensional framework using the AdS/CFT correspondence and we employ the Callan-Coleman-Wess-Zumino (CCWZ) mechanism to find the zero temperature potential. The 4D method enables a better analytical understanding of the scalar potential than the numerical study in five dimensions done previously. In addition, it can shed light on open problems such as baryogenesis, for which we include the finite temperature potential. A small hierarchy remains between the scales and we look at the fine tuning needed to achieve a realistic Higgs mass and vev. Furthermore, phenomenological aspects are investigated, such as the modification of couplings with respect to the SM, or the bounds on the lightest composite resonances.