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MON: Monday Contributed Sessions

MON 10: Standard Model and Beyond

MON 10.3: Talk

Monday, September 8, 2025, 14:45–15:00, ZHG103

Extensions of Minimal SU(5) GUT — •Clive Reese — Georg-August Univesity, Göttingen, Germany

Grand Unified Theories (GUTs) extend the Standard Model (SM) embedding the SM gauge groups into one larger group that spontaneously breaks down to the SM at high energy scales. Thereby they predict the unification of gauge couplings and explain the charge quantization of the fermions. However, the minimal non-supersymmetric scenario based on the SU(5) group predicts too fast proton decay. In our work we extend the scalar sector of the model and study the resulting parameter space to find out if it is possible to obtain unification of the couplings at higher scale and to reconcile large masses for the proton decay mediators, while keeping the SM Higgs naturally light.

Keywords: Grand Unified Theory; Proton Decay; Standard Model; Higgs