2024/01/22 by Francesco Loparco, Loparco, Francesco · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2401.11999
openalex publication_date 2024/01/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Flavour changing neutral current (FCNC) processes are described by loop diagrams in the Standard Model (SM), while in 331 models, based on the gauge group SU(3)C × SU(3)L × U(1)X, they are dominated by tree-level exchanges of a new heavy neutral gauge boson Z'. Exploiting this feature, observables related to FCNC decays of K, Bd and Bs mesons can be considered in several variants of 331 models. The variants are distinguished by the value of a parameter β that plays a key role in this framework. Imposing constraints on the ΔF = 2 observables, we select possible ranges for the mass of the Z' boson in correspondence to the values β= ± k / √(3), with k = 1, 2. The results are used to determine the impact of 331 models on b → s processes and on the correlations among them, in the light of new experimental data recently released.