2022/10/20 by Fabian Zierler, Jong-Wan Lee, Zierler, Fabian +5
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #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.2210.11187
openalex publication_date 2022/10/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We explore some aspects of Sp(4) gauge theory with two fundamental fermions in the context of composite Goldstone Dark Matter. We present preliminary lattice results for the mass of the pseudoscalar iso-singlet meson η' using unimproved Wilson fermions and the standard plaquette action. We find that the η' is slightly heavier than the pseudoscalar non-singlets π and lighter than the vector mesons ρ for multiple ensembles with mπ/mρ≥ 0.77. This pattern is potentially relevant for Beyond the Standard Model physics model building. Furthermore, we show that for Nf=1+1 flavours the disconnected contributions to the unflavoured pseudoscalar π0 are small. We supplement this measurement by a calculation of the ππ scattering length a0 which shows that the ensemble studied might be phenomenologically relevant for Dark Matter models such as the Strongly Interacting Massive Particles paradigm.