Nonabelian kinetic mixing in a confining phase: a framework for composite dark photons

• Published in: The journal of high energy physics 2024-02, Vol.2024 (2), p.17-25, Article 17
• Main Authors: Alonso-Álvarez, Gonzalo, Cao, Ruike, Cline, James M., Moorthy, Karishma, Xiao, Tianzhuo
• Format: Article
• Language: English
• Subjects: Astronomical models; Asymmetry; Atoms & subatomic particles; Big bang cosmology; Broken symmetry; Classical and Quantum Gravitation; Compositeness; Confining; Constraint modelling; Cosmology; Cosmology of Theories BSM; Couplings; Dark matter; Elementary Particles; Models for Dark Matter; Nuclear fusion; Nuclei (nuclear physics); Particle Nature of Dark Matter; Phenomenology; Photons; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Theoretical Physics; Relativity Theory; String Theory; Symmetry
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP02(2024)017

A bstract Dark matter from a hidden sector with SU( N ) gauge symmetry can have a nonabelian kinetic mixing portal with the standard model. The dark photon becomes massive in the confining phase without the need for spontaneous symmetry breaking. Depending on the particle content of the dark sector, there can be two or more composite vectors that get kinetic mixing through a heavy mediator particle X . This provides a model of composite dark photons giving a portal for direct detection of dark baryons. Avoiding exotic charged relics requires additional couplings allowing X to decay to dark quarks and standard model fields, leading to further portals between the dark matter and the standard model. We comprehensively study the constraints on such models from colliders, rare decays, direct detection, and big bang nucleosynthesis.