According to our current understanding of physics, specifically the theory of relativity, all particles, as well as their interactions and behaviors, are described within the framework of relativistic theories. The theory of relativity, both special and general relativity, has been extensively tested and confirmed by numerous experiments and observations.
Relativity theory provides a comprehensive description of the behavior of particles, including their motion, energy, momentum, and the interactions between them. It has been remarkably successful in explaining a wide range of phenomena, from the behavior of particles at high speeds to the bending of light in gravitational fields.
To date, no experimental evidence or observations have been reported that contradict the predictions of relativity theory for known particles and their interactions. The theory of relativity has stood up to rigorous testing and has been confirmed in countless experiments and observations, including those conducted at high-energy particle accelerators such as the Large Hadron Collider (LHC).
However, it's worth noting that our understanding of the universe is not complete, and there are still many open questions and areas of active research in physics. There could be phenomena or particles that lie beyond our current knowledge and theoretical frameworks. Future discoveries or developments in physics may lead to the refinement or extension of our existing theories, but any such modifications would need to be consistent with the extensive experimental evidence gathered so far.