{"knowledge_schema": {"broad_category": "Particle Physics \u2192 Decay Processes", "refinement": "This problem involves analyzing the decay channels of a bosonic particle (Y) based on its mass and interaction with fermions.", "specific_scope": "The focus is on identifying the kinematically allowed decay modes of the boson Y, which has a mass of 8 GeV, at the lowest order.", "goal": "Determine which decay channels are allowed based on the mass of the boson and the masses of the potential decay products."}, "summary": "In this problem, we analyze the decay processes of a boson Y with a mass of 8 GeV. The task is to identify the kinematically allowed decay channels at the lowest order. Given the mass of Y, we can consider the possible decay products, which include various fermion-antifermion pairs and lepton pairs. The correct answer indicates that Y can decay into lighter quark-antiquark pairs (cc\u0305, ss\u0305, uu\u0305, dd\u0305) and lepton pairs (\u03c4^+\u03c4^-, \u03bc^+\u03bc^-, e^+e^-), as these decay products are all below the mass threshold of 8 GeV."}