{"knowledge_schema": {"broad_category": "Physics \u2192 Particle Physics \u2192 Conservation of Energy and Momentum", "refinement": "This problem involves the annihilation of particles and the subsequent production of new particles, focusing on energy and momentum conservation principles.", "specific_scope": "The scenario describes the annihilation of a moving antineutron with a neutron, resulting in the creation of two B mesons, and requires calculating the velocity of the produced particles based on their rest mass energy and conservation laws.", "goal": "Determine the velocity of the B mesons produced in the annihilation process using conservation of energy and momentum."}, "summary": "This problem is rooted in particle physics, specifically dealing with the annihilation of particles and the conservation of energy and momentum. In this scenario, an antineutron collides with a neutron, resulting in the production of two B mesons. To find the velocity of the B mesons, we apply the principles of conservation of energy and momentum, taking into account the rest mass energy of the B mesons. The calculated velocity of the B mesons is 0.72c, which corresponds to one of the provided answer choices."}