Article I: The Resonant Event Threshold and the Domain of Validity of the Quantum Description

This paper introduces the concept of a resonant event threshold as a physical criterion delimiting the domain of validity of quantum descriptions. The central claim is that quantum formalism applies to physical processes only within regimes where energy, time, and coherence jointly permit the realization of an event. Outside this domain, quantum states remain processual and non-realized, and quantities such as outcomes, probabilities, or information lack physical meaning. The proposed threshold, expressed schematically as νΔt ≳ 1 (with ν a characteristic frequency and Δt an effective coherence/interaction time), is not a new dynamical law but a condition of applicability: it specifies when a quantum description corresponds to a realizable physical event. This work serves as a foundational element of a broader series developing a process–event framework for quantum theory, clarifying the status of collapse, information, and measurement without modifying standard quantum formalism.