TL;DR
This paper revisits Weinberg's criterion for particle compositeness, emphasizing its relevance in the context of effective field theories, especially with the recent discovery of exotic hadrons.
Contribution
It explores the application of Weinberg's compositeness criterion within a model-independent effective field theory framework, connecting historical ideas to modern hadron discoveries.
Findings
Weinberg's criterion remains a valuable tool for understanding particle structure.
Effective field theories provide a robust context for compositeness analysis.
The approach aids in interpreting exotic hadron states.
Abstract
Nearly 60 years ago Weinberg suggested a criterion for particle "compositeness", which has acquired new life with the discovery of new, exotic hadrons. His idea resonates with model-based intuition. I discuss the role it plays in the context of another of Weinberg's creations, the model-independent framework of effective field theories.
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