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	有効場理論	PDFフィッティング
分野	素粒子物理学	素粒子物理学
系統	Process / pipeline	Process / pipeline
提唱年	1979	1969
提唱者	Steven Weinberg	James Bjorken and collaborators
種類	Model-independent approach	QCD framework
原典	Weinberg, S. (1979). Baryon and lepton nonconserving processes. Physical Review Letters, 43(21), 1566.	Bjorken, J. D. (1969). Asymptotic sum rules at infinite momentum. Physical Review, 179(5), 1547.
別名	EFT, effective theory, operator product expansion	PDF, structure function, parton model
関連	3	3
概要	Effective Field Theory (EFT) is a general framework for studying physics at low energies in terms of the relevant degrees of freedom, without requiring complete knowledge of high-energy physics. By expanding in powers of energy, EFT provides model-independent parameterizations of new physics effects and systematic methods for computing precision predictions of the Standard Model.	Parton Distribution Function (PDF) fitting is the process of determining the probability distributions of quarks and gluons inside hadrons using high-energy collision data. PDFs are fundamental inputs to all hadron collider phenomenology, essential for predicting cross-sections, designing triggers, and interpreting new physics searches at the Large Hadron Collider.