Renormalon
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In quantum field theory, a renormalon is a power-like infrared-sensitive contribution to a hard (high-energy) process, as opposed to the usual logarithmic infrared-sensitive effects encountered in quantum chromodynamics (QCD) calculations. For example, the relation between the pole mass of a quark Q and the physical observables from which it can be extracted suffers from a renormalon ambiguity, which is a relative correction of order ΛQCD / mQ. The usual logarithmic infrared-sensitive effects in QCD go like log(ΛQCD / mQ).
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