- Renormalon
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 inquantum chromodynamics (QCD) calculations. For example, the relation between the pole mass of aquark "Q" and the physical observables from which it can be extracted suffers from a renormalon ambiguity, which is a relative correction of order Lambda_{QCD}/m_Q. The usual logarithmic infrared-sensitive effects in QCD go like log(Lambda_{QCD}/m_Q).
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