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Reference.org
Loop integral
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<p>In <a href="/facts/Quantum_field_theory/VoewsNJV">quantum field theory</a> and <a href="/facts/Statistical_mechanics/6zMsNYYG">statistical mechanics</a>, loop integrals are the integrals which appear when evaluating the <a href="/facts/Feynman_diagram/BRFNvDdr">Feynman diagrams</a> with one or more loops by integrating over the internal momenta. These integrals are used to determine counterterms, which in turn allow evaluation of the <a href="/facts/Beta_function_(physics)/SXngV1wF">beta function</a>, which encodes the dependence of coupling g {\displaystyle g} for an interaction on an energy scale μ {\displaystyle \mu } . </p>