Atomic Nuclear Physics

Applied asymptotic expansions in momenta and masses by Vladimir A. Smirnov

By Vladimir A. Smirnov

The publication provides asymptotic expansions of Feynman integrals in numerous limits of momenta and lots more and plenty, and their purposes to difficulties of actual curiosity. the matter of enlargement is systematically solved by means of formulating common prescriptions that categorical phrases of the growth utilizing the unique Feynman imperative with its integrand improved right into a Taylor sequence in applicable momenta and lots more and plenty. wisdom of the constitution of the asymptotic enlargement on the diagrammatic point is essential in knowing tips on how to practice expansions on the operator point. most common examples of those expansions are awarded: the operator product enlargement, the large-mass enlargement, Heavy Quark powerful conception, and Non-Relativistic QCD.

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Example text

57) and easily obtain an explicit result, FΓ (q) = iπ 2 ln 1 − q 2 /m2 . 58) Suppose we now want to perform evaluation for general d. There could be various reasons for doing this. First, when using the method of integration by parts (see below), one obtains expressions with coefficients involving negative powers of ε. Second, when one performs renormalization, insertion of counterterms also generates diagrams with coefficients singular in ε. In any case, it is often necessary to know not only the pole and the finite part of a diagram but also some initial terms of its Laurent expansion in ε.

J } of disjoint divergent 1PI subgraphs, with ∆(∅) = 1. The ‘incomplete’ R-operation R , by definition, includes all the counterterms except the overall counterterm ∆(Γ ). e. does not have divergent subgraphs, the operation is of the form RFΓ = [1 + ∆(Γ )] FΓ . 84) denotes the Feynman integral that differs from FΓ/γ by insertion of the polynomial Pγ in the external momenta and internal masses of γ into the vertex vγ to which the subgraph γ was reduced. The degree of each Pγ equals the degree of divergence ω(γ).

58) Suppose we now want to perform evaluation for general d. There could be various reasons for doing this. First, when using the method of integration by parts (see below), one obtains expressions with coefficients involving negative powers of ε. Second, when one performs renormalization, insertion of counterterms also generates diagrams with coefficients singular in ε. In any case, it is often necessary to know not only the pole and the finite part of a diagram but also some initial terms of its Laurent expansion in ε.

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