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- A question about loop calculations by Feynman and Schwinger parameterization

I had been doing some calculations involving propagators with both a quadratic and a linear power of loop momentum in the denominator. In the context of HQET and QCD with strategy of regions.

The texts which I am following sometimes tend to straightaway use Schwinger and I am just wondering if there are any restrictions/conditions in the use of each of these techniques.

The texts which I am following sometimes tend to straightaway use Schwinger and I am just wondering if there are any restrictions/conditions in the use of each of these techniques.