I When to use Feynman or Schwinger Parametrization

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The discussion centers on the use of Feynman and Schwinger parametrizations in calculations involving propagators with different powers of loop momentum in the denominator, particularly in HQET and QCD contexts. Users express a preference for Feynman parametrization but question the conditions under which each technique should be applied. It is noted that some texts favor Schwinger parametrization without clear explanations of its restrictions. The consensus suggests that the choice between the two methods may not significantly impact the results. Ultimately, understanding the context and specific calculations is crucial for selecting the appropriate parametrization technique.
Elmo
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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.
 
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Hm, I'm more used to the Feynman parametrization. I don't think that it makes much of a difference which one you use.
 

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