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- TL;DR Summary
- A slight confusion about HQET Feynman rules ,as stated in most texts.

Several texts state the vertex HQET Feynman rule as : igT

v

So in general, shouldn't the vertex rule be the same as in QCD ? The only difference being the heavy quark propagator.

_{ij}v^{μ}\frac{1}{1+\slashed{v}} with the reasoning for v_{μ}presented as being due to the QCD interaction vertex being between two heavy quark propagators, which are \frac{1+\slashed{v}}{2v.k}, giving :v

^{μ}\frac{1+\slashed{v}}{2}=\frac{1+\slashed{v}}{2}γ^{μ}\frac{1+\slashed{v}}{2}.So in general, shouldn't the vertex rule be the same as in QCD ? The only difference being the heavy quark propagator.

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