Hi everyone. I have been studying the Heavy Quark Effective Theory and at a certain point we have a Lagrangian like:(adsbygoogle = window.adsbygoogle || []).push({});

$$

\mathcal{L}=\bar h_v iD\cdot v h_v+\bar h_vi\gamma_\mu D^\mu_\perp\frac{1}{iD\cdot v+2m_Q}i\gamma_\nu D_\perp^\nu h_v.

$$

[itex]h_v[/itex] is the field representing the heavy quark, [itex] v[/itex] is the velocity of the heavy quark and [itex]D_\mu[/itex] is the usual covariant derivative.

I read that this Lagrangian is non-local but I can't understand why. Do you have any idea?

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# Non-local interaction in HQET

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