Abstract
We provide a self-contained discussion of how reparameterization invariance connects a rotationally-invariant heavy particle effective theory with a single heavy fermion to a Lorentz-invariant theory. Furthermore, using Hilbert-series methods, a Lorentz- invariant operator basis is tabulated, up to and including operators of order 1/M 4, when the fermion couples to an external U(1) or SU(3) gauge interaction.
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ArXiv ePrint: 1810.02356
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Kobach, A., Pal, S. Reparameterization invariant operator basis for NRQED and HQET. J. High Energ. Phys. 2019, 12 (2019). https://doi.org/10.1007/JHEP11(2019)012
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DOI: https://doi.org/10.1007/JHEP11(2019)012