Abstract
Effective field theories such as Heavy Quark Effective Theory (HQET) and Non Relativistic Quantum Chromo-(Electro-) dynamics NRQCD (NRQED) are indispensable tools in controlling the effects of the strong interaction. The increasing experimental precision requires the knowledge of higher dimensional operators. We present a general method that allows for an easy construction of HQET or NRQCD (NRQED) operators that contain two heavy quark or non-relativistic fields and any number of covariant derivatives. As an application of our method, we list these terms in the 1/M 4 NRQCD Lagrangian, where M is the mass of of the spin-half field.
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Gunawardana, A., Paz, G. On HQET and NRQCD operators of dimension 8 and above. J. High Energ. Phys. 2017, 137 (2017). https://doi.org/10.1007/JHEP07(2017)137
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DOI: https://doi.org/10.1007/JHEP07(2017)137