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  • Access by Xinjiang University

Complete Lorentz-to-Galileo dictionary for direct dark matter detection

Eugenio Del Nobile*

  • School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom

  • *eugenio.delnobile@nottingham.ac.uk

Phys. Rev. D 98, 123003 – Published 10 December, 2018

DOI: https://doi.org/10.1103/PhysRevD.98.123003

Abstract

We determine the most general nonrelativistic theory of dark matter (DM)-nucleon scattering complying with the sole requirement of Lorentz invariance, for spin-0 and spin-1/2 DM. To do so, we first classify a comprehensive list of amplitude terms encompassing the most general Lorentz-covariant 2-to-2 DM-nucleon scattering amplitude. We then match each term to a Galilean-invariant operator at leading order in the nonrelativistic expansion, for both elastic and inelastic (endothermic and exothermic) scattering. Our complete Lorentz-to-Galileo mapping can be used to promptly determine the nonrelativistic DM-nucleon interaction and the associated nuclear form factor for any given Lorentz-invariant DM model. It applies to both renormalizable and nonrenormalizable theories (such as effective field theories at all orders), at any order of a perturbative expansion. We use our results to prove that, at leading order, Lorentz invariance does not impose restrictions on the set of 16 Galilean-invariant operators commonly used to parametrize the nonrelativistic DM-nucleon interaction. We also predict the lowest effective-operator dimension at which the nonrelativistic operators appear in the effective field theory of a singlet DM particle.

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