Chiral power counting of one- and two-body currents in direct detection of dark matter

Hoferichter, Martin (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany) ; Klos, Philipp (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany) ; Schwenk, Achim (Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany) (ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany)

20 May 2015

Abstract: We present a common chiral power-counting scheme for vector, axial-vector, scalar, and pseudoscalar WIMP–nucleon interactions, and derive all one- and two-body currents up to third order in the chiral expansion. Matching our amplitudes to non-relativistic effective field theory, we find that chiral symmetry predicts a hierarchy amongst the non-relativistic operators. Moreover, we identify interaction channels where two-body currents that previously have not been accounted for become relevant.


Published in: Physics letters B 746 (2015) 410-416
Published by: Elsevier
DOI: 10.1016/j.physletb.2015.05.041
License: CC-BY-3.0



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