arXiv Analytics

Sign in

arXiv:1306.6939 [hep-ph]AbstractReferencesReviewsResources

Nuclear σ-terms and Scalar-Isoscalar WIMP-Nucleus Interactions from Lattice QCD

S. R. Beane, S. D. Cohen, W. Detmold, H. -W. Lin, M. J. Savage

Published 2013-06-28, updated 2015-03-18Version 2

It has been argued that the leading scalar-isoscalar WIMP-nucleus interactions receive parametrically enhanced contributions in the context of nuclear effective field theories. These contributions arise from meson-exchange currents (MECs) and potentially modify the impulse approximation estimates of these interactions by 10--60%. We point out that these MECs also contribute to the quark mass dependence of nuclear binding energies, that is, nuclear \sigma-terms. In this work, we use recent lattice QCD calculations of the binding energies of the deuteron, He-3 and He-4 at pion masses near 500 MeV and 800 MeV, combined with the experimentally determined binding energies at the physical point, to provide approximate determinations of the \sigma-terms for these light nuclei. For each nucleus, we find that the deviation of the corresponding nuclear \sigma-term from the single-nucleon estimate is at the few percent level, in conflict with the conjectured enhancement. As a consequence, lattice QCD calculations currently indicate that the cross sections for scalar-isoscalar WIMP-nucleus interactions arising from fundamental WIMP interactions with quarks do not suffer from significant uncertainties due to enhanced meson-exchange currents.

Related articles: Most relevant | Search more
arXiv:hep-ph/9812288 (Published 1998-12-09)
Lattice QCD Calculations of Leptonic and Semileptonic Decays
arXiv:1903.11902 [hep-ph] (Published 2019-03-28)
Nucleon Structure from Lattice QCD Calculations
arXiv:1702.02243 [hep-ph] (Published 2017-02-08)
Phenomenology of $Λ_b \to Λ_c τ\barν_τ$ using lattice QCD calculations