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Improved Limits for Higgs-Portal Dark Matter from LHC Searches

MPG-Autoren
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Schwenk,  Achim
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Hoferichter, M., Klos, P., Menendez, J., & Schwenk, A. (2017). Improved Limits for Higgs-Portal Dark Matter from LHC Searches. Physical Review Letters, 119(18): 181803. doi:10.1103/PhysRevLett.119.181803.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-0071-F
Zusammenfassung
Searches for invisible Higgs decays at the Large Hadron Collider constrain dark matter Higgs-portal models, where dark matter interacts with the standard model fields via the Higgs boson. While these searches complement dark matter direct-detection experiments, a comparison of the two limits depends on the coupling of the Higgs boson to the nucleons forming the direct-detection nuclear target, typically parametrized in a single quantity f(N). We evaluate f(N) using recent phenomenological and lattice-QCD calculations, and include for the first time the coupling of the Higgs boson to two nucleons via pion-exchange currents. We observe a partial cancellation for Higgs-portal models that makes the two-nucleon contribution anomalously small. Our results, summarized as f(N) = 0.308(18), show that the uncertainty of the Higgs-nucleon coupling has been vastly overestimated in the past. The improved limits highlight that state-of-the-art nuclear physics input is key to fully exploiting experimental searches.