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Title: Z-portal dark matter

We propose to generalize the extensions of the Standard Model where the Z boson serves as a mediator between the Standard Model sector and the dark sector χ. We show that, like in the Higgs portal case, the combined constraints from the recent direct searches restrict severely the nature of the coupling of the dark matter to the Z boson and set a limit m{sub χ}≳200 GeV (except in a very narrow region around the Z-pole region). Using complementarity between spin dependent, spin independent and FERMI limits, we predict the nature of this coupling, more specifically the axial/vectorial ratio that respects a thermal dark matter coupled through a Z-portal while not being excluded by the current observations. We also show that the next generation of experiments of the type LZ or XENON1T will test Z-portal scenario for dark matter mass up to 2 TeV. The condition of a thermal dark matter naturally predicts the spin-dependent scattering cross section on the neutron to be σ{sub χn}{sup SD}≃10{sup −40} cm{sup 2}, which then becomes a clear prediction of the model and a signature testable in the near future experiments.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Laboratoire de Physique Théorique Université Paris-Sud, F-91405 Orsay (France)
  2. (Germany)
  3. Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRS and Université Paris-Sud 11 Centre Scientifique d’Orsay, B. P. 34, F-91898 Orsay Cedex (France)
Publication Date:
OSTI Identifier:
22454522
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 03; Other Information: PUBLISHER-ID: JCAP03(2015)018; OAI: oai:repo.scoap3.org:9533; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Sponsoring Org:
SCOAP3, CERN, Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CROSS SECTIONS; GEV RANGE; HIGGS MODEL; NEUTRONS; NONLUMINOUS MATTER; SCATTERING; SPIN; STANDARD MODEL; TEV RANGE; Z NEUTRAL BOSONS