Augury of darkness: the low-mass dark Z ' portal

Augury of darkness: the low-mass dark Z ' portal

Author Alves, Alexandre Autor UNIFESP Google Scholar
Arcadi, Giorgio Google Scholar
Mambrini, Yann Google Scholar
Profumo, Stefano Google Scholar
Queiroz, Farinaldo S. Google Scholar
Abstract Dirac fermion dark matter models with heavy Z ' mediators are subject to stringent constraints from spin-independent direct searches and from LHC bounds, cornering them to live near the Z ' resonance. Such constraints can be relaxed, however, by turning off the vector coupling to Standard Model fermions, thus weakening direct detection bounds, or by resorting to light Z ' masses, below the Z pole, to escape heavy resonance searches at the LHC. In this work we investigate both cases, as well as the applicability of our findings to Majorana dark matter. We derive collider bounds for light Z ' gauge bosons using the CLS method, spin-dependent scattering limits, as well as the spin-independent scattering rate arising from the evolution of couplings between the energy scale of the mediator mass and the nuclear energy scale, and indirect detection limits. We show that such scenarios are still rather constrained by data, and that near resonance they could accommodate the gamma-ray GeV excess in the Galactic center.
Keywords Cosmology of Theories beyond the SM
Beyond Standard Model
xmlui.dri2xhtml.METS-1.0.item-coverage New York
Language English
Sponsor CNPq
U.S. Department of Energy
Research Executive Agency (REA) of the European Union
European Union
Grant number CNPq: 307098/ 2014-1
FAPESP: 2013/22079-8
U.S. Department of Energy: DE-SC0010107
Research Executive Agency (REA) of the European Union: PITN-GA2012-316704
European Union: 674896
Date 2017
Published in Journal Of High Energy Physics. New York, v. , n. 4, p. -, 2017.
ISSN 1029-8479 (Sherpa/Romeo, impact factor)
Publisher Springer
Extent -
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000401067200003

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