Bosonic-seesaw portal dark matter

Ishida, Hiroyuki (Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan) ; Matsuzaki, Shinya (Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan) (Department of Physics, Nagoya University, Nagoya 464-8602, Japan) ; Yamaguchi, Yuya (Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan)

17 October 2017

Abstract: We discuss a new type of Higgs-portal dark matter (DM) production mechanism, called the bosonic-seesaw portal (BSP) scenario. The BS provides the dynamical origin of the electroweak symmetry breaking, triggered by mixing between the elementary Higgs and a composite Higgs generated by a new-color strong dynamics, hypercolor (HC). At the HC strong coupling scale, the classical-scale invariance assumed in the model is dynamically broken, as well as the “chiral” symmetry present in the HC sector. In addition to the composite Higgs, HC baryons emerge to potentially be stable because of the unbroken HC baryon number symmetry. Hence the lightest HC baryon can be a DM candidate. Of interest in the present scenario is that HC pions can be as heavy as the HC baryon due to the possibly enhanced explicit “chiral”-breaking effect triggered after the BS mechanism, so the HC baryon pair cannot annihilate into HC pions. As in the standard setup of the freeze-in scenario, it is assumed that the DM was never in the thermal equilibrium, which ends up with no thermal abundance. It is then the non-thermal BSP process that crucially comes into the game below the HC scale: the HC baryon significantly couples to the standard-model Higgs via the BS mechanism, and can non-thermally be produced from the thermal plasma below the HC scale, which turns out to allow the TeV mass scale for the composite baryonic DM, much smaller than the generic bound placed in the conventional thermal freeze-out scenario, to account for the observed relic abundance. Thus the DM can closely be related to the mechanism of the electroweak symmetry breaking.


Published in: PTEP 2017 (2017) 103B01
Published by: Oxford University Press/Physical Society of Japan
DOI: 10.1093/ptep/ptx132
License: CC-BY-3.0



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