arXiv:1002.2525v2  [hep-ph]  13 Feb 2010
HGU-CAP 002
Higgs portal dark matter in the minimal gaugedU(1)B−L model
Nobuchika Okada ∗
Department of Physics and Astronomy,
University of Alabama, Tuscaloosa, AL 35487, USA
Osamu Seto †
Department of Architecture and Building Engineering,
Hokkai-Gakuen University, Sapporo 062-8605, Japan
Abstract
We propose a scenario of the right-handed neutrino dark matter in the context of the minimal
gauged U(1)B−L model by introducing an additional parity which ensures thestability of dark
matter particle. The annihilation of this right-handed neutrino takes place dominantly through the
s-channel Higgs boson exchange, so that this model can be called Higgs portal dark matter model.
We show that the thermal relic abundance of the right-handedneutrino dark matter with help of
Higgs resonance can match the observed dark matter abundance. In addition we estimate the cross
section with nucleon and show that the next generation direct dark matter search experiments can
explore this model.
PACS numbers:
∗ Electronic address: okadan@ua.edu
†Electronic address: seto@phyics.umn.edu
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