HGU-CAP 002 arXiv:1002.2525v2 [hep-ph] 13 Feb 2010 1 $^{∗}$Electronic address: okadan@ua.edu $^{†}$Electronic address: seto@phyics.umn.edu Higgs portal dark matter in the minimal gauged U $^{(1)$_{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 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 the stability 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-handed neutrino 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: Abstract