2011/11/30 by Zachary Burell, Zachary M. Burell, Nobuchika Okada
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.85.055011
published as Phys. Rev. D 85, 055011 (2012) · 16 pages, 3 figures, version to appear in Phys. Rev. D
arxiv created 2012/03/05 · openalex publication_date 2012/03/16 · arxiv updated 2012/05/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We propose a supersymmetric extension of the minimal B\ensuremath-L model where we consider a new Z2-parity under which one right-handed neutrino is assigned odd parity. When the Majorana Yukawa coupling of a Z2-even right-handed neutrino is large, radiative corrections will drive the mass squared of the corresponding right-handed sneutrino to negative values, breaking the B\ensuremath-L gauge symmetry at the TeV scale in a natural way. Additionally, R-parity is broken and thus the conventional supersymmetric dark matter candidate, the neutralino, is no longer viable. Thanks to the Z2-parity, the Z2-odd right-handed neutrino remains a stable dark matter candidate even in the presence of R-parity violation. We demonstrate that the dark matter relic abundance with an enhanced annihilation cross-section by the B\ensuremath-L gauge boson (Z^\ensuremath') resonance is in accord with the current observations. Therefore, it follows that the mass of this dark matter particle is close to half of the Z^\ensuremath' boson mass. If the Z^\ensuremath' boson is discovered at the Large Hadron Collider (LHC), it will give rise to novel probes of dark matter: The observed Z^\ensuremath' boson mass will delineate a narrow range of allowed dark matter mass. If the Z^\ensuremath' boson decays to a pair of dark matter particles, a precise measurement of the invisible decay width can reveal the existence of the dark matter particle.