2007/01/26 by Jae Sik Lee, Stefano Scopel, S. Scopel
Physics and Astronomy · #Black Holes and Theoretical Physics #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.75.075001
published as Phys.Rev.D75:075001,2007 · 16 pages, 6 figures
arxiv created 2007/01/26 · openalex publication_date 2007/04/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We discuss the lower bound to the lightest Higgs boson H1 in the minimal supersymmetric extension of the standard model with explicit CP violation, and the phenomenology of the lightest relic neutralino in the same scenario. In particular, adopting the CPX benchmark scenario, we find that the combination of experimental constraints coming from LEP, thallium electric dipole moment measurements, quarkonium decays, and Bs\ensuremath→\ensuremathμ\ensuremathμ decay favors a region of the parameter space where the mass of H1 is in the range 7 GeV\ensuremath\lesssimM_H1\ensuremath\lesssim10 GeV, while 3\ensuremath\lesssimtan\ensuremathβ\ensuremath\lesssim5. Assuming a departure from the usual grand unified theory relation among gaugino masses (|M1|\ensuremath≪|M2|), we find that through resonant annihilation to H1 a neutralino as light as 2.9 GeV can be a viable dark matter candidate in this scenario. We call this the CPX light neutralino scenario and discuss its phenomenology showing that indirect dark matter searches are compatible with the present experimental constraints, as long as m_\ensuremathχ\ensuremath\lesssimM_H1/2. On the other hand, part of the range m_\ensuremathχ\ensuremath\gtrsimM_H1/2 which is allowed by cosmology is excluded by antiproton fluxes.