Lightest Higgs boson and relic neutralino in the MSSM with CP violation
- Center of Theoretical Physics, School of Physics, Seoul National University, Seoul, 151-747 (Korea, Republic of)
- Korea Institute for Advanced Study, Seoul 130-722 (Korea, Republic of)
We discuss the lower bound to the lightest Higgs boson H{sub 1} 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 B{sub s}{yields}{mu}{mu} decay favors a region of the parameter space where the mass of H{sub 1} is in the range 7 GeV < or approx. M{sub H{sub 1}} < or approx. 10 GeV, while 3 < or approx. tan{beta} < or approx. 5. Assuming a departure from the usual grand unified theory relation among gaugino masses (|M{sub 1}|<<|M{sub 2}|), we find that through resonant annihilation to H{sub 1} 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{sub {chi}}< or approx. M{sub H{sub 1/2}}. On the other hand, part of the range m{sub {chi}} > or approx. M{sub H{sub 1/2}} which is allowed by cosmology is excluded by antiproton fluxes.
- OSTI ID:
- 21020295
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 7; Other Information: DOI: 10.1103/PhysRevD.75.075001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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