Suppression of the neutralino relic density with supersymmetric CP violation

Journal Article · Wed Feb 01 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.035005· OSTI ID:20776684

Nihei, Takeshi ^[1]

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1. Department of Physics, College of Science and Technology, Nihon University, 1-8-14, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308 (Japan)

We study pair annihilations of the neutralino dark matter in the minimal supersymmetric standard model with CP violation. We consider the case that the Higgsino mass and the trilinear scalar couplings have CP-violating phases of order unity, taking a scenario that the scalar fermions in the first two generations are much heavier than those in the third generation to avoid a severe constraint from experimental limits on electric dipole moments. It is found that, when the lightest neutralino ({chi}) is binolike, the cross sections of the W-boson pair production {chi}{chi}{yields}W{sup +}W{sup -} and the lightest Higgs boson pair production {chi}{chi}{yields}H{sub 2}{sup 0}H{sub 2}{sup 0} for nonrelativistic neutralinos can be significantly enhanced by the phase of the Higgsino mass. The relic density of the neutralino can be considerably suppressed by this effect. However, even this suppression is not enough to make binolike dark matter consistent with a cosmological constraint. We also discuss the effect of CP violation on the positron flux from neutralino pair annihilations in the galactic halo.

• OSTI ID: 20776684
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 73; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
COUPLING
CP INVARIANCE
CROSS SECTIONS
DENSITY
ELECTRIC DIPOLE MOMENTS
HIGGS BOSONS
NONLUMINOUS MATTER
PAIR PRODUCTION
POSITRONS
REST MASS
SCALARS
STANDARD MODEL
SUPERSYMMETRY
W MINUS BOSONS
W PLUS BOSONS