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Title: Suppression of the neutralino relic density with supersymmetric CP violation

Abstract

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.

Authors:
 [1]
  1. Department of Physics, College of Science and Technology, Nihon University, 1-8-14, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308 (Japan)
Publication Date:
OSTI Identifier:
20776684
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.73.035005; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Nihei, Takeshi. Suppression of the neutralino relic density with supersymmetric CP violation. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.035005.
Nihei, Takeshi. Suppression of the neutralino relic density with supersymmetric CP violation. United States. doi:10.1103/PhysRevD.73.035005.
Nihei, Takeshi. Wed . "Suppression of the neutralino relic density with supersymmetric CP violation". United States. doi:10.1103/PhysRevD.73.035005.
@article{osti_20776684,
title = {Suppression of the neutralino relic density with supersymmetric CP violation},
author = {Nihei, Takeshi},
abstractNote = {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.},
doi = {10.1103/PhysRevD.73.035005},
journal = {Physical Review. D, Particles Fields},
number = 3,
volume = 73,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}