Pseudo-Dirac bino dark matter

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.015004· OSTI ID:21035740

Hsieh, Ken ^[1]

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1. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States) and Department of Physics, Michigan State University, East Lansing, Michigan 48824 (United States)

While the bino-dominated lightest neutralino of the minimal supersymmetric standard model (MSSM) is an interesting and widely studied candidate of dark matter, the p-wave suppression of its annihilation cross section requires fine-tuning of the MSSM spectra to be consistent with Wilkinson Microwave Anisotropy Probe (WMAP) observations. We propose a pseudo-Dirac bino that arises in theories with D-type supersymmetry breaking as an intriguing alternative candidate of dark matter. The pseudo-Dirac nature of the bino gives a natural mechanism of enhanced coannihilation because these two states are degenerate in the absence of electroweak symmetry breaking. In addition, the lightest state can be consistent with limits of direct-detection experiments because of the lack of vector interactions, as with the case of the MSSM bino.

• OSTI ID: 21035740
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
CROSS SECTIONS
NONLUMINOUS MATTER
P WAVES
PARTICLE IDENTIFICATION
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
SYMMETRY BREAKING