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Title: Light neutralino dark matter in the next-to-minimal supersymmetric standard model

Abstract

Neutralino dark matter is generally assumed to be relatively heavy, with a mass near the electroweak scale. This does not necessarily need to be the case, however. In the next-to-minimal supersymmetric standard model (NMSSM) and other supersymmetric models with an extended Higgs sector, a very light CP-odd Higgs boson can naturally arise making it possible for a very light neutralino to annihilate efficiently enough to avoid being overproduced in the early Universe. In this article, we explore the characteristics of a supersymmetric model needed to include a very light neutralino, 100 MeV<m{sub {chi}}{sub -tilde1{sup 0}}<20 GeV, using the NMSSM as a prototype. We discuss the most important constraints from Upsilon decays, b{yields}s{gamma}, B{sub s}{yields}{mu}{sup +}{mu}{sup -} and the magnetic moment of the muon, and find that a light bino or singlino neutralino is allowed, and can be generated with the appropriate relic density. It has previously been shown that the positive detection of dark matter claimed by the DAMA collaboration can be reconciled with other direct dark matter experiments such as CDMS II if the dark matter particle is rather light, between about 6 and 9 GeV. A singlino or binolike neutralino could easily fall within this range of massesmore » within the NMSSM. Additionally, models with sub-GeV neutralinos may be capable of generating the 511 keV gamma-ray emission observed from the galactic bulge by the INTEGRAL/SPI experiment. We also point out measurements which can be performed immediately at CLEO, BABAR, and Belle using existing data to discover or significantly constrain this scenario.« less

Authors:
;  [1];  [2]
  1. Department of Physics, University of California, Davis, California 95616 (United States)
  2. Department of Physics, Oxford University, Oxford OX1-3RH, United Kingdom and Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 (United States)
Publication Date:
OSTI Identifier:
20774640
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.73.015011; (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; B MESONS; CESR STORAGE RING; COSMOLOGY; CP INVARIANCE; GAMMA RADIATION; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; KEV RANGE; LEPTONIC DECAY; MAGNETIC MOMENTS; MEV RANGE; MULTIPARTICLE SPECTROMETERS; MUONS MINUS; MUONS PLUS; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; REST MASS; SPARTICLES; STANDARD MODEL; SUPERSYMMETRY

Citation Formats

Gunion, John F., McElrath, Bob, and Hooper, Dan. Light neutralino dark matter in the next-to-minimal supersymmetric standard model. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.015011.
Gunion, John F., McElrath, Bob, & Hooper, Dan. Light neutralino dark matter in the next-to-minimal supersymmetric standard model. United States. doi:10.1103/PhysRevD.73.015011.
Gunion, John F., McElrath, Bob, and Hooper, Dan. Sun . "Light neutralino dark matter in the next-to-minimal supersymmetric standard model". United States. doi:10.1103/PhysRevD.73.015011.
@article{osti_20774640,
title = {Light neutralino dark matter in the next-to-minimal supersymmetric standard model},
author = {Gunion, John F. and McElrath, Bob and Hooper, Dan},
abstractNote = {Neutralino dark matter is generally assumed to be relatively heavy, with a mass near the electroweak scale. This does not necessarily need to be the case, however. In the next-to-minimal supersymmetric standard model (NMSSM) and other supersymmetric models with an extended Higgs sector, a very light CP-odd Higgs boson can naturally arise making it possible for a very light neutralino to annihilate efficiently enough to avoid being overproduced in the early Universe. In this article, we explore the characteristics of a supersymmetric model needed to include a very light neutralino, 100 MeV<m{sub {chi}}{sub -tilde1{sup 0}}<20 GeV, using the NMSSM as a prototype. We discuss the most important constraints from Upsilon decays, b{yields}s{gamma}, B{sub s}{yields}{mu}{sup +}{mu}{sup -} and the magnetic moment of the muon, and find that a light bino or singlino neutralino is allowed, and can be generated with the appropriate relic density. It has previously been shown that the positive detection of dark matter claimed by the DAMA collaboration can be reconciled with other direct dark matter experiments such as CDMS II if the dark matter particle is rather light, between about 6 and 9 GeV. A singlino or binolike neutralino could easily fall within this range of masses within the NMSSM. Additionally, models with sub-GeV neutralinos may be capable of generating the 511 keV gamma-ray emission observed from the galactic bulge by the INTEGRAL/SPI experiment. We also point out measurements which can be performed immediately at CLEO, BABAR, and Belle using existing data to discover or significantly constrain this scenario.},
doi = {10.1103/PhysRevD.73.015011},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}