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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}
}
  • We explore the prospects for indirect detection of neutralino dark matter in supersymmetric models with an extended Higgs sector (next-to-minimal supersymmetric standard model, or NMSSM). We compute, for the first time, one-loop amplitudes for NMSSM neutralino pair annihilation into two photons and two gluons, and point out that extra diagrams (with respect to the minimal supersymmetric standard model, or MSSM), featuring a potentially light CP-odd Higgs boson exchange, can strongly enhance these radiative modes. Expected signals in neutrino telescopes due to the annihilation of relic neutralinos in the Sun and in the Earth are evaluated, as well as the prospectsmore » of detection of a neutralino annihilation signal in space-based gamma-ray, antiproton and positron search experiments, and at low-energy antideuteron searches. We find that in the low mass regime the signals from capture in the Earth are enhanced compared to the MSSM, and that NMSSM neutralinos have a remote possibility of affecting solar dynamics. Also, antimatter experiments are an excellent probe of galactic NMSSM dark matter. We also find enhanced two-photon decay modes that make the possibility of the detection of a monochromatic gamma-ray line within the NMSSM more promising than in the MSSM, although likely below the sensitivity of next generation gamma-ray telescopes.« less
  • We study the neutralino relic density in the minimal supersymmetric standard model with natural light Higgs sector in which all Higgs masses, the supersymmetry (SUSY) breaking parameters, and the Higgsino mass parameter {mu} are of order the weak scale. To realize this situation we adopt nonuniversal Higgs masses at the grand unified scale. We show that in some parameter space in which the SUSY breaking parameters are comparatively small, not only the constraint from the observed relic density of dark matter but also the LEP Higgs bound and the constraint from the b{yields}s{gamma} process are satisfied. In most of themore » parameter space, the neutralino relic density becomes smaller than the observed relic density in contrast with the results in the constrained minimal SUSY standard model (CMSSM). The reason is that the neutralino coannihilation processes to Higgs bosons open even if the gaugino mass is small and the cross sections become large due to the small dimensionful parameters. Especially the small {mu} parameter and the light CP-odd Higgs, which are difficult to be realized in the CMSSM, are essential for the result.« less
  • We revisit the one-loop calculation of the annihilation of a pair of the lightest neutralinos into a pair of photons, a pair of gluons and also a Z photon final state. For the latter we have identified a new contribution that may not always be negligible. For all three processes we have conducted a tuned comparison with previous calculations for some characteristic scenarios. The approach to the very heavy Higgsino and W-ino is studied and we argue how the full one-loop calculation should be matched into a more complete treatment that was presented recently for these extreme regimes. We alsomore » give a short description of the code that we exploited for the automatic calculation of one-loop cross sections in the minimal supersymmetric model that could apply, both for observables at the colliders and for astrophysics or relic density calculations. In particular, the automatic treatment of zero Gram determinants which appear in the latter applications is outlined. We also point out how generalized nonlinear gauge-fixing constraints can be exploited.« less
  • An analysis of spin independent neutralino-proton cross sections {sigma}{sub SI}({chi}p) that includes this low mass region is given. The analysis is done in minimal supersymmetric standard model (MSSM) with radiative electroweak symmetry breaking (REWSB). It is found that cross sections as large as 10{sup -40} cm{sup 2} can be accommodated in MSSM within the REWSB framework. However, inclusion of sparticle mass limits from current experiments, as well as lower limits on the Higgs searches from the Tevatron, and the current experimental upper limit on B{sub s{yields}{mu}}{sup +{mu}-} significantly limit the allowed parameter space reducing {sigma}{sub SI}({chi}p) to lie below {approx}10{supmore » -41} cm{sup 2} or even lower for neutralino masses around 10 GeV. These cross sections are an order of magnitude lower than the cross sections needed to explain the reported data in the recent dark matter experiments in the low neutralino mass region.« less
  • We reexamine the prospects for the detection of Higgs-mediated lepton flavor violation at LHC, at a photon collider and in {tau} decays such as {tau}{yields}{mu}{eta}, {tau}{yields}{mu}{gamma}. We allow for the presence of a large, model independent, source of lepton flavor violation in the slepton mass matrix in the {tau}-{mu} sector by the mass insertion approximation and constrain the parameter space using the {tau} lepton flavor violating decays together with the B-mesons physics observables, the anomalous magnetic moment of the muon, and the dark matter relic density. We further impose the exclusion limit on spin-independent neutralino-nucleon scattering from CDMS and themore » CDF limits from direct search of the heavy neutral Higgs at the TEVATRON. We find rates probably too small to be observed at future experiments if models have to accommodate for the relic density measured by WMAP and explain the (g-2){sub {mu}}anomaly: better prospects are found if these two constraints are applied only as upper bounds. The spin-independent neutralino-nucleon cross section in the studied constrained parameter space is just below the present CDMS limit and the running XENON100 experiment will cover the region of the parameter space where the lightest neutralino has large gaugino-Higgsino mixing.« less