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Title: Neutralino Dark Matter: Update on Direct and Indirect Detection

Abstract

Neutralinos represent a viable solution to the Dark Matter problem. In particular, while I discuss here a wide range for their masses, I will deserve a special attention to light neutralinos, which arise in supersymmetric models without unifications conditions of gaugino masses at the GUT scale. They have sizeable direct and indirect detection signals, which are bounded from below by the cosmological constraint on their relic abundance, but are not yet excluded by present direct and indirect searches, including limits coming from the BR(Bs {yields} {mu}+ + {mu}-) decay rate. They represent so an interesting experimental challenge. An intriguing aspect of light neutralinos is also that they could explain the DAMA modulation effect in a still existing compatibility window with other direct search experiments. I also discuss the gamma-ray signal from dark matter annihilation in our Galaxy and give some examples of external objects, namely the Andromeda Galaxy (M31) and M87. Predictions for the fluxes turn out to be below the level required to explain the possible indications of a {gamma}-ray excess shown by EGRET, CANGAROO-II and HESS (toward the Galactic Center) and HEGRA (from M87). As far as future experiments are concerned, only the signal from the galactic centermore » could be accessible to both satellite-borne experiments and to ACTs, even though this requires very steep dark matter density profiles.« less

Authors:
 [1]
  1. Korea Institute for Advanced Study 207-43 Cheongnyangni 2-dong, Dongdaemun-gu Seoul 130-722 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20729206
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 805; Journal Issue: 1; Conference: PASCOS 2005: 11. international symposium on particles, strings, and cosmology, Gyeongju (Korea, Republic of), 30 May - 4 Jun 2005; Other Information: DOI: 10.1063/1.2149745; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ABUNDANCE; ANNIHILATION; DENSITY; GAMMA RADIATION; MODULATION; NONLUMINOUS MATTER; PARTICLE DECAY; PARTICLE IDENTIFICATION; QUANTUM FIELD THEORY; REST MASS; SUPERSYMMETRY

Citation Formats

Scopel, S. Neutralino Dark Matter: Update on Direct and Indirect Detection. United States: N. p., 2005. Web. doi:10.1063/1.2149745.
Scopel, S. Neutralino Dark Matter: Update on Direct and Indirect Detection. United States. doi:10.1063/1.2149745.
Scopel, S. Fri . "Neutralino Dark Matter: Update on Direct and Indirect Detection". United States. doi:10.1063/1.2149745.
@article{osti_20729206,
title = {Neutralino Dark Matter: Update on Direct and Indirect Detection},
author = {Scopel, S.},
abstractNote = {Neutralinos represent a viable solution to the Dark Matter problem. In particular, while I discuss here a wide range for their masses, I will deserve a special attention to light neutralinos, which arise in supersymmetric models without unifications conditions of gaugino masses at the GUT scale. They have sizeable direct and indirect detection signals, which are bounded from below by the cosmological constraint on their relic abundance, but are not yet excluded by present direct and indirect searches, including limits coming from the BR(Bs {yields} {mu}+ + {mu}-) decay rate. They represent so an interesting experimental challenge. An intriguing aspect of light neutralinos is also that they could explain the DAMA modulation effect in a still existing compatibility window with other direct search experiments. I also discuss the gamma-ray signal from dark matter annihilation in our Galaxy and give some examples of external objects, namely the Andromeda Galaxy (M31) and M87. Predictions for the fluxes turn out to be below the level required to explain the possible indications of a {gamma}-ray excess shown by EGRET, CANGAROO-II and HESS (toward the Galactic Center) and HEGRA (from M87). As far as future experiments are concerned, only the signal from the galactic center could be accessible to both satellite-borne experiments and to ACTs, even though this requires very steep dark matter density profiles.},
doi = {10.1063/1.2149745},
journal = {AIP Conference Proceedings},
number = 1,
volume = 805,
place = {United States},
year = {Fri Dec 02 00:00:00 EST 2005},
month = {Fri Dec 02 00:00:00 EST 2005}
}
  • We investigate the detectability of neutralino dark matter via direct and indirect searches as well as collider signatures of an SO(10) model with two intermediate scales. We compare the direct dark matter detection cross section and the muon flux due to neutralino annihilation in the Sun that we obtain in this model with minimal supergravity predictions and with the sensitivity of current and future experiments. In both cases, we find that the detectability improves as the model deviates more from minimal supergravity. In order to study collider signatures, we choose two benchmark points that represent the main phenomenological features ofmore » the model: a lower value of |{mu}| and reduced third-generation sfermion masses due to extra Yukawa coupling contributions in the renormalization group equations and increased first- and second-generation slepton masses due to new gaugino loop contributions. We show that measurements at the LHC can distinguish this model from minimal supergravity in both cases, by counting events containing leptonically decaying Z{sup 0} bosons, heavy neutral Higgs bosons, or like-sign lepton pairs. The methods we develop can be used more generally to characterize models of weak-scale supersymmetry.« less
  • 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
  • Dark matter detection experiments are getting ever closer to the sensitivity needed to detect the primary particle physics candidates for nonbaryonic dark matter. In fact, some weak indications of possibly exotic signals already exist. Indirect detection methods include searching for antimatter and gamma rays, in particular gamma ray lines, in cosmic rays and high-energy neutrinos from the center of the Earth or Sun caused by accretion and annihilation of dark matter particles. A review is given of recent progress, both on the theoretical and experimental sides.
  • Dark matter candidates arising in models of particle physics incorporating weak scale supersymmetry may produce detectable signals through their annihilation into neutrinos, photons, or positrons. A large number of relevant experiments are planned or underway. The ''logically possible'' parameter space is unwieldy. By working in the framework of minimal supergravity, we can survey the implications of the experiments for each other, as well as for direct searches, collider searches, low-energy experiments, and naturalness in a transparent fashion. We find that a wide variety of experiments provide interesting probes. Particularly promising signals arise in the mixed gaugino-Higgsino region. This region ismore » favored by low-energy particle physics constraints and arises naturally from minimal supergravity due to the focus point mechanism. Indirect dark matter searches and traditional particle searches are highly complementary. In cosmologically preferred models, if there are charged superpartners with masses below 250 GeV, then some signature of supersymmetry must appear before the CERN LHC begins operation.« less
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