Stable, heavy, neutral particles in the sun and in toponium decay

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5018419

Griest, K E

In part I we consider the effects a cosmological asymmetry would have on various consequences of cold dark matter. To be specific, we suppose stable Dirac neutrinos exist with masses of a few GeV. We derive a formula which accurately predicts the relic abundance of particles and anti-particles and apply it to these neutrinos. We then find the number of these particles trapped in the sun and their self-annihilation rate. Finally, we find the signal the annihilation products give in a proton decay detector on Earth. We concentrate on the role asymmetry plays. We also do a careful calculation of the rate at which particles evaporate from the sun and find that if the neutrinos have masses of less than 3.0 GeV no signal can be seen. In part II we suggest a method of finding neutralinos at a toponium resonance in e{sup +}e{sup {minus}} collisions. We calculate the decay rate of the {sup 3}S{sub I} state of toponium into a photon and a pair of neutralinos as a function of the supersymmetric parameters. We also consider decay into a photon and a pair of neutrinos or sneutrinos. By detecting the photon the presence of the invisible pair can be inferred. Using a minimal supersymmetric extension of the Standard Model we find that an observable signal exists for most parameter values if the ratio of VEV's {nu}{sub 2}/{nu}{sub 1} is less than 0.3 or if a Higgs boson with mass less than the toponium mass exists. The known lower bound on the mass of the lightest chargino reduces somewhat the allowed parameter space. We also point out that for some values of parameters the Higgs bosons decay primarily into pairs of neutralinos. This has implications for Higgs searches in general.

• Research Organization: California Univ., Santa Cruz, CA (USA)
• OSTI ID: 5018419
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COSMOLOGICAL MODELS
ASYMMETRY
PHOTON COLLISIONS
NEUTRINO DETECTION
BOSONS
GEV RANGE 01-10
HIGGS MODEL
STANDARD MODEL
SUPERSYMMETRY
COLLISIONS
DETECTION
ENERGY RANGE
GEV RANGE
MATHEMATICAL MODELS
PARTICLE MODELS
RADIATION DETECTION
SYMMETRY
UNIFIED GAUGE MODELS
640106* - Astrophysics & Cosmology- Cosmology
645200 - High Energy Physics- Particle Interactions & Properties-Theoretical
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures