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Observable consequences of SO(10) unified theories

Thesis/Dissertation ·
OSTI ID:6349200
A class of SO(10) grand unified theories with interesting consequences is investigated. Specific features of the model include 1) the neutrinos are massless; 2) there is a second neutral electroweak gauge boson (Z/sub 2/) which is accessible to the present generation of accelerators; and 3) for each generation there corresponds a neutral lepton with a Dirac mass allowed to be in the GeV range. An interesting result is that the parity-violating electron-nucleon and electron-muon neutral current couplings at low momentum transfer are identical to those in the standard model. The largest deviation comes from neutrino-hadron couplings from which a lower bound for the Z/sub 2/ mass is obtained: M/sub 2/ approx.> (2.1 - 2.5) M/sub 0/, where M/sub 0/ is the mass of the neutral weak gauge boson (Z/sub 0/) in the standard model. The mass of the lighter neutral boson (Z/sub 1/) lies within 1.5% of that of the standard Z/sub 0/:0.985 less than or equal to M/sub 1//M/sub 0/ less than or equal to 1. Effects of the Z/sub 2/ in neutral current interactions are examined, the decay widths and branching ratios of the Z's are calculated, and the prospects for producing them in high energy pp and anti-pp collisions are studied. The phenomenology of the massive neutral leptons is then discussed. The existence of massive neutral leptons introduces violations of weak universality from which lower bounds on their masses are obtained. The prospects for observing the massive neutral leptons in neutrino neutral current interactions, in W and Z decays, and in tau, c, and b decays are examined.
Research Organization:
Minnesota Univ., Minneapolis (USA)
OSTI ID:
6349200
Country of Publication:
United States
Language:
English

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Related Subjects

645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BOSONS
BRANCHING RATIO
DATA
DECAY
ELECTRON-MUON INTERACTIONS
ELECTRON-NUCLEON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
HADRON-HADRON INTERACTIONS
HEAVY LEPTONS
INFORMATION
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INVARIANCE PRINCIPLES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
LIE GROUPS
MASS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRAL-CURRENT INTERACTIONS
NEUTRINOS
NUCLEON-ANTINUCLEON INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
P INVARIANCE
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE WIDTHS
POSTULATED PARTICLES
PROTON-ANTIPROTON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
REST MASS
SO GROUPS
SYMMETRY GROUPS
THEORETICAL DATA
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
WEAK PARTICLE DECAY