Spontaneous compactification effects, low-energy signature of quark-lepton unification, and small neutrino masses in SO(10)
Signatures of quark-lepton unification can be experimentally verified by rare-kaon-decay processes provided the SU(4)/sub C/-breaking scale M/sub C//similar to/10/sup 5/--10/sup 6/ GeV. With the single intermediate symmetry, SU(2)/sub L/ x U(1)/sub R/ x SU(4)/sub C/ in SO(10), we find, for the first time, that such a scale and small Majorana neutrino masses are allowed when gravity-induced corrections due to a five-dimensional operator, arising out of spontaneous compactification of extra dimensions, are included. For such lower values of M/sub C/, the predicted proton lifetime is large depending upon the value of sin/sup 2/theta/sub W/ in the range 0.22--0.24. For still larger values of M/sub C/, neutrino masses and proton lifetime decrease, and the latter saturates the Irvine-Michigan-Brookhaven limit when M/sub C//similar to/10/sup 11/--10/sup 12/ GeV.
- Research Organization:
- Physics Department, North-Eastern Hill University, Bijni Complex, Laitumkhrah, Shillong 793003, India
- OSTI ID:
- 6447539
- Journal Information:
- Phys. Rev. D; (United States), Vol. 39:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
KALUZA-KLEIN THEORY
COMPACTIFICATION
NEUTRINOS
MASS
PROTONS
DECAY
GRAND UNIFIED THEORY
LEPTONS
LIFETIME
QUARKS
SO-10 GROUPS
SU-2 GROUPS
SU-4 GROUPS
SYMMETRY BREAKING
U-1 GROUPS
BARYONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
LIE GROUPS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NUCLEONS
PARTICLE MODELS
POSTULATED PARTICLES
SO GROUPS
SU GROUPS
SYMMETRY GROUPS
U GROUPS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
645400* - High Energy Physics- Field Theory
645203 - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties