Constraints on proton lifetime and sin/sup 2/theta/sub W/ in SO(10) grand unified theory

Journal Article · Sat Oct 01 00:00:00 EDT 1983 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.28.1731· OSTI ID:5374797

Tosa, Y; Branco, G C; Marshak, R E

Simple constraints on the proton-decay lifetime are derived in SO(10) grand unified theory for major descents to the standard group SU(3)/sub C/ x SU(2)/sub L/ x U(1)/sub Y/. It is shown that the only unambiguous pattern of symmetry breaking that predicts a longer proton lifetime (than SU(5)) goes through the Pati-Salam group SU(4) x SU(2)/sub L/ x SU(2)/sub R/ and distinguishes quarks from leptons (i.e., SU(4) breaks down to SU(3)/sub C/ x U(1)/sub B/-L) before parity is broken (i.e., SU(2)/sub R/ is broken). The lifetime depends on M/sub R/ (the mass scale associated with SU(2)/sub R/ breaking) but neither on the other intermediate mass scales nor on sin/sup 2/theta/sub W/ in the limit where Higgs-boson contributions are neglected.

• Research Organization: Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
• OSTI ID: 5374797
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Journal Issue: 7 Vol. 28:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

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
BARYONS
BOSONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
HIGGS BOSONS
INTERMEDIATE BOSONS
LEPTONS
LIE GROUPS
LIFETIME
MATHEMATICAL MODELS
NUCLEONS
PARITY
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
RENORMALIZATION
SO GROUPS
SU GROUPS
SU-2 GROUPS
SU-3 GROUPS
SYMMETRY BREAKING
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS
UNIFIED GAUGE MODELS