Natural conservation laws for neutral currents. [Su(2)xU(1) gauge theory]

Journal Article · Fri Apr 01 00:00:00 EST 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.15.1958· OSTI ID:7304569

Glashow, S L; Weinberg, S

We explore the consequences of the assumption that the direct and induced weak neutral currents in an SU(2) x U(1) gauge theory conserve all quark flavors naturally, i.e., for all values of the parameters of the theory. This requires that all quarks of a given charge and helicity must have the same values of weak T/sub 3/ and T/sup 2/. If all quarks have charge +2/3 or -1/3 the only acceptable theories are the ''standard'' and ''pure vector'' models, or their generalizations to six or more quarks. In addition, there are severe constraints on the couplings of Higgs bosons, which apparently cannot be satisfied in pure vector models. We also consider the possibility that neutral currents conserve strangeness but not charm. A natural seven-quark model of this sort is described. The experimental consequences of charm nonconservation in direct or induced neutral currents are found to be quite dramatic.

• Research Organization: Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138
• OSTI ID: 7304569
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 15:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645302* -- High Energy Physics-- Particle Invariance Principles & Symmetries-- Applications to Electromagnetic & Weak Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
CHARM PARTICLES
COMPOSITE MODELS
CONSERVATION LAWS
CURRENTS
EIGENVALUES
ELEMENTARY PARTICLES
GAUGE INVARIANCE
HIGGS MODEL
INVARIANCE PRINCIPLES
LIE GROUPS
MATHEMATICAL MODELS
NEUTRAL CURRENTS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
QUARK MODEL
STRANGENESS
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS
VACUUM STATES
WEAK NEUTRAL CURRENTS