Parity violating asymmetries and weak neutral currents

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5194475

Tsao, T

The vector and axial couplings of leptons and quarks to the weak neutral current are studied by focusing on the parity violating asymmetries which arise in the following scattering processes; polarized-electron nucleon elastic collisions, dilepton production in polarized-proton proton scattering, polarized-electron positron annihilation into fermion pairs, and polarized-electron electron collisions. Numerical results are presented for the Weinberg-Salam model of electroweak interactions. It is found that at q/sup 2/ = 1 GeV/sup 2/, the parity violating asymmetries for elastic electron nucleon collisions are typically O(10/sup -5/) for proton, neutron, and deuteron targets. For dilepton production at presently available energies of s = 10/sup 3/ GeV/sup 2/, the parity violating asymmetries are O(10/sup -2/) while at much higher energies s = 6.4 x 10/sup 5/ GeV/sup 2/, the asymmetries are O(10/sup -1/). Electron positron annihilation into ..mu../sup +/..mu../sup -/, q anti q, and e/sup +/e/sup -/ give parity violating asymmetries that are typically O(10/sup -1/ to 1) for s near the Z/sup 0/ pole. Polarized-electron electron scattering yields parity violating asymmetries of O(10/sup -2/) at s approx. = to 10/sup 4/ GeV/sup 2/. The restrictions imposed on the parameters of the six-quark model by the neutral kaon system are discussed - with QCD effects included in the leading logarithmic approximation. The dependence of the CP violation parameter epsilon', the b-quark lifetime, and the ratio of decay widths GAMMA(b ..-->.. ux)/GAMMA(b ..-->.. cx) on the six-quark model parameters is also discussed.

• Research Organization: Stanford Univ., CA (USA)
• OSTI ID: 5194475
• Country of Publication: United States
• Language: English

Related Subjects

645202 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645203* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANNIHILATION
ASYMMETRY COEFFICIENTS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BEAMS
BOSONS
COMPOSITE MODELS
COUPLING
CURRENTS
DATA
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTRON-ELECTRON INTERACTIONS
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MESONS
NEUTRAL CURRENTS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
P INVARIANCE
PARTICLE INTERACTIONS
PARTICLE MODELS
POLARIZED BEAMS
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
QUARK MODEL
QUARKS
SCATTERING
STRANGE PARTICLES
THEORETICAL DATA
UNIFIED GAUGE MODELS
WEAK NEUTRAL CURRENTS
WEINBERG-SALAM GAUGE MODEL