Parity violating weak neutral-current effects in elastic e-/sup 12/C scattering. Progress report, April 15, 1981-February 28, 1982

Technical Report · Mon Mar 01 04:00:00 EST 1982

OSTI ID:5231880

Lubell, M S

Unified gauge theories of the electro-weak interaction incorporate a neutral weak current, which, although many orders of magnitude smaller than the neutral-electromagnetic current, can be isolated through the manifestation of its parity violating effects. As a consequence, neutral current parity violation experiments provide direct access to the measurement of the weak coupling constants as well as fundamental tests of the unified theories. The verification of unified theories at low energies is a crucial prerequisite of the application of these theories to the range of higher energies where the W+- and the Z/sup 0/ are predicted to exist. One highly sensitive measurement of parity violation in the neutral current sector is provided by the determination of the asymmetry, A = (sigma/sup +/ - sigma/sup -/)/(sigma/sup +/ + sigma/sup -/), for elastic scattering of positive (+) and negative (-) helicity electrons from /sup 12/C nuclei. We have been pursuing such a program at the Bates Electron Accelerator with the goal of measuring A to a precision of approx. 10/sup -7/. By contrast, the standard model predicts a value for A of approx. 2 x 10/sup -6/.

• Research Organization: City Coll., New York (USA)
• DOE Contract Number: AC02-81ER40017
• OSTI ID: 5231880
• Report Number(s): DOE/ER/40017-3; ON: DE82014633
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
645302 -- High Energy Physics-- Particle Invariance Principles & Symmetries-- Applications to Electromagnetic & Weak Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
CARBON 12 TARGET
CURRENTS
ELASTIC SCATTERING
ELECTRON-NUCLEON INTERACTIONS
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
NEUTRAL CURRENTS
NUCLEAR MODELS
P INVARIANCE
PARTICLE INTERACTIONS
PARTICLE MODELS
SCATTERING
TARGETS
UNIFIED GAUGE MODELS
WEAK NEUTRAL CURRENTS
WEAK-COUPLING MODEL