Parity-violating weak neutral current effects in elastic e-/sup 12/C scattering. Progress report, March 1, 1982-December 31, 1982

Technical Report · Sun Jan 30 23:00:00 EST 1983

DOI:https://doi.org/10.2172/6556461· OSTI ID:6556461

Lubell, M. S.

As a means of investigating unified gauge theories of the electro-weak interaction we have been preparing an experiment for the Bates Electron Accelerator to determine the parity violating asymmetry A = (sigma/sub R/ - sigma/sub L/) for 30/sup 0/ elastic scattering by /sup 12/C of 250 MeV longitudinally polarized electrons, where sigma/sub R/ and sigma/sub L/ are respectively the differential cross sections for electrons with right and left helicities. The asymmetry depends strictly on the isoscalar vector-hadronic coupling constant, and in terms of the Weinberg-Salam model is predicted to have a value of approx. 2 x 10/sup -6/ for our choice of kinematics. Central to the success of the measurement of such a small quantity is the use of an intense, highly stable source of polarized electrons. The progress in the development of such a source, based upon photoemission from GaAs, is reviewed in this report.

• Research Organization: City Coll., New York (USA)
• DOE Contract Number: AC02-81ER40017
• OSTI ID: 6556461
• Report Number(s): DOE/ER/40017-5; ON: DE83007422
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGEBRAIC CURRENTS
ASYMMETRY
BASIC INTERACTIONS
BEAMS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COUPLING CONSTANTS
CROSS SECTIONS
CURRENTS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTRON REACTIONS
ELECTRON SOURCES
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON REACTIONS
MATHEMATICAL MODELS
NEUTRAL CURRENTS
NUCLEAR REACTIONS
P INVARIANCE
PARTICLE MODELS
PARTICLE SOURCES
POLARIZED BEAMS
RADIATION SOURCES
SCATTERING
TARGETS
UNIFIED GAUGE MODELS
WEAK INTERACTIONS
WEAK NEUTRAL CURRENTS
WEINBERG-SALAM GAUGE MODEL