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Title: Theoretical and experimental review of the weak neutral current: a determination of its structure and limits on deviations from the minimal SU(2)/sub L/ x U(1) electroweak theory

Abstract

A detailed analysis of existing neutral-current data has been performed in order (a) to determine as fully as possible the structure of the hadronic and leptonic neutral currents without recourse to a specific weak-interaction model; (b) to search for the effects of small deviations from the Weinberg-Salam (WS-GIM) model; and (c) to determine the value of sin/sup 2/theta/sub w/ as accurately as possible. The authors attempt to incorporate the best possible theoretical expressions in the treatment of each of the reactions. For deep-inelastic scattering, for example, the effects of quantum chromodynamics, including the contributions of the s and c quarks, have been included. The sensitivity of the results both to systematic uncertainties in the data and to theoretical uncertainties in the treatment of deep-inelastic scattering, semi-inclusive pion production, ..nu.. elastic scattering from protons, and the asymmetry in polarized eD scattering have been considered; the systematic errors are generally found to be smaller than the statistical uncertainties. In the model-independent analyses the authors find that the hadronic neutral-current parameters are uniquely determined to lie within a small domain consistent with the WS-GIM model. The leptonic couplings are determined to within a twofold ambiguity; one solution, the axial-vector-dominant, is consistent with themore » WS-GIM model. If factorization is assumed then the axial-dominant solution is uniquely determined and null atomic parity violation experiments are inconsistent with other neutral-current experiments. Within generalized SU(2) x U(1) models we find the following limits on mixing between right-handed singlets and doublets: sin/sup 2/..cap alpha../sub u/< or =0.103, sin/sup 2/..cap alpha../sub d/< or =0.348, and sin/sup 2/..cap alpha../sub e/< or =0.064.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
OSTI Identifier:
6616240
DOE Contract Number:  
EY-76-02-3071
Resource Type:
Journal Article
Journal Name:
Rev. Mod. Phys.; (United States)
Additional Journal Information:
Journal Volume: 53:2
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; LEPTON-HADRON INTERACTIONS; NEUTRAL-CURRENT INTERACTIONS; WEAK NEUTRAL CURRENTS; REVIEWS; CABIBBO ANGLE; COUPLING CONSTANTS; DEEP INELASTIC SCATTERING; DISTRIBUTION FUNCTIONS; NEUTRINO-DEUTERON INTERACTIONS; P INVARIANCE; SEMI-INCLUSIVE INTERACTIONS; SU-2 GROUPS; U-1 GROUPS; WEINBERG-SALAM GAUGE MODEL; ALGEBRAIC CURRENTS; CURRENTS; DOCUMENT TYPES; FUNCTIONS; INCLUSIVE INTERACTIONS; INELASTIC SCATTERING; INTERACTIONS; INVARIANCE PRINCIPLES; LEPTON-BARYON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LIE GROUPS; MATHEMATICAL MODELS; NEUTRAL CURRENTS; PARTICLE INTERACTIONS; PARTICLE MODELS; SCATTERING; SU GROUPS; SYMMETRY GROUPS; U GROUPS; UNIFIED GAUGE MODELS; 645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; 645203 - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties

Citation Formats

Kim, J E, Langacker, P, Levine, M, and Williams, H H. Theoretical and experimental review of the weak neutral current: a determination of its structure and limits on deviations from the minimal SU(2)/sub L/ x U(1) electroweak theory. United States: N. p., 1981. Web. doi:10.1103/RevModPhys.53.211.
Kim, J E, Langacker, P, Levine, M, & Williams, H H. Theoretical and experimental review of the weak neutral current: a determination of its structure and limits on deviations from the minimal SU(2)/sub L/ x U(1) electroweak theory. United States. https://doi.org/10.1103/RevModPhys.53.211
Kim, J E, Langacker, P, Levine, M, and Williams, H H. 1981. "Theoretical and experimental review of the weak neutral current: a determination of its structure and limits on deviations from the minimal SU(2)/sub L/ x U(1) electroweak theory". United States. https://doi.org/10.1103/RevModPhys.53.211.
@article{osti_6616240,
title = {Theoretical and experimental review of the weak neutral current: a determination of its structure and limits on deviations from the minimal SU(2)/sub L/ x U(1) electroweak theory},
author = {Kim, J E and Langacker, P and Levine, M and Williams, H H},
abstractNote = {A detailed analysis of existing neutral-current data has been performed in order (a) to determine as fully as possible the structure of the hadronic and leptonic neutral currents without recourse to a specific weak-interaction model; (b) to search for the effects of small deviations from the Weinberg-Salam (WS-GIM) model; and (c) to determine the value of sin/sup 2/theta/sub w/ as accurately as possible. The authors attempt to incorporate the best possible theoretical expressions in the treatment of each of the reactions. For deep-inelastic scattering, for example, the effects of quantum chromodynamics, including the contributions of the s and c quarks, have been included. The sensitivity of the results both to systematic uncertainties in the data and to theoretical uncertainties in the treatment of deep-inelastic scattering, semi-inclusive pion production, ..nu.. elastic scattering from protons, and the asymmetry in polarized eD scattering have been considered; the systematic errors are generally found to be smaller than the statistical uncertainties. In the model-independent analyses the authors find that the hadronic neutral-current parameters are uniquely determined to lie within a small domain consistent with the WS-GIM model. The leptonic couplings are determined to within a twofold ambiguity; one solution, the axial-vector-dominant, is consistent with the WS-GIM model. If factorization is assumed then the axial-dominant solution is uniquely determined and null atomic parity violation experiments are inconsistent with other neutral-current experiments. Within generalized SU(2) x U(1) models we find the following limits on mixing between right-handed singlets and doublets: sin/sup 2/..cap alpha../sub u/< or =0.103, sin/sup 2/..cap alpha../sub d/< or =0.348, and sin/sup 2/..cap alpha../sub e/< or =0.064.},
doi = {10.1103/RevModPhys.53.211},
url = {https://www.osti.gov/biblio/6616240}, journal = {Rev. Mod. Phys.; (United States)},
number = ,
volume = 53:2,
place = {United States},
year = {Wed Apr 01 00:00:00 EST 1981},
month = {Wed Apr 01 00:00:00 EST 1981}
}