TY - RPRT
TI - Dispersion relations for vacuum-polarization functions in electroweak physics
AB - We propose a class of once-subtracted dispersion relations for the vacuum-polarization functions of massive fermions, in which the subtraction constants are determined explicitly from Ward indentities. We show that in perturbation theory to O({alpha}) and O({alpha}{alpha}{sub s}) this approach, the alternative dispersion relations proposed by Chang, Gaemers, and van Neerven, and dimensional regularization all give the same contributions to electroweak observables such as {Delta}{rho} and {Delta}{rho}. The threshold behaviours of the subtraction integrands are, however, very different and the two dispersion methods are expected to lead to significantly variant estimates of contributions arising form non-perturbative tanti t threshold effects. (orig.).
AU - Kniehl, B A [Wisconsin Univ., Madison, WI (United States). Dept. of Physics]
AU - [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)]
AU - Sirlin, A [New York Univ., NY (United States). Dept. of Physics]
KW - 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
KW - WEINBERG LEPTON MODEL
KW - VACUUM POLARIZATION
KW - FERMIONS
KW - PERTURBATION THEORY
KW - WARD IDENTITY
KW - DISPERSION RELATIONS
KW - QUANTUM ELECTRODYNAMICS
KW - QUANTUM CHROMODYNAMICS
KW - REST MASS
KW - RENORMALIZATION
KW - RADIATIVE CORRECTIONS
KW - FUNCTIONS
KW - 662210
KW - UNIFIED THEORIES AND MODELS
DO -
UR -
PB -
CY - Germany
PY - 1991
DA - 1991-09-01
LA - English
J2 -
C1 - Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
C2 -
ER -