Two Loop Corrections to the Vacuum Polarizations in Perturbative QCD
Nov, 198919 pages
Published in:
- Nucl.Phys.B 347 (1990) 86-104
- Published: 1990
Report number:
- MAD/PH/539
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Abstract: (Elsevier)
Closed analytic expressions for the O( αα s ) corrections to the vacuum polarizations of neutral gauge bosons induced by a massive quark and to those of charged bossons associated with a quark isodoublet of large mass splitting are derived through dispersive methods for variable external invariant mass s . Their small- s , high- s and threshold expansions are calculated. As an application, the tb contributions in O( αα s ) to the radiative parameters Δϱ(0), Δr and the oblique correction δA LR to the left-right asymmetry A LR in e + e − collisions are studied. Handy approximation formulae for these corrections are presented which are valid for m t > M W and take into account the next-to-leading terms in M W / m t .- quantum chromodynamics: perturbation theory
- gauge boson: propagator
- vacuum polarization
- renormalization: regularization
- electroweak interaction: rho parameter
- rho parameter: electroweak interaction
- electron positron: annihilation
- annihilation: electron positron
- polarization: asymmetry
- asymmetry: polarization
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