1,115 research outputs found
Bogoliubov compensation approach in QCD and in the electroweak theory
We describe application of Bogoliubov compensation principle to calculation
of non-perturbative contribution in the electroweak theory and QCD. We obtain
unique solutions of compensation equations, which impose strong restrictions on
parameters of theories and on functional dependence of corresponding
form-factors. We calculate value of running gauge electroweak coupling
, that differs from the experimental value less than by
10%. We derive effective Nambu-Jona-Lasinio interaction from fundamental QCD
and express its parameters in terms of initial QCD parameters: at
low-momenta and current mass of light quarks. This leads to satisfactory
description of low-mass hadron physics.Comment: 6 pages, no figures, talk presented at the International Bogolyubov
Conference, August 21-27, 2009, Moscow-Dubna, Russi
Michel parameters in radiative muon decay
Radiative muon and tau lepton decays are described within the
model-independent approach with the help of generalized Michel parameters. The
exact dependence on charged lepton masses is taken into account. The results
are relevant for modern and future experiments on muon and tau lepton decays.Comment: 10 pages, typos are corrected, references are update
On higher order radiative corrections to elastic electron-proton scattering
QED radiative corrections to elastic electron-proton scattering at low
energies are discussed. Corrections to the electron line and effects due to
vacuum polarization are computed. Higher order effects are estimated for the
conditions of the experiment on the electric and magnetic proton form factors
by A1 Collaboration. Calculations are performed within the next-to-leading
approximation. Inclusion of the higher order effects can affect the value of
the proton charge radius extracted from the experimental data.Comment: 6 pages, 3 figure
- …