1,721 research outputs found
Dispersive approach to QCD and hadronic contributions to electroweak observables
The dispersive approach to QCD is briefly overviewed and its application to
the assessment of hadronic contributions to electroweak observables is
discussed.Comment: Talk given at 12th International Conference on Quark Confinement and
the Hadron Spectrum, 29 August - 3 September 2016, Thessaloniki, Greece; 10
pages, 3 figure
New analytic running coupling in QCD: higher loop levels
The properties of the new analytic running coupling are investigated at the
higher loop levels. The expression for this invariant charge, independent of
the normalization point, is obtained by invoking the asymptotic freedom
condition. It is shown that at any loop level the relevant function has
the universal behaviors at small and large values of the invariant charge. Due
to this feature the new analytic running coupling possesses the universal
asymptotics both in the ultraviolet and infrared regions irrespective of the
loop level. The consistency of the model considered with the general definition
of the QCD invariant charge is shown.Comment: LaTeX 2.09, 12 pages with 5 EPS figures, uses mpla1.sty; enlarged
version is accepted for publication in Mod. Phys. Lett.
Inclusive tau lepton hadronic decay in the framework of dispersive approach to QCD
The dispersive approach to QCD and its applications to inclusive tau lepton
hadronic decay and hadronic vacuum polarization function are briefly discussed.Comment: Based on talks given at the 12th Workshop on Nonperturbative QCD (10
- 13 June 2013, Paris, France) and the 16th Lomonosov Conference on
Elementary Particle Physics (22 - 28 August 2013, Moscow, Russia); 4 pages, 1
figur
- …