منابع مشابه
The Qcd Vacuum as an Instanton Liquid
We review recent progress in understanding the importance of instanton effects in QCD. Instantons provide a mechanism for quark and gluon condensation, explain the U(1)A anomaly and the appearance of a non-perturbative vacuum energy density. In the framework of the instanton liquid model, a large number of hadronic correlation functions were calculated. The results are in good agreement with bo...
متن کاملPion distribution amplitudes within the instanton model of QCD vacuum
Pion transition form factor for the process γγ → π at space-like values of photon momenta is calculated within the effective quark-meson model with the interaction induced by instanton exchange. The leading and next-to-leading order power asymptotics of the form factor and the relation between the light-cone pion distribution amplitudes of twists 2 and 4 and the dynamically generated quark mass...
متن کاملVirtualities of Quarks and Gluons in Qcd Vacuum and Nonlocal Condensates within Single Instanton Approximation
We calculate the lowest-dimensional nonlocal quark and gluon condensates within the single instanton approximation of the instanton liquid model. As a result, we determine the values of average virtualities of quarks λq and gluons λ 2 g in the QCD vacuum and obtain parameterless predictions for the ratio λg/λ 2 q = 12/5, and for some ratios of different vacuum condensates of higher dimensions. ...
متن کاملInstanton Vacuum beyond Chiral Limit
In this talk it is discussed the derivation of low–frequencies part of quark determinant and partition function. As a first application, quark condensate is calculated beyond chiral limit with the account of O(m), O( 1 Nc ), O( 1 Nc m) and O( 1 Nc m lnm) corrections. It was demonstrated complete correspondence of the results to chiral perturbation theory. Introduction Instanton vacuum model ass...
متن کاملPion electromagnetic formfactor in the instanton vacuum
We have calculated the 3-point correlation function for the electromagnetic interaction of the pion in an ensembles of instantons and anti-instantons, modelling the QCD vacuum. The results are well described by a pion pole and the pion formfactor is extracted, nicely following a standard monopole fit. The experimental data on the formfactor are well reproduced, provided an average instanton siz...
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ژورنال
عنوان ژورنال: Zeitschrift für Physik C Particles and Fields
سال: 1991
ISSN: 0170-9739,1434-6052
DOI: 10.1007/bf01558571