The modern status of basic low energy QCD parameters is reviewed. It is demonstrated that
the recent data allow one to determine the light quark mass ratios with an accuracy of 10 …

The aim of the book is to give an introduction to the method of QCD Spectral Sum Rules and
to review its developments. After some general introductory remarks, Chiral Symmetry, the …

The total τ hadronic width can be accurately calculated using analyticity and the operator
product expansion. The theoretical analysis of this observable is updated to include all …

We use QCD spectral sum rules to test the nature of the meson X (3872), assumed to be an
exotic four-quark (cc¯ qq¯) state with J PC= 1++. For definiteness, we work with the diquark …

Based on an effective Lagrangian which combines chiral SU (3) dynamics with vector
meson dominance, we have developed a model for the forward vector meson-nucleon …

This 2004 book provides a pedagogical introduction to the perturbative and non-perturbative
aspects of quantum chromodynamics (QCD). The text introduces the basic theory of QCD …

Charmonium sum rules are analyzed with the primary goal to obtain the restrictions on the
value of the dimension 4 gluon condensate. The moments M n (Q 2) of the polarization …

Using the PDG 22 compilation of the e+ e−→ Hadrons⊕ the recent CMD3 data for the pion
form factor and the value of gluon condensate< α s G 2> from heavy quarkonia, we extract …

This book is devoted to some recently developed techniques in quantum field theory (QFT),
as well as to their main applications to different areas of parti cle physics. All together they …

Matrix elements of four-quark operators are studied with two approaches. First inclusively:
we consider two-point functions of four-quark operators. We compute their corresponding …