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The confinement mechanism proposed earlier by the author is employed for tocompute the decay constants $f_P$ corresponding to leptonic decays $P\tol^\pm+\nu_l$, $l=\mu, e$, where $P$ stands for any meson from $\pi^\pm$,$K^\pm$. For this aim the weak axial form factor of $P$-meson isnonperturbatively calculated. The study entails estimates for parameters of theconfining SU(3)-gluonic field in charged pions and kaons. The correspondingestimates of the gluon concentrations, electric and magnetic colour fieldstrengths are also adduced for the mentioned field at the scales of the mesonsunder consideration. Further the obtained results are applied to the problem ofchiral symmetry breaking in quantum chromodynamics (QCD). It is shown that inchirally symmetric world masses of pions and kaons are fully determined by theconfining SU(3)-gluonic field among (massless) $u$, $d$ and $s$ quarks and notequal to zero. Accordingly chiral symmetry is sufficiently rough approximateone holding true only when neglecting the mentioned SU(3)-gluonic field betweenquarks and no additional mechanism of the spontaneous chiral symmetry breakingconnected to the so-called Goldstone bosons is required. Finally, a possiblerelation of the results obtained with a phenomenological string-like picture ofconfinement is discussed too.

nuclear physics a

Estimates for parameters and characteristics of the confining  SU(3)-gluonic field in charged pions and kaons from leptonic decays and  chiral symmetry breaking