(π+π-)-diseatom, epsilon-meson mass and ππ-scattering lengths

It is shown that in the superconductive quark model (quark-loop model) the epsilon-meson mass completely defines the value of the chiral-symmetry-breaking parameter β. Since the definition of the (π+π-)-dimesoatom lifetime gives a unique possibility of a direct measurement of the value of parameter β, this, in turn, results in the possibility of a more correct definition of the epsilon-meson mass that presently lies in a broad interval from 700 MeV to 800 MeV. The choice of a definite value of the epsilon-meson mass permits us to define the ππ-scattering lengths more exactly