Towards the nature of X(3872) resonance

The spectra of decays of resonance X(3872) with good analytical and unitary properties are constructed, which allows to define the branching ratio of the X(3872)→D*0D0+c.c. decay by studying only one more decay, for example, the X(3872)→π+π-J/ψ(1S) decay, and it is shown that the spectra are an effective means of selection of models for the resonance X(3872). Then the scenario is discussed where the X(3872) resonance is the c=χc1(2P) charmonium which “sits on” the D*0D0 threshold. An explanation is given of the shift of the mass of the X(3872) resonance with respect to the prediction of a potential model for the mass of the χc1(2P) charmonium by the contribution of the virtual D*D+c.c. intermediate states into the self energy of the X(3872) resonance. This allows us to estimate the coupling constant of the X(3872) resonance with the D*0D0 channel, the branching ratio of the X(3872)→D*0D0+c.c. decay, and the branching ratio of the X(3872) decay into all non-D*0D0+c.c. states. A significant number of unknown decays of X(3872) via two gluons: X(3872)→gluon gluon→hadrons are predicted.