X(3872), IG(JPC) = 0+(1++), as the χc1(2P) charmonium
Contrary to almost standard opinion that the X(3872) resonance is the D∗0D0 + c.c. molecule or the qcqc four-quark state, we discuss the scenario where the X(3872) resonance is the cc = χc1(2P) charmonium which “sits on” the D∗0D0 threshold. We explain 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(7872) 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. We predict a significant number of unknown decays of X(3872) via two gluon: X(3872) →gluon gluon →hadrons. We suggest a physically clear program of experimental researches for verification of our assumption.