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Achasov","submitted_at":"2015-01-15T06:03:53Z","abstract_excerpt":"Contrary to almost standard opinion that the X(3872) resonance is the D^{*0}\\bar D^0+c.c. molecule or the qc\\bar q\\bar c four-quark state, we discuss the scenario where the X(3872)resonance is the c\\bar c = \\chi_{c1}(2P) charmonium which \"sits on\" the D^{*0}\\bar D^0 threshold.\n  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 \\chi_{c1}(2P) charmonium by the contribution of the virtual D^*\\bar D+c.c. intermediate states into the self energy of the X(3872) resonance. 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