Speaker
Description
In this work, we investigate the ground states and their radial excitations which couple to scalar, axial vector and tensor, molecular and diquark-antidiquark currents via QCD sum rules. In operator product expansion, we considered quark, gluon and mixed condansates up to dimension eight. For the ground states coupling to these currents, we estimated degenerate masses within 10 MeV neighborhood of exotic meson X(4140) [1]. Thus, for the ground states, we concluded that, there may be three states degenerate in mass, with positive charge conjugation and different isospins. For the excited states, we found that scalar and tensor currents are coupling to D_s^ (D_s^ ) ̅ threshold. However for the axial vector currents, the first excited states found to have mass compatible with X(4274). Thus we conclude that, X(4274) might be the first radial excitation of X(4140) [2].
