The gDsDsϕ strong coupling constant from QCD Sum Rules

The form factors and coupling constant of the strong meson vertex DsDsϕ were calculated within the QCD Sum Rules formalism using three point correlation functions. Mesons ϕ and Ds were considered alternately off-shell, obtaining two different form factors and the value of coupling constant for the vertex gDsDsϕ is obtained as 1.98−0.33+0.51. This value should be useful in studies related to the decays of recently reported exotic states, like Y(4140) and X(4350).