A QCD sum rules calculation of the J/psi D-s*D-s strong coupling constant

作者：Rodrigues Bruno Osorio^*; Bracco Mirian Enriqueta; Chiapparini Marcelo; Cerqueira Angelo Jr

来源：European Physical Journal A, 2015, 51(3): 28.

DOI：10.1140/epja/i2015-15028-9

In this work, we calculate the form factors and the coupling constant of the strange-charmed vertex J/psi D-s*D-s in the framework of the QCD sum rules by studying their three-point correlation functions. All the possible off-shell cases are considered, Ds, D-s* and J/psi, resulting in three different form factors. These form factors are extrapolated to the pole of their respective off-shell mesons, giving the same coupling constant for the process. Our final result for the J/psi D-s* D-s coupling constant is gJ psi D-s*D-s = 4.30(-1.22)(+1.53) GeV-1.

• 出版日期2015-3-6