$D^* D_s K$ and $D_s ^* D K$ vertices in a QCD Sum Rule approach

Details $D^* D_s K$ and $D_s ^* D K$ vertices in a QCD Sum Rule approach $D^* D_s K$ and $D_s ^* D K$ vertices in a QCD Sum Rule approach

2006-04-19

arxiv.org/abs/hep-ph/0604167v1

Phys.Lett.B641:286-293,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 8 figures. Submitted to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.08.058

We calculate the strong form factors and coupling constants of $ D^* D_s K$ and $D_s^* D K$ vertices using the QCD sum rules technique. In each case we have considered two different cases for the off-shell particle in the vertex: the ligthest meson and one of the heavy mesons. The method gives the same coupling constant for each vertex. When the results for different vertices are compared, they show that the SU(4) symmetry is broken by around 40%.

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