$B_{s1}^{\ast }{B}^{\ast }K$ form factor from QCD sum rules

Abstract

In this article, we calculate the form factors and the coupling constant of the $g_{B_{s1}^{\ast }{B}^{\ast }K}$ vertex in the framework of the three-point QCD sum rules. Three point correlation functions responsible for the vertex are evaluated by considering both $B^{\ast }$ and $K$ mesons as off-shell states. The form factors obtained are different if the $B^{\ast }$ or the $K$ meson is off-shell but give the same coupling constant.

Comments: 12 pages, 6 figures. arXiv admin note: text overlap with arXiv:1009.5320 by other authors