Eur. Phys. J. Plus (2013) 128: 113
https://doi.org/10.1140/epjp/i2013-13113-2

Regular Article

Investigation of the D _s ^* D_s η ^(′) and B _s ^* B_s η ^(′) vertices via QCD sum rules

¹ Department of Physics, Kocaeli University, 41380, Izmit, Turkey
² Physics Department, Faculty of Arts and Sciences, Doğuş University, Acıbadem-Kadıköy, 34722, Istanbul, Turkey

^* e-mail: enis.yazici@kocaeli.edu.tr

Received: 16 August 2013
Accepted: 24 September 2013
Published online: 14 October 2013

Abstract

The strong-coupling constants among mesons are very important quantities as they can provide useful information on the nature of strong interaction among hadrons as well as the QCD vacuum. In this article, we investigate the strong vertices of the D _s ^* D _s η ^(′) and B _s ^* B _s η ^(′) in the framework of the QCD sum rule approach choosing the η or D _s (B _s ) meson as an off-shell state. We obtain the results , , and for the strong-coupling constants under consideration, which can be checked in future experiments.