B and B s decay constants from moments of finite energy sum rules in QCD F. Bodí-Esteban, J. Bordes and J. Peñarrocha Eur. Phys. J. C, 38 3 (2004) 277-281 Published online: 15 December 2004 DOI: 10.1140/epjc/s2004-02020-3