A theoretical prediction of the Bs meson lifetime difference D. Becirevic, D. Meloni, A. Retico, V. Giménez, V. Lubicz and G. Martinelli Eur. Phys. J. C, 18 1 (2000) 157-166 Published online: 13 November 2000 DOI: 10.1007/s100520000502