Semileptonic decays of B s1, B s2 * , B s0 and B s1′ Zhi-Gang Luo, Xiao-Lin Chen, Xiang Liu and Shi-Lin Zhu Eur. Phys. J. C, 60 3 (2009) 403-411 Published online: 28 February 2009 DOI: 10.1140/epjc/s10052-009-0940-3