Rare decays of Λ b →Λ γ and Λ b →Λ l + l − in universal extra-dimension model Yu-Ming Wang, M. Jamil Aslam and Cai-Dian Lü Eur. Phys. J. C, 59 4 (2009) 847-860 Published online: 20 December 2008 DOI: 10.1140/epjc/s10052-008-0835-8